CN215420247U - Digital multi-channel signal far-end frequency conversion device - Google Patents

Digital multi-channel signal far-end frequency conversion device Download PDF

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CN215420247U
CN215420247U CN202121811355.0U CN202121811355U CN215420247U CN 215420247 U CN215420247 U CN 215420247U CN 202121811355 U CN202121811355 U CN 202121811355U CN 215420247 U CN215420247 U CN 215420247U
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coaxial
antenna side
antenna
digital
output end
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周强
杨宝义
刘光华
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Beijing Kaibo Wireless Technology Co ltd
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Beijing Kaibo Wireless Technology Co ltd
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Abstract

The present invention relates to communication technology. The utility model aims to provide a digital multichannel signal far-end frequency conversion device, which can solve the problem caused by the adoption of an analog mode of a far-end frequency conversion unit after corresponding digital processing software is added, and the technical scheme of the digital multichannel signal far-end frequency conversion device can be summarized as follows: the FDM combiner/divider comprises an FDM combiner/divider, a coaxial port, at least two antennas and communication channels with the same number as the antennas, and the FDM combiner/divider comprises a coaxial-side duplexer, a coaxial-side downlink channel, a coaxial-side uplink channel, a digital processing module, an antenna-side downlink channel, an antenna-side uplink channel and an antenna-side duplexer aiming at any communication channel. The utility model has the advantages of flexibility, convenience and improved performance brought by the digitization of the far-end frequency conversion unit, and is suitable for the far-end frequency conversion unit.

Description

Digital multi-channel signal far-end frequency conversion device
Technical Field
The present invention relates to a communication technology, and in particular, to a technology of a remote device in a scenario where a mobile base station pulls an antenna unit away by using a coaxial cable.
Background
Patent No. 201911236246.8 discloses a signal transmission system and a signal transmission method, which use frequency division multiplexing, and can utilize the existing coaxial DAS (distributed antenna system) or the existing cable television coaxial network to realize the deep coverage of wireless mobile communication signals, especially 5G signals, to the indoor environment, and can realize the MIMO function on the so-called "single line" coaxial. The system comprises a near-end main unit (MU device) and a far-end frequency conversion unit (FCU device), wherein the MU device and the FCU device are connected through a DAS or cable television coaxial network, and the MU device can be connected with a plurality of FCU devices. In reference to fig. 6 in the specification, an embodiment of a remote frequency conversion unit implemented in an analog frequency conversion manner is disclosed, which is a schematic structural diagram of a remote frequency conversion unit FCU of the patent, and supports m transmission channels and m reception channels, and functions of the remote frequency conversion unit FCU are as follows: for the downlink direction (left to right in the figure), a set of frequency division multiplexing intermediate frequency downlink combined signals Σ (S) transmitted from the near-end master unit MU device are first received from the coaxial portIF1-DL，SIF2-DL，...， SIFm-DL) In the FCU, the FDM (frequency division multiplexing) combiner/splitter located on the coaxial side transmits the intermediate frequency downstream signal S of the respective channel thereinIFi-DL(i is channel number; i is 1, 2.. multidot.m) is separated out, amplified and mixed, and converted into radio frequency specified by operator and radio frequency downlink signal S on the channel(RF-DL)i(i is a channel number; i is 1, 2.. multidot.m) and is transmitted to the space via the antenna units of the respective channels; in the uplink direction (from right to left in the figure), the radio frequency uplink signals S received by the antenna units of the respective channels are transmitted(RF-UL)i(i is channel number; i is 1, 2.. multidot.m), after amplification and mixing, the signals are converted into intermediate frequency uplink signals S with different frequencies corresponding to the channels in the frequency division multiplexing intermediate frequency uplink combined signal groupIFi-UL(i is a channel number; i is 1, 2.. m.) and a complete frequency division multiplexing intermediate frequency uplink combined signal sigma (S) is formed by the combining device (i.e. the FDM combiner/splitter)IF1-UL，SIF2-UL，...，SIFm-UL) To the coaxial system and received by the MU at the near end.
For the combination of the uplink and downlink of each channel, a corresponding duplexer is needed, and for FDD (frequency division duplex), the duplexer is generally made of a pair of filters; for TDD (time division duplex), the duplexer is made of electronic switches. When the system is operating in FDD mode, the intermediate frequency f of each channelIFi-DL≠fIFi-UL(i ═ 1, 2,... m), radio frequency fRF-DL≠fRF-UL(ii) a When the system works in TDD mode, the intermediate frequency f of each channelIFi-DL＝fIFi-UL(i ═ 1, 2,... m), radio frequency fRF-DL＝fRF-UL。
In order to ensure the quality of signals after signal transmission and frequency conversion, the far-end frequency conversion unit FCU implemented in an analog manner needs to consider the following aspects:
1. a plurality of band-pass filters with excellent performance must be configured to suppress leakage and interference of adjacent channels;
2. higher requirements are provided for suppression of the harmonic waves and the spurious signals of the local oscillator, and the harmonic waves and the spurious signals are prevented from falling into a working frequency band after frequency mixing to influence communication signals;
3. a complicated circuit is required to realize the control of the gain and the correction of the flatness.
Even if this can be done, the analog multi-channel frequency conversion method still has the following obvious drawbacks:
1. a guard band must be left between the intermediate frequencies of the frequency division multiplexing combiner, which causes the waste of frequency resources of the coaxial system;
2. the frequency of the filter is fixed, and each intermediate frequency point of the frequency division multiplexing combined signal cannot be flexibly configured;
3. the out-of-band rejection and the in-band flatness of the filter form a pair of contradictions, which are difficult to be considered;
4. influence of local oscillator signal quality;
5. a complex equalization circuit and a matching circuit are needed to obtain satisfactory flatness and standing wave performance;
6. the dynamic range is small.
This makes the manufacturer have to design a specific hardware version for a specific operator and usage scenario, which makes it difficult to reduce the cost, and makes the product less flexible and widely adaptable.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a digital multichannel signal far-end frequency conversion device, which can solve the problem caused by the adoption of an analog mode for realizing a far-end Frequency Conversion Unit (FCU) at present after corresponding digital processing software is added.
The digital multi-channel signal far-end frequency conversion device comprises an FDM combiner/splitter, a coaxial port, at least two antennas and communication channels with the same number as the antennas, wherein the coaxial port is connected with the combiner end of the FDM combiner/splitter, each splitter end of the FDM combiner/splitter is respectively connected with one communication channel in a one-to-one correspondence manner, each communication channel is respectively connected with each antenna in a one-to-one correspondence manner, the coaxial port is used for being connected with a near-end main unit, aiming at any communication channel, the coaxial port comprises a coaxial side duplexer, a coaxial side downlink channel, a coaxial side uplink channel, a digital processing module, an antenna side downlink channel, an antenna side uplink channel and an antenna side duplexer, the digital processing module comprises a coaxial side input interface, a coaxial side output interface, an antenna side input interface and an antenna side output interface, the common end of the coaxial duplexer is connected with the corresponding shunt end of the FDM combiner/splitter, the output end of the coaxial duplexer is connected with the input end of the coaxial downlink channel, the input end of the coaxial downlink channel is connected with the output end of the coaxial uplink channel, the output end of the coaxial downlink channel is connected with the coaxial input interface of the digital processing module, the input end of the coaxial uplink channel is connected with the coaxial output interface of the digital processing module, the common end of the antenna duplexer is connected with a corresponding antenna, the output end of the antenna duplexer is connected with the input end of the antenna uplink channel, the input end of the antenna downlink channel is connected with the output interface of the antenna side of the digital processing module, and the output end of the antenna uplink channel is connected with the input interface of the antenna side of the digital processing module;
the coaxial side downlink channel at least comprises a coaxial side receiver, wherein the input end and the output end of the coaxial side receiver are respectively used as the input end and the output end of the coaxial side downlink channel; the coaxial side uplink channel at least comprises a coaxial side transmitter, wherein the input end and the output end of the coaxial side transmitter are respectively used as the input end and the output end of the coaxial side uplink channel; the antenna side downlink channel at least comprises an antenna side transmitter, wherein the input end and the output end of the antenna side transmitter are respectively used as the input end and the output end of the antenna side downlink channel; the antenna side uplink channel at least comprises an antenna side receiver, the input end and the output end of the antenna side receiver are respectively used as the input end and the output end of the antenna side uplink channel, the antenna side receiver at least comprises an antenna side analog-to-digital conversion module, and the input end and the output end of the antenna side analog-to-digital conversion module are respectively used as the input end and the output end of the antenna side uplink channel.
Specifically, in order to improve the signal-to-noise ratio of the system and obtain the desired transmission power, the coaxial downlink channel further includes a coaxial low-noise amplifier module, an input end of the coaxial low-noise amplifier module is used as an input end of the coaxial downlink channel, an output end of the coaxial low-noise amplifier module is connected to an input end of the coaxial receiver, and an output end of the coaxial receiver is used as an output end of the coaxial downlink channel;
the antenna side downlink channel also comprises an antenna side power amplification module, the input end of the antenna side sender is used as the input end of the antenna side downlink channel, the output end of the antenna side sender is connected with the input end of the antenna side power amplification module, and the output end of the antenna side power amplification module is used as the output end of the antenna side downlink channel;
the antenna side uplink channel also comprises an antenna side low-noise amplification module, wherein the input end of the antenna side low-noise amplification module is used as the input end of the antenna side uplink channel, the output end of the antenna side low-noise amplification module is connected with the input end of an antenna side receiver, and the output end of the antenna side receiver is used as the output end of the antenna side uplink channel;
the coaxial side uplink channel further comprises a coaxial side power amplifier module, the input end of the coaxial side transmitter is used as the input end of the coaxial side uplink channel, the output end of the coaxial side transmitter is connected with the input end of the coaxial side power amplifier module, and the output end of the coaxial side power amplifier module is used as the output end of the coaxial side uplink channel.
