CN103117768B - Wireless transceiver - Google Patents
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- CN103117768B CN103117768B CN201310030366.9A CN201310030366A CN103117768B CN 103117768 B CN103117768 B CN 103117768B CN 201310030366 A CN201310030366 A CN 201310030366A CN 103117768 B CN103117768 B CN 103117768B
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Abstract
The invention discloses a wireless transceiver, comprising: the working frequency band at least covers a transmitting-receiving antenna and a transmitting-receiving selection switch of the 5725-5850 MHZ frequency band, and the transmitting-receiving antenna is connected with the transmitting-receiving selection switch; a receiving module for receiving the RF signal of 5725-5850 MHZ frequency band received by the receiving and transmitting antenna through the receiving and transmitting selection switch; the input end of the digital signal processing module is connected with the output end of the receiving module; the transmitting module is connected with the input end of the digital signal processing module and is used for converting the signal output by the digital signal processing module into a radio frequency signal in a 5725-5850 MHZ frequency band; and the frequency synthesizer is connected with the leading-out ends of the receiving module and the transmitting module and provides local oscillation signals for the receiving module and the transmitting module. The wireless transceiver can receive and transmit signals in the 5725-5850 MHZ frequency band, and improves the data transmission rate of wireless communication.
Description
Technical field
The present invention relates to wireless access wide band technology field, relate to a kind of wireless transmitter in particular.
Background technology
Along with the development of wireless communication technology, the range of application of broadband wireless access (BWA, Broadband WirelessAccess) technology is also increasingly extensive.Wireless access wide band technology is the combination of networking, broadband and wireless mobile telecommunication technology, and it in broadband access network, wirelessly provides broadband access technology to user efficient applications of wireless technology.
According to the coverage of radio communication, wireless access wide band technology can be divided into wireless personal local area network WPAN, WLAN (wireless local area network) WLAN, wireless MAN WMAN and wireless wide area network WWAN.Wherein, WPAN and WLAN is only applicable to short range data transmission, and the demand of large-capacity data transmission cannot be met, as the ZigBee technology based on WPAN technology, effective propagation path based on the short distance wireless communication technology of ZigBee technology is generally between 10-75 rice, and its transmission rate is also lower.Although and for being applied to WMAN and WLAN wireless communication technology and can realizing the transfer of data of long distance, transmission rate is lower, cannot meet the transfer of data of two-forty.
Therefore, those skilled in the art's technical problem in the urgent need to address is, how under the prerequisite ensureing transmission range, improves the transmission rate of Large Volume Data.
Summary of the invention
In view of this, the invention provides a kind of wireless transmitter, utilize this wireless transmitter to carry out radio communication, the transmission rate of Large Copacity input can be improved.
For achieving the above object, the invention provides following technical scheme: a kind of wireless transmitter, comprising: working frequency range at least covers dual-mode antenna and the receiving/transmission selection switch of 5725 ~ 5850MHZ frequency range, and described dual-mode antenna is connected with described receiving/transmission selection switch;
Received the receiver module of the radiofrequency signal of 5725 ~ 5850MHZ frequency range that described dual-mode antenna receives by described receiving/transmission selection switch, the input of described receiver module is connected with described receiving/transmission selection switch;
The digital signal processing module that input is connected with the output of described receiver module;
Input is connected with the output of described digital signal processing module, and the signal for being exported by digital signal processing module is converted to the transmitter module of the radiofrequency signal in 5725 ~ 5850MHZ frequency range, the output of described transmitter module is connected with described receiving/transmission selection switch;
Be connected with the exit of described receiver module with described transmitter module, and provide the frequency synthesizer of local oscillation signal for described receiver module and transmitter module.
Preferably, described receiver module comprises:
The radiofrequency signal pretreatment module that input is connected with described receiving/transmission selection switch;
The quadrature frequency conversion frequency mixer that radio-frequency (RF) signal input end is connected with the output of described radiofrequency signal pretreatment module, the local oscillation signal input of described quadrature frequency conversion frequency mixer is connected with described frequency synthesizer as the exit of described receiver module, and the local oscillation signal that the radiofrequency signal of described 5725 ~ 5850MHZ frequency range and described frequency synthesizer provide is carried out quadrature frequency conversion mixing by described quadrature frequency conversion frequency mixer, and be the analog baseband signal of 0 ~ 62.5MHZ from two output output frequency range;
The modulus process branch road that two-way is connected with two outputs of described quadrature frequency conversion frequency mixer respectively, described modulus process branch road carries out filtering to the analog baseband signal of described 0 ~ 62.5MHZ, and filtered described analog baseband signal is converted to digital signal exports to described digital signal processing module.