Further, when the sampling rates of the coaxial side analog-to-digital conversion module and the antenna side analog-to-digital conversion module are low, the coaxial side receiver further comprises a coaxial side down converter, the input end of the coaxial side down converter is used as the input end of the coaxial side receiver, the output end of the coaxial side down converter is connected with the input end of the coaxial side analog-to-digital conversion module, and the output end of the coaxial side analog-to-digital conversion module is used as the output end of the coaxial side receiver; the antenna side receiver also comprises an antenna side down converter, wherein the input end of the antenna side down converter is used as the input end of the antenna side receiver, the output end of the antenna side down converter is connected with the input end of the antenna side analog-to-digital conversion module, and the output end of the antenna side analog-to-digital conversion module is used as the output end of the antenna side receiver. When the digital-to-analog conversion module I and the digital-to-analog conversion module II adopt the digital-to-analog conversion with lower speed, the antenna side transmitter also comprises an antenna side up-converter, the input end of the antenna side digital-to-analog conversion module is used as the input end of the antenna side transmitter, the output end of the antenna side digital-to-analog conversion module is connected with the input end of the antenna side up-converter, and the output end of the antenna side up-converter is used as the output end of the antenna side transmitter; the coaxial side transmitter further comprises a coaxial side up-converter, the input end of the coaxial side digital-to-analog conversion module is used as the input end of the coaxial side transmitter, the output end of the coaxial side digital-to-analog conversion module is connected with the input end of the coaxial side up-converter, and the output end of the coaxial side up-converter is used as the output end of the coaxial side transmitter.
In particular, in order to provide a digital multi-channel signal far-end frequency conversion device which is easy to implement, the coaxial side receiver, the antenna side transmitter, the antenna side receiver and the coaxial side transmitter all adopt a zero intermediate frequency architecture.
Still further, in order to provide a simpler coaxial side receiver, coaxial side transmitter, antenna side receiver and antenna side transmitter, which can adopt a higher speed analog-to-digital/digital-to-analog conversion technology to further simplify the structure of the whole digital multichannel signal far-end frequency conversion device, the coaxial side receiver further comprises a first variable gain amplifier, the coaxial side analog-to-digital conversion module adopts a coaxial side analog-to-digital converter, the first variable gain amplifier and the coaxial side analog-to-digital converter form a coaxial side radio frequency direct acquisition receiver, the output end of the coaxial side analog-to-digital converter is used as the output end of the coaxial side radio frequency direct acquisition receiver, the input end of the coaxial side analog-to-digital converter is connected with the output end of the first variable gain amplifier, and the input end of the first variable gain amplifier is used as the input end of the coaxial side radio frequency direct acquisition receiver;
the coaxial side transmitter further comprises a second variable gain amplifier, the coaxial side digital-to-analog conversion module adopts a coaxial side digital-to-analog converter, the second variable gain amplifier and the coaxial side digital-to-analog converter form a coaxial side radio frequency direct-mining transmitter, the input end of the coaxial side digital-to-analog converter is used as the input end of the coaxial side radio frequency direct-mining transmitter, the output end of the coaxial side digital-to-analog converter is connected with the input end of the second variable gain amplifier, and the output end of the second variable gain amplifier is used as the output end of the coaxial side radio frequency direct-mining transmitter;
the antenna side transmitter further comprises a variable gain amplifier III, the antenna side digital-to-analog conversion module adopts an antenna side digital-to-analog converter, the variable gain amplifier III and the antenna side digital-to-analog converter form the antenna side radio frequency direct mining transmitter, the input end of the antenna side digital-to-analog converter is used as the input end of the antenna side radio frequency direct mining transmitter, the output end of the antenna side digital-to-analog converter is connected with the input end of the variable gain amplifier III, and the output end of the variable gain amplifier III is used as the output end of the antenna side radio frequency direct mining transmitter;
the antenna side receiver further comprises a fourth variable gain amplifier, the antenna side analog-to-digital conversion module adopts a fourth antenna side analog-to-digital converter, the fourth variable gain amplifier and the fourth antenna side analog-to-digital converter form the antenna side radio frequency direct acquisition receiver, the output end of the fourth antenna side analog-to-digital converter is used as the output end of the antenna side radio frequency direct acquisition receiver, the input end of the fourth antenna side analog-to-digital converter is connected with the output end of the fourth variable gain amplifier, and the input end of the fourth variable gain amplifier is used as the input end of the antenna side radio frequency direct acquisition receiver.
Another technical solution adopted by the present invention to solve the above technical problems is that the digital multichannel signal far-end frequency conversion apparatus includes a coaxial port, a coaxial side communication channel, a digital processing unit, at least two antennas, and antenna side communication channels with the same number as the antennas, where the digital processing unit includes a coaxial side input interface, a coaxial side output interface, and at least antenna side communication interfaces with the same number as the antennas, the antenna side communication interfaces include an antenna side input interface and an antenna side output interface, and the coaxial side communication channel includes a coaxial side duplexer, a coaxial side downlink channel, and a coaxial side uplink channel;
the system comprises a near-end main unit, a coaxial port, a coaxial side duplexer, a coaxial side communication interface, a digital processing unit, a coaxial side communication channel, a coaxial side communication interface and a plurality of antennas, wherein the coaxial port is used for being connected with the near-end main unit, the coaxial port is connected with a common end of the coaxial side duplexer, an output end of the coaxial side duplexer is connected with a coaxial side input interface of the digital processing unit through a coaxial side downlink channel, a coaxial side output interface of the digital processing unit is connected with an input end of the coaxial side duplexer through a coaxial side uplink channel, each antenna side communication interface of the digital processing unit corresponds to each antenna side communication channel and each antenna one by one, and each antenna side communication interface of the digital processing unit is connected with each corresponding antenna one by each antenna side communication channel corresponding to the antenna side communication interface;
the coaxial side downlink channel at least comprises a full-capture receiver, wherein the input end and the output end of the full-capture transmitter are respectively used as the input end and the output end of the coaxial side downlink channel; the coaxial side uplink channel at least comprises a full-spectrum transmitter, wherein the input end and the output end of the full-spectrum receiver are respectively used as the input end and the output end of the coaxial side uplink channel, the full-spectrum transmitter at least comprises a full-spectrum digital-to-analog conversion module, and the input end and the output end of the full-spectrum digital-to-analog conversion module are respectively used as the input end and the output end of the full-spectrum transmitter;
aiming at any antenna side communication channel, the antenna side communication channel comprises an antenna side downlink channel, an antenna side uplink channel and an antenna side duplexer, wherein a common end of the antenna side duplexer is connected with a corresponding antenna, an input end of the antenna side downlink channel is connected with an antenna side output interface of the corresponding antenna side communication end in the digital processing unit, an output end of the antenna side downlink channel is connected with an input end of the antenna side duplexer, an output end of the antenna side uplink channel is connected with an antenna side input interface of the corresponding antenna side communication end in the digital processing unit, and an input end of the antenna side uplink channel is connected with an output end of the antenna side duplexer;
the antenna side downlink channel at least comprises an antenna side transmitter, wherein the input end and the output end of the antenna side transmitter are respectively used as the input end and the output end of the antenna side downlink channel; the antenna side uplink channel at least comprises an antenna side receiver, the input end and the output end of the antenna side receiver are respectively used as the input end and the output end of the antenna side uplink channel, the antenna side receiver at least comprises an antenna side analog-to-digital conversion module, and the input end and the output end of the antenna side analog-to-digital conversion module are respectively used as the input end and the output end of the antenna side receiver.
Specifically, in order to improve the signal-to-noise ratio of the system and obtain the desired transmission power, the coaxial downlink channel further includes a coaxial low-noise amplifier module, an input end of the coaxial low-noise amplifier module is used as an input end of the coaxial downlink channel, an output end of the coaxial low-noise amplifier module is connected to an input end of the full-capture receiver, and an output end of the full-capture transmitter is used as an output end of the coaxial downlink channel;
the coaxial side uplink channel also comprises a coaxial side power amplifier module, wherein the output end of the coaxial side power amplifier module is used as the output end of the coaxial side uplink channel, the input end of the coaxial side power amplifier module is connected with the output end of the full-spectrum receiver, and the input end of the full-spectrum transmitter is used as the input end of the coaxial side uplink channel;
the antenna side downlink channel also comprises an antenna side power amplification module, the input end of the antenna side sender is used as the input end of the antenna side downlink channel, the output end of the antenna side sender is connected with the input end of the antenna side power amplification module, and the output end of the antenna side power amplification module is used as the output end of the antenna side downlink channel;
the antenna side uplink channel further comprises an antenna side low noise amplification module, the input end of the antenna side low noise amplification module is used as the input end of the antenna side uplink channel, the output end of the antenna side low noise amplification module is connected with the input end of the antenna side receiver, and the output end of the antenna side receiver is used as the output end of the antenna side uplink channel.
Further, when the sampling rate of the full-capture analog-to-digital conversion module is low, the full-capture receiver further comprises a coaxial side down converter, the input end of the coaxial side down converter is connected as the input end of the full-capture receiver, the output end of the coaxial side down converter is connected with the input end of the full-capture analog-to-digital conversion module, and the output end of the full-capture analog-to-digital conversion module is used as the output end of the full-capture receiver; when the full-spectrum digital-to-analog conversion module adopts the digital-to-analog conversion with a lower speed, the full-spectrum transmitter further comprises a coaxial side up-converter, the output end of the coaxial side up-converter is used as the output end of the full-spectrum transmitter, the input end of the coaxial side up-converter is connected with the output end of the full-spectrum digital-to-analog conversion module, and the input end of the full-spectrum digital-to-analog conversion module is used as the input end of the full-spectrum transmitter.
Specifically, when the sampling rate of the antenna side analog-to-digital conversion module is low, the antenna side transmitter further includes an antenna side up-converter, an input end of the antenna side analog-to-digital conversion module is used as an input end of the antenna side transmitter, an output end of the antenna side analog-to-digital conversion module is connected with an input end of the antenna side up-converter, and an output end of the antenna side up-converter is used as an output end of the antenna side transmitter; when the antenna side digital-to-analog conversion module adopts the digital-to-analog conversion with a lower speed, the antenna side receiver further comprises an antenna side down converter, the input end of the antenna side down converter is used as the input end of the antenna side receiver, the output end of the antenna side down converter is connected with the input end of the antenna side analog-to-digital conversion module, and the output end of the antenna side analog-to-digital conversion module is used as the output end of the antenna side receiver.
Specifically, in order to provide a structure of the full-capture receiver, the full-capture receiver further includes a first variable gain amplifier, the full-capture analog-to-digital conversion module employs an analog-to-digital converter, an input end of the first variable gain amplifier is used as an input end of the full-capture receiver, an output end of the first variable gain amplifier is connected with an input end of the analog-to-digital converter, and an output end of the analog-to-digital converter is used as an output end of the full-capture receiver; in order to provide a structure of the full-spectrum transmitter, the full-spectrum transmitter further comprises a second variable gain amplifier, the full-spectrum digital-to-analog conversion module adopts a digital-to-analog converter, an output end of the second variable gain amplifier is used as an output end of the full-spectrum transmitter, an input end of the digital-to-analog converter is used as an input end of the full-spectrum transmitter, and an output end of the digital-to-analog converter is connected with an input end of the second variable gain amplifier.
Still further, in order to provide an antenna side communication channel which is easy to implement, the antenna side transmitter and the antenna side receiver adopt a zero intermediate frequency architecture.
Specifically, in order to simplify the structure of the antenna side communication channel, a higher-speed analog-to-digital conversion technology can be adopted, and further the structure of the whole digital multichannel signal far-end frequency conversion device is simplified, the antenna side transmitter further comprises a variable gain amplifier iii, the antenna side digital-to-analog conversion module adopts an antenna side digital-to-analog converter, the variable gain amplifier iii and the antenna side digital-to-analog converter constitute an antenna side radio frequency direct acquisition transmitter, the input end of the antenna side digital-to-analog converter serves as the input end of the antenna side radio frequency direct acquisition transmitter, the output end of the antenna side digital-to-analog converter is connected with the input end of the variable gain amplifier iii, and the output end of the variable gain amplifier iii serves as the output end of the antenna side radio frequency direct acquisition transmitter; the antenna side receiver further comprises a fourth variable gain amplifier, the antenna side analog-to-digital conversion module adopts a fourth antenna side analog-to-digital converter, the fourth variable gain amplifier and the fourth antenna side analog-to-digital converter form the antenna side radio frequency direct acquisition receiver, the output end of the fourth antenna side analog-to-digital converter is used as the output end of the antenna side radio frequency direct acquisition receiver, the input end of the fourth antenna side analog-to-digital converter is connected with the output end of the fourth variable gain amplifier, and the input end of the fourth variable gain amplifier is used as the input end of the antenna side radio frequency direct acquisition receiver.
The utility model has the beneficial effects that in the scheme of the utility model, the utility model provides a digital multichannel signal far-end frequency conversion device, which adopts the existing high-speed analog-to-digital conversion and digital-to-analog conversion technology, and can realize the process of converting the digital frequency division multiplexing intermediate frequency downlink/uplink signal at the coaxial side to MIMO transmission/reception at the antenna side after adding corresponding processing software, and the digital multichannel signal far-end frequency conversion device has the following advantages after being digitized: 1. the method does not depend on the performance of a hardware filter completely any more, and can fully utilize a digital filtering technology to suppress adjacent frequency and clutter interference; 2. excessive guard bands do not need to be reserved among the intermediate frequencies of the frequency division multiplexing, so that frequency resources in coaxial transmission can be greatly saved; 3. the frequency points of all channels used by the coaxial intermediate frequency division multiplexing can be flexibly configured, and are not limited to the fixed limit of the frequency points of a hardware filter; 4. except that the transceivers (the part between the antenna or the coaxial port and the corresponding analog-to-digital conversion module) on the two sides can use the frequency conversion in an analog mode, the frequency conversion in the digital domain avoids the negative influence brought by the quality of analog local oscillation signals; 5. flatness correction and gain adjustment can be realized by adopting an algorithm of a digital domain, so that the technical difficulty of realizing by adopting a complex hardware circuit is avoided; 6. the matching circuit and the shunt and combiner are simplified; 7. digital pre-distortion (DPD), peak Clipping (CFR) and the like can be used in the digital processing module or the digital processing unit, so that the efficiency of using the power amplifier module at the later stage and the output capacity of the power amplifier module are improved.
In addition, there are many very mature chip products of single-path and multi-path transceivers of various architectures available on the market, whether at radio frequency or at intermediate frequency. The chips can adjust the channel gain according to the working level, implement high-speed analog-to-digital conversion and digital-to-analog conversion, and provide an interface with a digital processing module or a digital processing unit. Currently, the operable frequency range of these commercially available transceiver chips is extremely wide, usually starting from 100MHz, covering the entire Sub-6 (i.e., <6GHz) and even exceeding the Sub-6 band, reaching 7, 8 GHz; the working bandwidth of the system reaches more than 100MHz, and the system is completely suitable for the commercial use of the current 5G system. The large-scale commercialization of such chips also contributes to cost reduction thereof. The chips can greatly simplify the design work of the digital multichannel signal far-end frequency conversion device, and can fully utilize the batch advantages of the chips to reduce the overall cost of the digital multichannel signal far-end frequency conversion device.
At present, about 80% of the deployed indoor distribution systems are coaxial media, and the broadcast television network has almost 100% of coaxial home-entry and community transmission resources. By adopting the patent ZL 201911236246.8 technology and the digital multi-channel signal far-end frequency conversion device, the original coaxial resources can be fully utilized, and the problem of 5G coverage blind areas such as shopping malls, office buildings, underground garages, construction sites for temporarily building base stations, closed communities and the like is solved.
Drawings
Fig. 1 is a schematic diagram of the digital multichannel signal far-end frequency conversion device of the utility model.
Fig. 2 is a schematic diagram of another digital multichannel signal remote frequency conversion device according to the present invention.
Fig. 3 is a schematic diagram of a digital multichannel signal far-end frequency conversion device in embodiment 1 of the present invention.
Fig. 4 is a schematic diagram of a digital multichannel signal far-end frequency conversion device according to embodiment 2 of the present invention.
Fig. 5 is a schematic diagram of a digital multichannel signal far-end frequency conversion device according to embodiment 3 of the present invention.
Detailed Description
The technical solution of the present invention is described in detail below with reference to the embodiments and the accompanying drawings.
The utility model relates to a digital multi-channel signal remote frequency conversion device, the principle schematic diagram of which is shown in figure 1, comprising an FDM combiner/splitter, a coaxial port, at least two antennas and communication channels with the same number as the antennas, wherein the coaxial port is connected with the combiner end of the FDM combiner/splitter, each splitter end of the FDM combiner/splitter is respectively connected with one communication channel in a one-to-one correspondence way, each communication channel is respectively connected with each antenna in a one-to-one correspondence way, the coaxial port is used for being connected with a near-end main unit, aiming at any communication channel, the digital processing module comprises a coaxial side duplexer, a coaxial side downlink channel, a coaxial side uplink channel, a digital processing module, an antenna side downlink channel, an antenna side uplink channel and an antenna side duplexer, wherein the digital processing module comprises a coaxial side input interface, a coaxial side output interface, an antenna side input interface and an antenna side output interface, then there are: the common end of the coaxial duplexer is connected with the corresponding shunt end of the FDM combiner/splitter, the output end of the coaxial duplexer is connected with the input end of the coaxial downlink channel, the input end of the coaxial downlink channel is connected with the output end of the coaxial uplink channel, the output end of the coaxial downlink channel is connected with the coaxial input interface of the digital processing module, the input end of the coaxial uplink channel is connected with the coaxial output interface of the digital processing module, the common end of the antenna duplexer is connected with a corresponding antenna, the output end of the antenna duplexer is connected with the input end of the antenna uplink channel, the input end of the antenna downlink channel is connected with the output interface of the antenna side of the digital processing module, and the output end of the antenna uplink channel is connected with the input interface of the antenna side of the digital processing module;
the coaxial side downlink channel at least comprises a coaxial side receiver, wherein the input end and the output end of the coaxial side receiver are respectively used as the input end and the output end of the coaxial side downlink channel, the coaxial side receiver at least comprises a coaxial side analog-to-digital conversion module, and the input end and the output end of the coaxial side analog-to-digital conversion module are respectively used as the input end and the output end of the coaxial side receiver; the coaxial side uplink channel at least comprises a coaxial side transmitter, wherein the input end and the output end of the coaxial side transmitter are respectively used as the input end and the output end of the coaxial side uplink channel, the coaxial side transmitter at least comprises a coaxial side digital-to-analog conversion module, and the input end and the output end of the coaxial side digital-to-analog conversion module are respectively used as the input end and the output end of the coaxial side uplink channel; the antenna side downlink channel at least comprises an antenna side transmitter, wherein the input end and the output end of the antenna side transmitter are respectively used as the input end and the output end of the antenna side downlink channel, the antenna side transmitter at least comprises an antenna side digital-to-analog conversion module, and the input end and the output end of the antenna side digital-to-analog conversion module are respectively used as the input end and the output end of the antenna side downlink channel; the antenna side uplink channel at least comprises an antenna side receiver, the input end and the output end of the antenna side receiver are respectively used as the input end and the output end of the antenna side uplink channel, the antenna side receiver at least comprises an antenna side analog-to-digital conversion module, and the input end and the output end of the antenna side analog-to-digital conversion module are respectively used as the input end and the output end of the antenna side uplink channel.