Preferably, the two ways of digital signals of input is converted to digital baseband signal by described digital signal processing module, and described two-way digital baseband signal is input to described transmitter module respectively by two output;
Described transmitter module comprises:
Two-way digital-to-analogue process branch road, the input of described digital-to-analogue process branch road is connected with the output of described digital signal processing module;
Two baseband signal inputs are connected with the output of described two-way digital-to-analogue process branch road respectively, and receive the quadrature up-conversion frequency mixer that frequency range that described digital-to-analogue process branch road changes out is the analog baseband signal of 0 ~ 62.5MHZ, the local oscillation signal input of described quadrature up-conversion frequency mixer is connected with described frequency synthesizer as the exit of described transmitter module, and the described quadrature up-conversion frequency mixer analog baseband signal that is 0 ~ 62.5MHZ by described two-way frequency range and described frequency synthesizer provide local oscillation signal to carry out up-conversion mixing;
Input is connected with the output of described quadrature up-conversion frequency mixer, and aligns the radiofrequency signal after handing in mixing that conversion mixer exports and carry out the radiofrequency signal output processing module that processes.
Preferably, described radiofrequency signal pretreatment module comprises:
Working frequency range at least covers 5725 ~ 5850MHZ frequency range, and to the low noise amplifier that the radiofrequency signal of 5725 ~ 5850MHZ frequency range that described dual-mode antenna receives is amplified, the input of described low noise amplifier is connected with one end of described receiving/transmission selection switch;
Input is connected with the output of described low noise amplifier, and centre frequency be 5787.5MHZ, bandwidth is first radio frequency band filter of 125MHZ.
Preferably, described modulus process branch road comprises:
The first low pass filter that input is connected with an output of described quadrature frequency conversion frequency mixer, and the output of described first low pass filter is connected with the input of the first variable gain amplifier;
The described output of the first variable gain amplifier is connected with the input of analog to digital converter, and the output of described analog to digital converter is connected with an input of described digital signal processing module.
Preferably, described digital-to-analogue process branch road comprises:
The digital to analog converter that input is connected with an output of described digital signal processing module;
The second variable gain amplifier that input is connected with the output of described digital to analog converter;
The second low pass filter that input is connected with the output of described second variable gain amplifier, the output of described second low pass filter is connected with a baseband signal input of described quadrature up-conversion frequency mixer.
Preferably, described radiofrequency signal output processing module, comprising:
Input is connected with the output of described quadrature up-conversion frequency mixer, and centre frequency be 5787.5MHZ, bandwidth is second radio frequency band filter of 125MHZ;
Input is connected with the output of described second radio frequency band filter, and working frequency range at least covers the power amplifier of 5725 ~ 5850MHZ frequency range, and the output of described power amplifier is connected with described receiving/transmission selection switch.
Preferably, described R-T unit also comprises: rf frequency synthesizer;
Described radiofrequency signal pretreatment module comprises:
Working frequency range at least covers 5725 ~ 5850MHZ frequency range, and to the low noise amplifier that the radiofrequency signal of 5725 ~ 5850MHZ frequency range that described dual-mode antenna receives is amplified, the input of described low noise amplifier is connected with one end of described receiving/transmission selection switch;
Input is connected with the output of described low noise amplifier, and centre frequency be 5787.5MHZ, bandwidth is first radio frequency band filter of 125MHZ;
The radio frequency down-conversion frequency mixer that first input end is connected with the output of described first radio frequency band filter, the second input of described radio frequency down-conversion frequency mixer is connected with the output of described rf frequency synthesizer;
The first intermediate frequency variable gain amplifier that input is connected with the output of described radio frequency down-conversion frequency mixer;
The first if bandpas filter that input is connected with the output of described intermediate frequency variable gain amplifier, the output of described if bandpas filter is connected with the input of described quadrature frequency conversion frequency mixer.