In order to improve the signal-to-noise ratio of the system and obtain the desired transmitting power, the coaxial downlink channel may further include a coaxial low-noise amplifier module, an input end of the coaxial low-noise amplifier module is used as an input end of the coaxial downlink channel, an output end of the coaxial low-noise amplifier module is connected to an input end of the coaxial receiver, and an output end of the coaxial receiver is used as an output end of the coaxial downlink channel; the antenna side downlink channel can also comprise an antenna side power amplification module, the input end of the antenna side sender is used as the input end of the antenna side downlink channel, the output end of the antenna side sender is connected with the input end of the antenna side power amplification module, and the output end of the antenna side power amplification module is used as the output end of the antenna side downlink channel; the antenna side uplink channel can also comprise an antenna side low-noise amplification module, the input end of the antenna side low-noise amplification module is used as the input end of the antenna side uplink channel, the output end of the antenna side low-noise amplification module is connected with the input end of the antenna side receiver, and the output end of the antenna side receiver is used as the output end of the antenna side uplink channel; the coaxial side uplink channel can also comprise a coaxial side power amplifier module, the input end of the coaxial side transmitter is used as the input end of the coaxial side uplink channel, the output end of the coaxial side transmitter is connected with the input end of the coaxial side power amplifier module, and the output end of the coaxial side power amplifier module is used as the output end of the coaxial side uplink channel. The coaxial side low-noise amplification module and the antenna side low-noise amplification module (collectively referred to as low-noise amplification modules, which refer to small-signal amplifiers with low noise coefficients) can amplify weak signals and reduce the noise of the whole coaxial side receiver and the antenna side receiver, so that the signal-to-noise ratio of the system is improved; the coaxial side power amplifier module and the antenna side power amplifier module (collectively referred to as power amplifier module) can amplify the power of the input signal to obtain the expected transmitting power (or transmitting power).
When the sampling rates of the coaxial side module-to-digital conversion module and the antenna side analog-to-digital conversion module are lower, the coaxial side receiver can also comprise a coaxial side down converter, the input end of the coaxial side down converter is used as the input end of the coaxial side receiver, the output end of the coaxial side down converter is connected with the input end of the coaxial side module-to-digital conversion module, and the output end of the coaxial side module-to-digital conversion module is used as the output end of the coaxial side receiver, so that the signal input to the coaxial side module-to-digital conversion module can be shifted to a lower frequency to adapt to the sampling rate of the coaxial side module-to-digital conversion module; the antenna side receiver can further comprise an antenna side down converter, the input end of the antenna side down converter is used as the input end of the antenna side receiver, the output end of the antenna side down converter is connected with the input end of the antenna side analog-to-digital conversion module, the output end of the antenna side analog-to-digital conversion module is used as the output end of the antenna side receiver, and similarly, signals input to the antenna side analog-to-digital conversion module can be moved to a lower frequency to adapt to the sampling rate of the antenna side analog-to-digital conversion module.
When the antenna side digital-to-analog conversion module and the coaxial side digital-to-analog conversion module adopt low-speed digital-to-analog conversion, the antenna side transmitter can also comprise an antenna side up-converter, the input end of the antenna side digital-to-analog conversion module is used as the input end of the antenna side transmitter, the output end of the antenna side digital-to-analog conversion module is connected with the input end of the antenna side up-converter, and the output end of the antenna side up-converter is used as the output end of the antenna side transmitter, so that low-frequency analog signals generated by the antenna side digital-to-analog conversion module can be moved to radio frequency carrier frequency to obtain radio frequency signals; the coaxial side transmitter may further include a coaxial side up-converter, an input end of the coaxial side digital-to-analog conversion module is used as an input end of the coaxial side transmitter, an output end of the coaxial side digital-to-analog conversion module is connected to an input end of the coaxial side up-converter, and an output end of the coaxial side up-converter is used as an output end of the coaxial side transmitter.
Because the receiver and the transmitter of the zero intermediate frequency architecture are developed and widely applied in the prior communication technology in order to reduce the requirement on the sampling rate of the analog-digital conversion module and the requirement on the rate of the digital-analog conversion module, and a large number of highly integrated zero intermediate frequency transceivers are also developed by various chip manufacturers and put on the market for convenient use, the coaxial side receiver, the antenna side transmitter, the antenna side receiver and the coaxial side transmitter can all adopt the zero intermediate frequency architecture in order to provide a digital multi-channel signal far-end frequency conversion device which is easy to realize.
In view of the rapid development of the high-speed analog-to-digital conversion technology, the direct sampling can be realized at the radio frequency with very high frequency, to provide a simpler coaxial side receiver, coaxial side transmitter, antenna side receiver and antenna side transmitter, so as to simplify the structure of the whole digital multichannel signal far-end frequency conversion device, the coaxial side receiver can also comprise a variable gain amplifier I, the coaxial side analog-to-digital conversion module adopts a coaxial side analog-to-digital converter, the first variable gain amplifier and the coaxial side analog-to-digital converter form a coaxial side radio frequency direct acquisition receiver, the output end of the coaxial side analog-to-digital converter is used as the output end of the coaxial side radio frequency direct acquisition receiver, the input end of the coaxial side analog-to-digital converter is connected with the output end of the first variable gain amplifier, and the input end of the first variable gain amplifier is used as the input end of the coaxial side radio frequency direct acquisition receiver; the coaxial side transmitter can also comprise a second variable gain amplifier, the second coaxial side digital-to-analog conversion module adopts a second coaxial side digital-to-analog converter, the second variable gain amplifier and the second coaxial side digital-to-analog converter form a second coaxial side radio frequency direct-sampling transmitter, the input end of the second coaxial side digital-to-analog converter is used as the input end of the second coaxial side radio frequency direct-sampling transmitter, the output end of the second coaxial side digital-to-analog converter is connected with the input end of the second variable gain amplifier, and the output end of the second variable gain amplifier is used as the output end of the second coaxial side radio frequency direct-sampling transmitter; the antenna side transmitter can also comprise a third variable gain amplifier, the antenna side digital-to-analog conversion module adopts an antenna side digital-to-analog converter, the third variable gain amplifier and the antenna side digital-to-analog converter form the antenna side radio frequency direct mining transmitter, the input end of the antenna side digital-to-analog converter is used as the input end of the antenna side radio frequency direct mining transmitter, the output end of the antenna side digital-to-analog converter is connected with the input end of the third variable gain amplifier, and the output end of the third variable gain amplifier is used as the output end of the antenna side radio frequency direct mining transmitter; the antenna side receiver can also comprise a fourth variable gain amplifier, the antenna side analog-to-digital conversion module adopts an antenna side analog-to-digital converter, the fourth variable gain amplifier and the antenna side analog-to-digital converter form the antenna side radio frequency direct acquisition receiver, the output end of the antenna side analog-to-digital converter is used as the output end of the antenna side radio frequency direct acquisition receiver, the input end of the antenna side analog-to-digital converter is connected with the output end of the fourth variable gain amplifier, and the input end of the fourth variable gain amplifier is used as the input end of the antenna side radio frequency direct acquisition receiver. In this scheme, it is not necessary to add a coaxial up-converter and/or a coaxial down-converter and/or an antenna up-converter and/or an antenna down-converter under general conditions, and if necessary in extreme circumstances, the input end of the down-converter (the coaxial down-converter or the antenna down-converter) is used as the input end of the coaxial receiver or the antenna receiver, the output end of the down-converter is connected with the input end of the corresponding variable gain amplifier (the first variable gain amplifier or the fourth variable gain amplifier), the output end of the up-converter (the coaxial up-converter or the antenna up-converter) is used as the output end of the coaxial transmitter or the antenna transmitter, and the input end of the up-converter is connected with the output end of the corresponding variable gain amplifier (the second variable gain amplifier or the third variable gain amplifier).
The utility model relates to another digital multichannel signal far-end frequency conversion device, a schematic diagram of the principle of which is shown in fig. 2, and the device comprises a coaxial port, a coaxial side communication channel, a digital processing unit, at least two antennas and antenna side communication channels with the same number as the antennas, wherein the digital processing unit comprises a coaxial side input interface, a coaxial side output interface and at least antenna side communication interfaces with the same number as the antennas, the antenna side communication interfaces comprise an antenna side input interface and an antenna side output interface, and the coaxial side communication channels comprise a coaxial side duplexer, a coaxial side downlink channel and a coaxial side uplink channel; the system comprises a near-end main unit, a coaxial port, a coaxial side duplexer, a coaxial side communication interface, a digital processing unit, a near-end main unit, a coaxial side duplexer, a coaxial side uplink channel, a coaxial side downlink channel, a coaxial side uplink channel, a coaxial side downlink interface, a coaxial side output interface, a coaxial side uplink channel, a coaxial side uplink interface, a coaxial side communication interface, a near-end main unit, a near-end main unit near-end main unit, a near-end near-;
the coaxial side downlink channel at least comprises a full-capture receiver, wherein the input end and the output end of the full-capture transmitter are respectively used as the input end and the output end of the coaxial side downlink channel; the coaxial side uplink channel at least comprises a full-spectrum transmitter, wherein the input end and the output end of the full-spectrum receiver are respectively used as the input end and the output end of the coaxial side uplink channel, the full-spectrum transmitter at least comprises a full-spectrum digital-to-analog conversion module, and the input end and the output end of the full-spectrum digital-to-analog conversion module are respectively used as the input end and the output end of the full-spectrum transmitter;
aiming at any antenna side communication channel, the antenna side communication channel comprises an antenna side downlink channel, an antenna side uplink channel and an antenna side duplexer, wherein a public end of the antenna side duplexer is connected with a corresponding antenna, an input end of the antenna side downlink channel is connected with an antenna side output interface of the corresponding antenna side communication end in the digital processing unit, an output end of the antenna side downlink channel is connected with an input end of the antenna side duplexer, an output end of the antenna side uplink channel is connected with an antenna side input interface of the corresponding antenna side communication end in the digital processing unit, and an input end of the antenna side uplink channel is connected with an output end of the antenna side duplexer;
the antenna side downlink channel at least comprises an antenna side transmitter, wherein the input end and the output end of the antenna side transmitter are respectively used as the input end and the output end of the antenna side downlink channel, the antenna side transmitter at least comprises an antenna side digital-to-analog conversion module, and the input end and the output end of the antenna side digital-to-analog conversion module are respectively used as the input end and the output end of the antenna side transmitter; the antenna side uplink channel at least comprises an antenna side receiver, the input end and the output end of the antenna side receiver are respectively used as the input end and the output end of the antenna side uplink channel, the antenna side receiver at least comprises an antenna side analog-to-digital conversion module, and the input end and the output end of the antenna side analog-to-digital conversion module are respectively used as the input end and the output end of the antenna side receiver.
In order to improve the signal-to-noise ratio of the system and obtain the desired transmission power, the coaxial downlink channel may further include a coaxial low-noise amplifier module, an input end of the coaxial low-noise amplifier module is used as an input end of the coaxial downlink channel, an output end of the coaxial low-noise amplifier module is connected to an input end of the full-capture receiver, and an output end of the full-capture transmitter is used as an output end of the coaxial downlink channel; the coaxial side uplink channel can also comprise a coaxial side power amplifier module, the output end of the coaxial side power amplifier module is used as the output end of the coaxial side uplink channel, the input end of the coaxial side power amplifier module is connected with the output end of the full-spectrum receiver, and the input end of the full-spectrum transmitter is used as the input end of the coaxial side uplink channel; the antenna side downlink channel can also comprise an antenna side power amplification module, the input end of the antenna side sender is used as the input end of the antenna side downlink channel, the output end of the antenna side sender is connected with the input end of the antenna side power amplification module, and the output end of the antenna side power amplification module is used as the output end of the antenna side downlink channel; the antenna side uplink channel can also comprise an antenna side low-noise amplifier module, the input end of the antenna side low-noise amplifier module is used as the input end of the antenna side uplink channel, the output end of the antenna side low-noise amplifier module is connected with the input end of the antenna side receiver, and the output end of the antenna side receiver is used as the output end of the antenna side uplink channel. The coaxial side low-noise amplification module and the antenna side low-noise amplification module (collectively referred to as low-noise amplification modules, which refer to small-signal amplifiers with low noise coefficients) can amplify weak signals and reduce the noise of the whole coaxial side receiver and the antenna side receiver, so that the signal-to-noise ratio of the system is improved; the coaxial side power amplifier module and the antenna side power amplifier module (collectively referred to as power amplifier module) can amplify the power of the input signal to obtain the expected transmitting power (or transmitting power).
When the sampling rate of the full-capture analog-to-digital conversion module is lower, the full-capture receiver can further comprise a coaxial side down converter, the input end of the coaxial side down converter is used as the input end of the full-capture receiver to be connected, the output end of the coaxial side down converter is connected with the input end of the full-capture analog-to-digital conversion module, and the output end of the full-capture analog-to-digital conversion module is used as the output end of the full-capture receiver, so that a signal (frequency division multiplexing intermediate frequency downlink combined signal) input to the full-capture analog-to-digital conversion module can be shifted to a lower frequency for analog-to-digital conversion; when the full-spectrum digital-to-analog conversion module adopts the digital-to-analog conversion with a lower rate, the full-spectrum transmitter can further comprise a coaxial-side up-converter, the output end of the coaxial-side up-converter is used as the output end of the full-spectrum transmitter, the input end of the coaxial-side up-converter is connected with the output end of the full-spectrum digital-to-analog conversion module, and the input end of the full-spectrum digital-to-analog conversion module is used as the input end of the full-spectrum transmitter, so that a signal (a lower frequency division multiplexing intermediate frequency uplink combined signal) output by the full-spectrum digital-to-analog conversion module can be moved to an intermediate frequency specified by coaxial transmission.
When the sampling rate of the antenna side analog-digital conversion module is lower, the antenna side transmitter can further comprise an antenna side up-converter, the input end of the antenna side analog-digital conversion module is used as the input end of the antenna side transmitter, the output end of the antenna side digital-analog conversion module is connected with the input end of the antenna side up-converter, and the output end of the antenna side up-converter is used as the output end of the antenna side transmitter, so that analog signals with lower frequency generated by the antenna side digital-analog conversion module can be moved to the radio frequency carrier frequency to obtain radio frequency signals; when the antenna side digital-to-analog conversion module adopts the digital-to-analog conversion with a lower rate, the antenna side receiver can further comprise an antenna side down converter, the input end of the antenna side down converter is used as the input end of the antenna side receiver, the output end of the antenna side down converter is connected with the input end of the antenna side analog-to-digital conversion module, and the output end of the antenna side analog-to-digital conversion module is used as the output end of the antenna side receiver, so that signals input to the antenna side analog-to-digital conversion module can be moved to a lower frequency to adapt to the input of the antenna side analog-to-digital conversion module.
In order to provide a structure of the full-capture receiver, the full-capture receiver may further include a first variable gain amplifier, and the full-capture analog-to-digital conversion module employs an analog-to-digital converter, wherein an input end of the first variable gain amplifier is used as an input end of the full-capture receiver, an output end of the first variable gain amplifier is connected to an input end of the analog-to-digital converter, and an output end of the analog-to-digital converter is used as an output end of the full-capture receiver, so that a received signal can be adjusted to a level suitable for the analog-to-digital converter through the first variable gain amplifier. In order to provide a structure of the full-spectrum transmitter, the full-spectrum transmitter may further include a second variable gain amplifier, the full-spectrum digital-to-analog conversion module employs a digital-to-analog converter, wherein an output end of the second variable gain amplifier serves as an output end of the full-spectrum transmitter, an input end of the digital-to-analog converter serves as an input end of the full-spectrum transmitter, and an output end of the digital-to-analog converter is connected to an input end of the second variable gain amplifier, so that the second variable gain amplifier may provide a suitable driving level or a suitable output level for a subsequent coaxial-side power amplification module.
In order to provide an antenna side communication channel which is easy to implement, the antenna side transmitter and the antenna side receiver can adopt a zero intermediate frequency architecture.
In view of the rapid development of the high-speed analog-to-digital/digital-to-analog conversion technology at present, direct sampling can be realized on the radio frequency with very high frequency, so that in order to simplify the structure of the antenna side communication channel and further simplify the structure of the whole digital multichannel signal far-end frequency conversion device, the antenna side transmitter can also comprise a variable gain amplifier III, and an antenna side digital-to-analog conversion module adopts an antenna side digital-to-analog converter, wherein the variable gain amplifier III and the antenna side digital-to-analog converter form the antenna side radio frequency direct transmission device, the input end of the antenna side digital-to-analog converter is used as the input end of the antenna side radio frequency direct transmission device, the output end of the antenna side digital-to-analog converter is connected with the input end of the variable gain amplifier III, and the output end of the variable gain amplifier III is used as the output end of the antenna side radio frequency direct transmission device; the antenna side receiver also comprises a fourth variable gain amplifier, the antenna side analog-to-digital conversion module adopts an antenna side analog-to-digital converter, wherein the fourth variable gain amplifier and the antenna side analog-to-digital converter form the antenna side radio frequency direct acquisition receiver, the output end of the antenna side analog-to-digital converter is used as the output end of the antenna side radio frequency direct acquisition receiver, the input end of the antenna side analog-to-digital converter is connected with the output end of the fourth variable gain amplifier, and the input end of the fourth variable gain amplifier is used as the input end of the antenna side radio frequency direct acquisition receiver.
In the present invention, the coaxial side and the antenna side are defined by a digital processing module or a digital processing unit, a portion near the coaxial port is the coaxial side, and a portion near the antenna portion is the antenna side.
Example 1
The digital multichannel signal far-end frequency conversion device in embodiment 1 of the present invention is shown in fig. 3 for a schematic diagram.