Preferably, described radiofrequency signal output processing module, comprising:
The second if bandpas filter that input is connected with the output of described quadrature up-conversion frequency mixer;
The second intermediate frequency variable gain filter that input is connected with described second if bandpas filter;
The RF up-converter frequency mixer that first input end is connected with described second intermediate frequency variable gain filter, the second input of described RF up-converter frequency mixer is connected with the output of described rf frequency synthesizer;
Input is connected with the output of described RF up-converter frequency mixer, and centre frequency be 5787.5MHZ, bandwidth is second radio frequency band filter of 125MHZ;
Input is connected with the output of described second radio frequency band filter, and working frequency range at least covers the power amplifier of 5725 ~ 5850MHZ frequency range, and the output of described power amplifier is connected with described receiving/transmission selection switch.
Preferably, described frequency synthesizer provides the local oscillation signal of 5787.5MHZ for described receiver module and described transmitter module.
Known via above-mentioned technical scheme, compared with prior art, present disclosure provides a kind of wireless transmitter, this wireless transmitter can receive radiofrequency signal in 5725MHZ ~ 5850MHZ frequency range, and be submitted to digital signal processing module after the radiofrequency signal in this frequency range being processed and process, the radiofrequency signal simultaneously generated can be propagated in 5725MHZ ~ 5850MHZ frequency range by antenna, thus transfer of data is carried out in this frequency range, can data transmission distance be ensured and can higher transmission rate be realized, thus achieve under the prerequisite ensureing transmission range, higher transmission rate can be had.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
Fig. 1 shows the structural representation of a kind of wireless transmitter of the present invention embodiment;
Fig. 2 shows the structural representation of a kind of another embodiment of wireless transmitter of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The embodiment of the invention discloses a kind of wireless transmitter, this wireless transmitter comprises: working frequency range at least covers dual-mode antenna and the receiving/transmission selection switch of 5725MHZ ~ 5850MHZ frequency range, and this dual-mode antenna is connected with described receiving/transmission selection switch; Received the receiver module of the radiofrequency signal of 5725 ~ 5850MHZ frequency range that this dual-mode antenna receives by this receiving/transmission selection switch, the input of described receiver module is connected with described receiving/transmission selection switch; The digital signal processing module that input is connected with the output of receiver module; Input is connected with the output of digital signal processing module, and the signal for being exported by digital signal processing module is converted to the transmitter module of the radiofrequency signal in 5725 ~ 5850MHZ frequency range, and the output of this transmitter module is connected with receiving/transmission selection switch; The frequency synthesizer be connected with the exit of transmitter module with this receiver module, this frequency synthesizer provides local oscillation signal for receiver module and transmitter module.Wireless transmitter of the present invention can receive radiofrequency signal in 5725MHZ ~ 5850MHZ frequency range, and be submitted to digital signal processing module after the radiofrequency signal in this frequency range being processed and process, the radiofrequency signal simultaneously generated can be propagated in 5725MHZ ~ 5850MHZ frequency range by antenna, and according to the transfer of data index met in 5725MHZ ~ 5850MHZ frequency range of national regulation, when carrying out transfer of data in this frequency range, under the prerequisite ensureing transmission range, higher transmission rate can be had.
Below in conjunction with accompanying drawing to wireless transmitter of the present invention, describe in detail.
See Fig. 1, show the structural representation of this kind of wireless transmitter of the present invention embodiment, in the present embodiment, this wireless transmitter comprises: dual-mode antenna 1, receiving/transmission selection switch 2, receiver module 3, transmitter module 4, frequency synthesizer 5 and digital signal processing module 6.
Wherein, the working frequency range of this dual-mode antenna 1 at least covers the frequency range of 5725MHZ ~ 5850MHZ.
This dual-mode antenna is connected with one end of receiving/transmission selection switch 2, and the other end of this receiving/transmission selection switch 2 is connected with the output of receiver module 3 and the input of transmitter module 4.This receiving/transmission selection switch switches for the work realizing receiver module and transmitter module, by setting this selector switch and the connecting and disconnecting of the circuit between receiver module and transmitter module, receiver module received RF signal can be controlled, or control the outside emitting radio frequency signal of transmitter module.
The exit of this receiver module 3 is all connected with frequency synthesizer 5 with the exit of transmitter module, and this frequency synthesizer provides local oscillation signal for this receiver module and transmitter module.
Wherein, this receiver module receives the radiofrequency signal of frequency range in 5725MHZ ~ 5850MHZ by dual-mode antenna, and process is carried out to the radiofrequency signal in this 5725MHZ ~ 5850MHZ frequency range generate analog baseband signal, and be sent to digital signal processor after analog baseband signal is converted to digital signal and process.