As shown in fig. 3, for the downstream (i.e. the transmission direction, the same applies below), the intermediate frequency downstream signal S of each downstream channel is separated by the FDM combiner/splitter (in this case, the splitting function), and the coaxial duplexerIFi-DL(i ═ 1, 2.. times, m) is firstly amplified by a coaxial side low-noise amplifier module and then enters a sampling process of a coaxial side receiver; the sampling of the coaxial receiver adopts a zero intermediate frequency receiver structure, which comprises a variable gain amplifier for adjusting the signal strengthThen, a downstream I, Q signal of the channel is formed through quadrature mixing, low-pass filtering is performed, and then analog-to-digital conversion ADC sampling is performed (a downstream zero intermediate frequency receiver on the coaxial side is formed from a variable gain amplifier to an analog-to-digital conversion ADC part, and is generally completed by using a highly integrated commercial chip, namely, a coaxial side receiver); after the ADC is performed, the digitized downlink I, Q signal of the channel enters a digital processing module to perform digital domain processing, including digital filtering, flatness correction, gain adjustment, and the like (optionally, for a scenario of high-power antenna port output, predistortion operation and peak clipping operation may be added to improve the efficiency of a post-stage antenna side power amplifier module); the downlink I, Q digital signal of the channel processed by the digital domain is transmitted to an antenna side digital-to-analog conversion DAC for digital-to-analog conversion to form an analog downlink I, Q signal; similarly, the transmitter at the antenna side also adopts a zero-if transmitter architecture, analog downlink I, Q signals are respectively subjected to low-pass filtering, quadrature frequency mixing is carried out, and then I, Q signals are combined and output as the radio-frequency signal S of the channel where the signals need to be transmitted(RF-DL)i(i ═ 1, 2.. multidata, m) and variable gain amplifier drive amplification (from the digital-to-analog conversion DAC to the variable gain amplifier drive amplification section constitutes the antenna side down-link "zero intermediate frequency transmitter", i.e. the antenna side transmitter); and then the signals are transmitted to the antenna corresponding to the channel through the antenna side power amplification module and the antenna side duplexer.
For the uplink (i.e., the receive direction, the same applies below), the ith channel receives the RF signal S from the antenna(RF-UL)iAfter (i ═ 1, 2.. multidot.m), the signal is amplified by an antenna side duplexer and an antenna side low-noise amplifier module of the channel, and then the sampling process of analog-to-digital conversion ADC is carried out; the sampling of the ADC also adopts the architecture of a zero-if receiver, including a variable gain amplifier to adjust the signal strength, then quadrature mixing to form an upstream I, Q signal in the channel, then low-pass filtering, and then sampling the ADC (the part from the variable gain amplifier to the ADC forms an upstream "zero-if receiver" on the antenna side, which is usually completed by a highly integrated commercial chip, i.e. the antenna sideA receiver); after the ADC, the digitized uplink I, Q of the channel enters a digital processing module to perform digital domain processing, including filtering, flatness correction, gain adjustment, and the like (optionally, for a scenario of high-power coaxial port output, predistortion operation and peak clipping operation may be added to improve the efficiency of the rear-stage coaxial side power amplifier module); the channel uplink I, Q signal processed by the digital domain is transmitted to a coaxial side digital-to-analog conversion DAC for digital-to-analog conversion to form an analog uplink I, Q signal; similarly, the coaxial side transmitter also adopts a zero-intermediate frequency transmitter architecture, analog uplink I, Q signals are respectively subjected to low-pass filtering, then subjected to quadrature mixing, and then combined to output the required channel intermediate frequency uplink signal SIFi-UL(i ═ 1, 2.. multidata, m) and variable gain amplifier drive amplification (from digital-to-analog conversion DAC to I, Q quadrature mixing combiner, the down going "zero if transmitter" on the coaxial side is formed, i.e. coaxial side transmitter), then the if up signal of each receiving channel is sent to FDM combiner/splitter (in this case, combining action) via the coaxial side power amplifier module and coaxial side duplexer of each channel to form frequency division multiplexing if up combined signal Σ (S)IF1-UL，SIF2-UL，...，SIFm-UL)。
Adopting zero intermediate frequency, the relationship between local oscillation signals and respective intermediate frequency and radio frequency is as follows:
fIFi_DL＝fLOi_IF_DL，(i＝1，2，...，m)
fRF_DL＝fLO_RF_DL
fIFi_UL＝fLOi_IF_UL，(i＝1，2，...，m)
fRF_UL＝fLO_RF_UL
if the communication system is in TDD operation mode, then
fIFi_DL＝fIFi_UL＝fLOi_IF_DL＝fLOi_IF_UL，(i＝1，2，...，m)
fRF_DL＝fRF_UL＝fLO_RF_DL＝fLO_RF_UL
Wherein, the same vibration source (coaxial side, antenna side) of the up-down line can be shared.
Example 2
In most cases, the intermediate frequency downstream-combined signal Σ (S) is due to so-called frequency division multiplexing on the coaxial sideIF1-DL， SIF2-DL，...，SIFm-DL) And frequency division multiplexing intermediate frequency uplink combined signal sigma (S)IF1-UL，SIF2-UL,.. and SIFm-UL) All the working frequency points use lower frequency, and according to the current analog-to-digital conversion technology, the analog-to-digital conversion sampling of the downlink combined signal in a full capture mode and the full-spectrum digital-to-analog conversion of the uplink combined signal can be easily realized. The simplification of the digital FCU can be achieved to some extent by using "full capture" analog-to-digital conversion and "full spectrum" digital-to-analog conversion on the coaxial side. The schematic diagram of the digital multichannel signal far-end frequency conversion device in embodiment 2 of the present invention, referring to fig. 4, provides a digital multichannel signal far-end frequency conversion device that adopts a full capture analog-to-digital conversion mode on the coaxial side and adopts a zero intermediate frequency architecture on the antenna side.
As shown in fig. 4, for the downlink, the frequency division multiplexing intermediate frequency downlink combined signal Σ (S) received by the coaxial sideIF1-DL， SIF2-DL，...，SIFm-DL) After being amplified by a coaxial side low-noise amplifier module, the signals enter a downlink full-capture receiver at the coaxial side, wherein the receiver comprises a variable gain amplifier I which adjusts the received signals to the level suitable for an analog-to-digital converter ADC, then the analog-to-digital converter ADC samples the signals, and the frequency division multiplexing intermediate frequency downlink combined signals are digitized; then the digital processing unit processes the digital domain of the digitized intermediate frequency downlink combined signal, firstly adopts the digital filtering technology to process the intermediate frequency signal S of each channelIFi-DL(i ═ 1, 2,. said, m) is isolated; considering that the rf transceiver on the antenna side is a zero-if architecture, the digital processing unit needs to digitize the separated if downlink signals S of each channelIFi-DL(i 1, 2.. multidata., m) to obtain the downstream I, Q digital signal of the channel, and then to perform necessary digital filtering, flatness correction and gain adjustment, etc. to send the I, Q digital signal to the antennaThe rf transmitter on the side (since the zero if architecture is adopted, the processing method can be referred to as the zero if transmitter on the antenna side in embodiment 1). The RF transmitter is responsible for converting the downstream I, Q digital signal into an analog RF carrier signal S(RF-DL)i，(i＝1，2，...，m)。
Note: the intermediate frequency signal S may also be subjected to a digital domain quadrature down-conversionIFi-DL(i 1, 2.. times.m) digital domain flatness correction and gain adjustment are performed.
For uplink, considering that the rf receiver on the antenna side is of a zero-if architecture (since the zero-if architecture is adopted, the processing method can be referred to the zero-if receiver on the antenna side in embodiment 1), the rf receiver will transmit the rf uplink signal S on the channel where the rf receiver is located(RF-UL)i(i ═ 1, 2.. multidot.m) is converted into a zero intermediate frequency uplink I, Q digital signal and is transmitted to a digital processing unit; the digital processing unit performs necessary filtering, flatness correction and gain adjustment on the signals and then performs digital domain orthogonal up-conversion to obtain a digitized intermediate frequency uplink signal S of a channel where the signals areIFi-UL(i ═ 1, 2,. ·, m); then the digital processing unit gathers the intermediate frequency uplink signals of each channel for combination to obtain a digitized frequency division multiplexing intermediate frequency uplink combination signal sigma (S)IF1-UL， SIF2-UL，...，SIFm-UL) And sending the signal to a digital-to-analog converter DAC of a coaxial full-spectrum transmitter for digital-to-analog conversion, and converting the signal into an analog frequency division multiplexing intermediate frequency uplink combined signal sigma (S)IF1-UL，SIF2-UL，...，SIFm-UL) (ii) a The full-spectrum transmitter also comprises a second variable gain amplifier which is used for providing proper driving level for a subsequent coaxial side power amplification module. And the output of the coaxial side power amplifier module feeds the amplified frequency division multiplexing intermediate frequency uplink combined signal to a coaxial port through a coaxial side duplexer.
Note: after digital domain quadrature upconversion, the intermediate frequency signal S may also be subjected toIFi-UL(i 1, 2.., m) performing flatness correction and gain adjustment.