Transmitter module is then converted to the digital signal that digital signal processing module exports the radiofrequency signal being adapted at propagating in 5725-5850MHZ frequency range.
Wireless transmitter of the present invention is based on 5.8GHZ frequency range, the frequency range of open 5725MHZ ~ 5850MHZ is adopted to carry out reception, the transmission of radiofrequency signal, communication bandwidth 125MHZ, this R-T unit is meeting the Specifications of band frequency of 5725MHZ ~ 5850MHZ, transmission range can reach 1000m, transmission rate can reach 250mbps, achieves under the prerequisite meeting certain transmission range, improves transmission rate.
In the present invention, this receiver module 3 can comprise: radiofrequency signal pretreatment module 310, quadrature frequency conversion frequency mixer 320 and be connected to the two-way modulus process branch road 330 of two outputs of frequency mixer.
Wherein, the input of this radiofrequency signal pretreatment module 310 is connected with receiving/transmission selection switch 2, and its output is connected with the radio-frequency (RF) signal input end of this quadrature frequency conversion frequency mixer 320.After the radiofrequency signal of this radiofrequency signal pretreatment module to the 5725MHZ ~ 5850MHZ frequency range received carries out preliminary treatment, the radiofrequency signal through this 5725MHZ ~ 5850MHZ frequency range pretreated is outputted in quadrature frequency conversion frequency mixer.
This quadrature frequency conversion frequency mixer 320 comprises a radio-frequency (RF) signal input end, a local oscillation signal input and two outputs, and the local oscillation signal input of this quadrature frequency conversion frequency mixer is connected with frequency synthesizer 5 as the exit of this receiver module.The local oscillation signal that this frequency synthesizer 5 exports is input in this quadrature frequency conversion frequency mixer.The local oscillation signal that the radiofrequency signal of the 5725 ~ 5850MHZ frequency range after the process of radiofrequency signal pretreatment module and frequency synthesizer provide is carried out quadrature frequency conversion mixing by this quadrature frequency conversion frequency mixer, obtain the analog baseband signal that two-way frequency range is 0 ~ 62.5MHZ (i.e. DC ~ 62.5MHZ), and the two-way analog baseband signal obtained is outputted to this two-way modulus process branch road 330 from two output respectively.
This two-way modulus process branch road 330 is connected with two outputs of quadrature up-conversion frequency mixer respectively.Each road modulus process branch road all aligns to be handed in the analog baseband signal of 0 ~ 62.5MHZ that conversion mixer exports and carries out the process such as filtering, and the described analog baseband signal after filtering process is converted to digital signal exports to digital signal processing module.
Accordingly, this digital signal processing module 6 is after the analog baseband signal receiving the input of two-way modulus process branch road, process is carried out to this two-way analog baseband signal and is converted to digital baseband signal, and by this two-way digital baseband signal respectively by two output input transmitter module.
Wherein, this transmitter module has two inputs, and two inputs of transmitter module are connected with two outputs of digital signal processing module respectively.
Concrete, this transmitter module can comprise: two-way digital-to-analogue process branch road 410, quadrature up-conversion frequency mixer 420 and radiofrequency signal output processing module 430.
Wherein, the input of this two-way digital-to-analogue process branch road 410 is connected with two outputs of digital signal processing module respectively.This digital-to-analogue process branch road is for receiving the digital baseband signal exported from digital signal processing module, and digital baseband signal is converted to the analog baseband signal of frequency range at 0 ~ 62.5MHZ, and the analog baseband signal be converted to is input in quadrature up-conversion frequency mixer.Concrete, this digital-to-analogue process branch road is converted to analog baseband signal to this digital baseband signal, and carries out the operations such as gain amplification, filtering to this analog baseband signal.
This quadrature up-conversion frequency mixer 420 has two baseband signal inputs, a local oscillation signal input and an output.Two baseband signal inputs of this quadrature up-conversion frequency mixer are connected with the output of this two-way digital-to-analogue process branch road respectively, and to receive the frequency range that digital-to-analogue process branch road changes out be the analog baseband signal of 0 ~ 62.5MHZ.The local oscillation signal input of this quadrature up-conversion frequency mixer is connected with this frequency synthesizer as the exit of this transmitter module, and is input in this quadrature up-conversion frequency mixer by the local oscillation signal that frequency synthesizer produces by this local oscillation signal input.The frequency range that two baseband signal inputs input is that the local oscillation signal that the analog baseband signal of 0 ~ 62.5MHZ and local oscillation signal input input carries out up-conversion mixing by this quadrature up-conversion frequency mixer, produces the radiofrequency signal of 5725 ~ 5850MHZ frequency range and outputs to radiofrequency signal output processing module.