In this embodiment, the relationship between the NCO signals in the digital processing unit and the respective intermediate frequency is:
fIFi_DL＝fNCOi_IF_DL，(i＝1，2，...，m)
fIFi_UL＝fNCOi_IF_UL，(i＝1，2，...，m)
the relationship between the local oscillator signal at the antenna side and the radio frequency is as follows:
fRF_DL＝fLO_RF_DL
fRF_UL＝fLO_RF_UL
if the communication system is in TDD operation mode, then
fIFi_DL＝fIFi_UL＝fNCOi_IF_DL＝fNCOi_IF_UL，(i＝1，2，...，m)
fRF_DL＝fRF_UL＝fLO_RF_DL＝fLO_RF_UL。
Example 3
In view of the rapid development of the high-speed analog-to-digital/digital-to-analog conversion technology, direct sampling can be realized at a radio frequency with a very high frequency. Therefore, on the basis of embodiment 2 of the present invention, the radio frequency downlink transmitter and the radio frequency uplink receiver (i.e., the antenna side transmitter and the antenna side receiver) on the antenna side are both changed to "direct sampling" (direct sampling) "type, so as to further simplify the digital multichannel signal far-end frequency conversion device. The schematic diagram of the digital multichannel signal far-end frequency conversion device in embodiment 3 of the present invention, referring to fig. 5, provides a digital multichannel signal far-end frequency conversion device that uses a full capture analog-to-digital conversion mode on the coaxial side and uses a radio frequency direct recovery transmitter on the antenna side.
In embodiment 3 of the present invention, the same full capture receiver and full spectrum transmitter as those in embodiment 2 of the present invention are used on the coaxial side, and the working principle is completely the same as that in embodiment 2 of the present invention, and details are not described here.
For downlink, frequency division multiplexing intermediate frequency downlink combined signal sigma (S)IF1-DL，SIF2-DL，...，SIFm-DL) The digital signals are digitized by a full capture receiver at the coaxial side and then enter a digital processing unit; the digital processing unit still first adopts the numberWord filtering technique for filtering intermediate frequency signals S of respective channelsIFi-DL(i 1, 2.. multidot.m) is extracted, but since a direct-sampling transceiver is used on the antenna side, the digital domain of the transceiver is used for the digitized intermediate-frequency signal SIFi-DLWill vary.
Because the radio frequency transceiver at the antenna side is a radio frequency direct sampling framework, the transmitting channel directly performs digital-to-analog conversion on the digitized radio frequency carrier to obtain an analog radio frequency carrier. Therefore, the digital processing unit separates the intermediate frequency signal S of each channelIFi-DLAfter (i ═ 1, 2.. multidot.m), digital mixing is performed, with a frequency of fIFi-DL(i 1, 2.. multidot.m) intermediate frequency signal, shifted to frequency fRF-DLThen the necessary filtering, flatness correction and gain adjustment are carried out on the radio frequency carrier wave, and the radio frequency carrier wave is sent to a radio frequency direct acquisition transmitter at the antenna side for digital-to-analog conversion, and is converted into an analog radio frequency carrier wave signal S(RF-DL)i，(i＝1， 2，...，m)。
Note: the intermediate frequency signal S may also be applied before digital mixingIFi-DL(i 1, 2.., m) performing flatness correction and gain adjustment.
In the same way, for the uplink, the radio frequency direct acquisition receiver at the antenna side transmits the radio frequency uplink signal S of the channel where the radio frequency direct acquisition receiver is positioned(RF-DL)iDirectly carrying out analog-digital sampling to obtain a digitized radio frequency uplink signal of a channel; the digital processing unit performs digital mixing on the frequency of the mixed signal to obtain a frequency fRF-DLThe digitized radio frequency uplink signal is shifted to fIFi-DL(i 1, 2.. said, m) forming a digitized intermediate frequency uplink signal S at an intermediate frequencyIFi-UL(i ═ 1, 2,. ·, m); after necessary filtering, flatness correction and gain adjustment, the digital processing unit gathers the digitized intermediate frequency uplink signals of each channel for combining to obtain a digitized frequency division multiplexing intermediate frequency uplink combined signal sigma (S)IF1-UL，SIF2-UL，...，SIFm-UL) And then the signals are sent to a full-spectrum transmitter at the coaxial side for digital-to-analog conversion, and are converted into frequency division multiplexing intermediate frequency uplink combined signal sigma (S) in an analog formIF1-UL，SIF2-UL，...，SIFm-UL) (ii) a And then the signal is fed to a coaxial port after passing through a coaxial side power amplifier module and a coaxial side duplexer.
Note: the radio frequency signal S may also be subjected to digital mixing(RF-DL)iAnd (i 1, 2.., m) performing flatness correction and gain adjustment.
As can be seen from the above technical contents, the corresponding processing software and method adopted by the present invention can be reasonably derived by those skilled in the art according to the specific structure of the digital multichannel signal remote frequency conversion apparatus of the present invention, and belong to the prior art (for example, "flatness correction and gain adjustment" and the like are all existing mature technologies, even when a chip manufacturer purchases a required chip, a corresponding software will be given), which is not the protection scope of the present invention.

Claims (10)

1. A digital multi-channel signal far-end frequency conversion device comprises an FDM combiner/splitter, a coaxial port, at least two antennas and communication channels with the same number as the antennas, wherein the coaxial port is connected with the combiner end of the FDM combiner/splitter, each splitter end of the FDM combiner/splitter is respectively connected with one communication channel in a one-to-one correspondence manner, each communication channel is respectively connected with each antenna in a one-to-one correspondence manner, the coaxial port is used for being connected with a near-end main unit, and the digital multi-channel far-end frequency conversion device is characterized in that aiming at any communication channel, the digital multi-channel far-end frequency conversion device comprises a coaxial side duplexer, a coaxial side downlink channel, a coaxial side uplink channel, a digital processing module, an antenna side downlink channel, an antenna side uplink channel and an antenna side duplexer, the digital processing module comprises a coaxial side input interface, a coaxial side output interface, an antenna side input interface and an antenna side output interface, and a common end of the coaxial side duplexer is connected with the splitter end corresponding to the FDM combiner/splitter, the output end of the antenna side duplexer is connected with the input end of the antenna side uplink channel, the input end of the antenna side downlink channel is connected with the output end of the digital processing module, the output end of the antenna side uplink channel is connected with the input end of the antenna side downlink channel, the input end of the antenna side uplink channel is connected with the output end of the digital processing module, the common end of the antenna side duplexer is connected with a corresponding antenna, the output end of the antenna side duplexer is connected with the input end of the antenna side uplink channel, the input end of the antenna side uplink channel is connected with the output end of the antenna side downlink channel, the input end of the antenna side downlink channel is connected with the antenna side output interface of the digital processing module, and the output end of the antenna side uplink channel is connected with the antenna side input interface of the digital processing module;
the coaxial side downlink channel at least comprises a coaxial side receiver, wherein the input end and the output end of the coaxial side receiver are respectively used as the input end and the output end of the coaxial side downlink channel; the coaxial side uplink channel at least comprises a coaxial side transmitter, wherein the input end and the output end of the coaxial side transmitter are respectively used as the input end and the output end of the coaxial side uplink channel; the antenna side downlink channel at least comprises an antenna side transmitter, wherein the input end and the output end of the antenna side transmitter are respectively used as the input end and the output end of the antenna side downlink channel; the antenna side uplink channel at least comprises an antenna side receiver, the input end and the output end of the antenna side receiver are respectively used as the input end and the output end of the antenna side uplink channel, the antenna side receiver at least comprises an antenna side analog-to-digital conversion module, and the input end and the output end of the antenna side analog-to-digital conversion module are respectively used as the input end and the output end of the antenna side uplink channel.
2. The digitized multi-channel signal remote frequency conversion apparatus according to claim 1, wherein the coaxial downstream channel further comprises a coaxial low noise amplifier module, an input of the coaxial low noise amplifier module being an input of the coaxial downstream channel, an output of the coaxial low noise amplifier module being connected to an input of a coaxial receiver, an output of the coaxial receiver being an output of the coaxial downstream channel;
the antenna side downlink channel also comprises an antenna side power amplification module, the input end of the antenna side sender is used as the input end of the antenna side downlink channel, the output end of the antenna side sender is connected with the input end of the antenna side power amplification module, and the output end of the antenna side power amplification module is used as the output end of the antenna side downlink channel;
the antenna side uplink channel also comprises an antenna side low-noise amplification module, wherein the input end of the antenna side low-noise amplification module is used as the input end of the antenna side uplink channel, the output end of the antenna side low-noise amplification module is connected with the input end of an antenna side receiver, and the output end of the antenna side receiver is used as the output end of the antenna side uplink channel;
the coaxial side uplink channel further comprises a coaxial side power amplifier module, the input end of the coaxial side transmitter is used as the input end of the coaxial side uplink channel, the output end of the coaxial side transmitter is connected with the input end of the coaxial side power amplifier module, and the output end of the coaxial side power amplifier module is used as the output end of the coaxial side uplink channel.
3. The apparatus as claimed in any of claims 1-2, wherein the coaxial side receiver further comprises a coaxial side down converter, an input of the coaxial side down converter is used as an input of the coaxial side receiver, an output of the coaxial side down converter is connected to an input of the coaxial side analog-to-digital conversion module, and an output of the coaxial side analog-to-digital conversion module is used as an output of the coaxial side receiver; the antenna side transmitter further comprises an antenna side up-converter, wherein the input end of the antenna side digital-to-analog conversion module is used as the input end of the antenna side transmitter, the output end of the antenna side digital-to-analog conversion module is connected with the input end of the antenna side up-converter, and the output end of the antenna side up-converter is used as the output end of the antenna side transmitter; the antenna side receiver also comprises an antenna side down converter, wherein the input end of the antenna side down converter is used as the input end of the antenna side receiver, the output end of the antenna side down converter is connected with the input end of the antenna side analog-to-digital conversion module, and the output end of the antenna side analog-to-digital conversion module is used as the output end of the antenna side receiver; the coaxial side transmitter further comprises a coaxial side up-converter, the input end of the coaxial side digital-to-analog conversion module is used as the input end of the coaxial side transmitter, the output end of the coaxial side digital-to-analog conversion module is connected with the input end of the coaxial side up-converter, and the output end of the coaxial side up-converter is used as the output end of the coaxial side transmitter.