The input of this radiofrequency signal output processing module 430 is connected with the output of this quadrature up-conversion frequency mixer, and the radiofrequency signal that this radiofrequency signal output processing module aligns the output 5725 ~ 5850MHZ frequency range handing in conversion mixer output processes.As this radiofrequency signal output processing module can carry out power amplification to the radiofrequency signal of 5725 ~ 5850MHZ frequency range that this quadrature up-conversion frequency mixer exports, and the operation such as filtering.
In actual applications, according to the difference of application scenarios, the concrete composition of the receiver module in this wireless transmitter and transmitter module may also can be different.
Wireless transmitter in the embodiment shown in fig. 1 can meet and there is not DC maladjustment or reduce the condition of DC maladjustment, in that case in the present embodiment this frequency synthesizer for the local oscillation signal that receiver module and transmitter module provide be the local oscillation signal of 5787.5MHZ.
This receiver module 3 comprises in the present embodiment: radiofrequency signal pretreatment module 310, quadrature up-conversion frequency mixer 320 and two-way modulus process branch road 330.
Concrete, this radiofrequency signal pretreatment module 310 can comprise: working frequency range at least covers 5725 ~ 5850MHZ frequency range, and the low noise amplifier 311 that the radiofrequency signal of 5725 ~ 5850MHZ frequency range that dual-mode antenna receives is amplified and centre frequency be 5787.5MHZ, bandwidth is first radio frequency band filter 312 of 125MHZ.
Wherein, the input of this low noise amplifier 311 is connected with one end of receiving/transmission selection switch, when this receiving/transmission selection switch is in conducting state, this low noise amplifier can receive the radiofrequency signal of 5725 ~ 5850MHZ frequency range that dual-mode antenna receives, and this radiofrequency signal is amplified, and reduce the noise introduced, to improve the signal to noise ratio of this signal.
The output of this low noise amplifier 311 is connected with the input of this first radio frequency band filter 312., and then radiofrequency signal in the 5725 ~ 5850MHZ frequency range after amplification is input in this first radio frequency band filter 312 by this low noise amplifier 311.The centre frequency of this first radio frequency band filter 312 is 5787.5MHZ, bandwidth is 125MHZ, therefore can carry out filtering process, with the interference signal outside filtering 5725 ~ 5850MHZ frequency range to the radiofrequency signal of input.
The output of this first radio frequency band filter 312 is connected with the radio-frequency (RF) signal input end of this quadrature up-conversion frequency mixer 32.The local oscillation signal of the radiofrequency signal that radio-frequency (RF) signal input end inputs by this quadrature frequency conversion frequency mixer 320 and the 5787.5MHZ that this frequency synthesizer provides carries out quadrature frequency conversion mixing, produce the low-frequency analog baseband signal of two-way, the frequency range of the analog baseband signal of generation is 0 ~ 62.5MHZ and DC ~ 62.5MHZ.Wherein, this quadrature frequency conversion frequency mixer receives after frequency synthesizer is input to local oscillation signal, this local oscillation signal is divided into two-way, down-conversion mixing is carried out with the radiofrequency signal of input in one tunnel after 90 degree of phase shift process, another road local oscillation signal then direct and radiofrequency signal carries out down-conversion mixing, thus produce homophase and orthogonal two-way analog baseband signal, namely obtain I, Q two-way analog baseband signal.
I, Q two-way analog baseband signal that this quadrature up-conversion frequency mixer produces is input in two-way modulus process branch road 330 respectively.Every road modulus process branch road 330 can comprise in the present embodiment: the first low pass filter 331, first variable gain amplifier 332 and analog to digital converter 333.
The input of this first low pass filter 331 is connected with an output of quadrature frequency conversion frequency mixer, for receiving the road analog baseband signal that this quadrature frequency conversion frequency mixer 320 exports.
The output of this first low pass filter 331 is connected with the input of this first variable gain amplifier 332, and the output of this first variable gain amplifier 332 is connected with the input of this analog to digital converter 333, the output of this analog to digital converter is connected with an input of this digital signal processing module 6.