4. The digital multichannel signal remote frequency conversion device as claimed in any of claims 1-2, characterized in that said coaxial side receiver, antenna side transmitter, antenna side receiver and coaxial side transmitter all use a zero intermediate frequency architecture.
5. The digital multichannel signal far-end frequency conversion device according to any one of claims 1-2, wherein the coaxial side receiver further comprises a first variable gain amplifier, the first coaxial side analog-to-digital conversion module adopts a first coaxial side analog-to-digital converter, the first variable gain amplifier and the first coaxial side analog-to-digital converter form a first coaxial side radio frequency direct acquisition receiver, an output end of the first coaxial side analog-to-digital converter serves as an output end of the first coaxial side radio frequency direct acquisition receiver, an input end of the first coaxial side analog-to-digital converter is connected with an output end of the first variable gain amplifier, and an input end of the first variable gain amplifier serves as an input end of the first coaxial side radio frequency direct acquisition receiver;
the coaxial side transmitter further comprises a second variable gain amplifier, the coaxial side digital-to-analog conversion module adopts a coaxial side digital-to-analog converter, the second variable gain amplifier and the coaxial side digital-to-analog converter form a coaxial side radio frequency direct-mining transmitter, the input end of the coaxial side digital-to-analog converter is used as the input end of the coaxial side radio frequency direct-mining transmitter, the output end of the coaxial side digital-to-analog converter is connected with the input end of the second variable gain amplifier, and the output end of the second variable gain amplifier is used as the output end of the coaxial side radio frequency direct-mining transmitter;
the antenna side transmitter further comprises a variable gain amplifier III, the antenna side digital-to-analog conversion module adopts an antenna side digital-to-analog converter, the variable gain amplifier III and the antenna side digital-to-analog converter form the antenna side radio frequency direct mining transmitter, the input end of the antenna side digital-to-analog converter is used as the input end of the antenna side radio frequency direct mining transmitter, the output end of the antenna side digital-to-analog converter is connected with the input end of the variable gain amplifier III, and the output end of the variable gain amplifier III is used as the output end of the antenna side radio frequency direct mining transmitter;
the antenna side receiver further comprises a fourth variable gain amplifier, the antenna side analog-to-digital conversion module adopts a fourth antenna side analog-to-digital converter, the fourth variable gain amplifier and the fourth antenna side analog-to-digital converter form the antenna side radio frequency direct acquisition receiver, the output end of the fourth antenna side analog-to-digital converter is used as the output end of the antenna side radio frequency direct acquisition receiver, the input end of the fourth antenna side analog-to-digital converter is connected with the output end of the fourth variable gain amplifier, and the input end of the fourth variable gain amplifier is used as the input end of the antenna side radio frequency direct acquisition receiver.
6. The digital multichannel signal far-end frequency conversion device is characterized by comprising a coaxial port, a coaxial side communication channel, a digital processing unit, at least two antennas and antenna side communication channels with the same number as the antennas, wherein the digital processing unit comprises a coaxial side input interface, a coaxial side output interface and at least antenna side communication interfaces with the same number as the antennas, the antenna side communication interfaces comprise an antenna side input interface and an antenna side output interface, and the coaxial side communication channel comprises a coaxial side duplexer, a coaxial side downlink channel and a coaxial side uplink channel;
the system comprises a near-end main unit, a coaxial port, a coaxial side duplexer, a coaxial side communication interface, a digital processing unit, a coaxial side communication channel, a coaxial side communication interface and a plurality of antennas, wherein the coaxial port is used for being connected with the near-end main unit, the coaxial port is connected with a common end of the coaxial side duplexer, an output end of the coaxial side duplexer is connected with a coaxial side input interface of the digital processing unit through a coaxial side downlink channel, a coaxial side output interface of the digital processing unit is connected with an input end of the coaxial side duplexer through a coaxial side uplink channel, each antenna side communication interface of the digital processing unit corresponds to each antenna side communication channel and each antenna one by one, and each antenna side communication interface of the digital processing unit is connected with each corresponding antenna one by each antenna side communication channel corresponding to the antenna side communication interface;
the coaxial side downlink channel at least comprises a full-capture receiver, wherein the input end and the output end of the full-capture transmitter are respectively used as the input end and the output end of the coaxial side downlink channel; the coaxial side uplink channel at least comprises a full-spectrum transmitter, wherein the input end and the output end of the full-spectrum receiver are respectively used as the input end and the output end of the coaxial side uplink channel, the full-spectrum transmitter at least comprises a full-spectrum digital-to-analog conversion module, and the input end and the output end of the full-spectrum digital-to-analog conversion module are respectively used as the input end and the output end of the full-spectrum transmitter;
aiming at any antenna side communication channel, the antenna side communication channel comprises an antenna side downlink channel, an antenna side uplink channel and an antenna side duplexer, wherein a common end of the antenna side duplexer is connected with a corresponding antenna, an input end of the antenna side downlink channel is connected with an antenna side output interface of the corresponding antenna side communication end in the digital processing unit, an output end of the antenna side downlink channel is connected with an input end of the antenna side duplexer, an output end of the antenna side uplink channel is connected with an antenna side input interface of the corresponding antenna side communication end in the digital processing unit, and an input end of the antenna side uplink channel is connected with an output end of the antenna side duplexer;
the antenna side downlink channel at least comprises an antenna side transmitter, wherein the input end and the output end of the antenna side transmitter are respectively used as the input end and the output end of the antenna side downlink channel; the antenna side uplink channel at least comprises an antenna side receiver, the input end and the output end of the antenna side receiver are respectively used as the input end and the output end of the antenna side uplink channel, the antenna side receiver at least comprises an antenna side analog-to-digital conversion module, and the input end and the output end of the antenna side analog-to-digital conversion module are respectively used as the input end and the output end of the antenna side receiver.
7. The digitized multi-channel signal remote frequency conversion apparatus according to claim 6, wherein the coaxial downlink channel further comprises a coaxial low noise amplifier module, an input of the coaxial low noise amplifier module being an input of the coaxial downlink channel, an output of the coaxial low noise amplifier module being connected to an input of the full capture receiver, an output of the full capture transmitter being an output of the coaxial downlink channel;
the coaxial side uplink channel also comprises a coaxial side power amplifier module, wherein the output end of the coaxial side power amplifier module is used as the output end of the coaxial side uplink channel, the input end of the coaxial side power amplifier module is connected with the output end of the full-spectrum receiver, and the input end of the full-spectrum transmitter is used as the input end of the coaxial side uplink channel;
the antenna side downlink channel also comprises an antenna side power amplification module, the input end of the antenna side sender is used as the input end of the antenna side downlink channel, the output end of the antenna side sender is connected with the input end of the antenna side power amplification module, and the output end of the antenna side power amplification module is used as the output end of the antenna side downlink channel;
the antenna side uplink channel further comprises an antenna side low noise amplification module, the input end of the antenna side low noise amplification module is used as the input end of the antenna side uplink channel, the output end of the antenna side low noise amplification module is connected with the input end of the antenna side receiver, and the output end of the antenna side receiver is used as the output end of the antenna side uplink channel.
8. The digitized multi-channel signal remote frequency conversion apparatus according to any one of claims 6-7, wherein the antenna-side transmitter further comprises an antenna-side up-converter, an input of the antenna-side digital-to-analog conversion module being an input of the antenna-side transmitter, an output of the antenna-side digital-to-analog conversion module being connected to an input of the antenna-side up-converter, an output of the antenna-side up-converter being an output of the antenna-side transmitter;
the antenna side receiver also comprises an antenna side down converter, wherein the input end of the antenna side down converter is used as the input end of the antenna side receiver, the output end of the antenna side down converter is connected with the input end of the antenna side analog-to-digital conversion module, and the output end of the antenna side analog-to-digital conversion module is used as the output end of the antenna side receiver.
9. The apparatus according to any of claims 6-7, wherein the antenna side transmitter and the antenna side receiver are of zero intermediate frequency architecture.
10. The digital multichannel signal remote frequency conversion device according to any one of claims 6 to 7, wherein the antenna side transmitter further includes a third variable gain amplifier, the antenna side digital-to-analog conversion module employs an antenna side digital-to-analog converter, the third variable gain amplifier and the antenna side digital-to-analog converter constitute the antenna side radio frequency direct acquisition transmitter, an input end of the antenna side digital-to-analog converter serves as an input end of the antenna side radio frequency direct acquisition transmitter, an output end of the antenna side digital-to-analog converter is connected with an input end of the third variable gain amplifier, and an output end of the third variable gain amplifier serves as an output end of the antenna side radio frequency direct acquisition transmitter;
the antenna side receiver further comprises a fourth variable gain amplifier, the antenna side analog-to-digital conversion module adopts a fourth antenna side analog-to-digital converter, the fourth variable gain amplifier and the fourth antenna side analog-to-digital converter form the antenna side radio frequency direct acquisition receiver, the output end of the fourth antenna side analog-to-digital converter is used as the output end of the antenna side radio frequency direct acquisition receiver, the input end of the fourth antenna side analog-to-digital converter is connected with the output end of the fourth variable gain amplifier, and the input end of the fourth variable gain amplifier is used as the input end of the antenna side radio frequency direct acquisition receiver.
CN202121811355.0U 2021-08-04 2021-08-04 Digital multi-channel signal far-end frequency conversion device Active CN215420247U (en)

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