Wherein, the passband of this first low pass filter is 0 ~ 62.5MHZ, for being filtered by the analog baseband signal after mixing, with filter out-band external signal.
The bandwidth of this first variable gain amplifier at least covers 0 ~ 62.5MHZ frequency range, for being amplified by filtered analog baseband signal, to meet the requirement of analog to digital converter incoming level.This first variable gain amplifier can regulate gain amplifier according to the signal power received.
This analog to digital converter then by after filtering, amplify after analog baseband signal be converted to digital signal, to be supplied to digital signal processing module carrying out Digital Signal Processing.
Accordingly, send propagation to realize utilizing 5725 ~ 5850MHZ frequency range to carry out radiofrequency signal, the digital baseband signal that this digital signal processing module is exported is input to this receiver module.This digital signal processing module exports two-way digital baseband signal simultaneously in the present embodiment, i.e. I, Q two-way digital baseband signal, and this two-way digital baseband signal is input in the two-way digital-to-analogue process branch road of this receiver module respectively.Concrete, this transmitter module 4 comprises: two-way digital-to-analogue process branch road 410, quadrature up-conversion frequency mixer 420 and radiofrequency signal output processing module 430.In the present embodiment, every way mould process branch road 410 includes: digital to analog converter 411, second variable gain amplifier 412 and the second low pass filter 413.
The input of this digital to analog converter 411 is connected with an output of this digital signal processor 6, and the output of this digital to analog converter 411 is connected with the input of this second variable gain amplifier 412; The output of this second variable gain amplifier 412 is connected with the input of this second low pass filter 413, and the output of this second low pass filter is connected with an input of this quadrature up-conversion frequency mixer.
Wherein, this digital to analog converter 411, is converted to analog baseband signal for the digital baseband signal exported by digital signal processing module.
The bandwidth of operation of this second variable gain amplifier at least covers 0 ~ 62.5MHZ, and it carries out power amplification to the analog baseband signal of input, adjusts the gain amplifier of this analog baseband signal, to meet the requirement of transmitter module transmitting power.
The passband of this second low pass filter is 0 ~ 62.5MHZ, and it is for carrying out filtering by the analog baseband signal after the amplification of input, with filter out-band external signal.
The two-way digital baseband signal that digital signal processing module exports in the present embodiment is input in quadrature up-conversion frequency mixer after each element process in digital-to-analogue process branch road.
The 5787.5MHZ local oscillation signal that input I, Q two-way analog baseband signal and frequency synthesizer 5 provide is carried out quadrature up-conversion mixing by this quadrature up-conversion frequency mixer 420, produce the radiofrequency signal of 5725MHZ ~ 5850MHZ frequency range, and output in radiofrequency signal output processing module 430.
This radiofrequency signal output processing module 430 specifically comprises in the present embodiment: the second radio frequency band filter 431 and power amplifier 432.
The input of this second radio frequency band filter is connected with the output of this quadrature up-conversion frequency mixer, and its output is connected with the input of this power amplifier, and the output of this power amplifier is then connected with receiving/transmission selection switch.
Wherein, the centre frequency of this second radio frequency band filter is 5787.5MHZ, bandwidth is 125MHZ, and it carries out filtering process, with the interference signal outside filtering 5725 ~ 5850MHZ frequency range for aligning the radiofrequency signal handing in 5725MHZ ~ 5850MHZ frequency range that conversion mixer exports.
The working frequency range of this power amplifier at least covers 5725 ~ 5850MHZ frequency range, for carrying out power amplification to the radiofrequency signal of this 5725 ~ 5850MHZ frequency range filtered, to meet the needs of transmitting power.
Suppress problem to reduce mirror image, present invention also offers a kind of wireless transmitter, show the structural representation of a kind of another embodiment of wireless transmitter of the present invention see Fig. 2, the present embodiment and difference embodiment illustrated in fig. 1 are:
This wireless transmitter also comprises rf frequency synthesizer 7 in the present embodiment, and this rf frequency synthesizer provides radio-frequency (RF) local oscillator signal for receiver module and transmitter module.
Accordingly, this frequency synthesizer 5 is to be IF-FRE synthesizer in the present embodiment, for this receiver module and transmitter module provide intermediate frequency local oscillator signal.Wherein, the frequency range of the intermediate frequency local oscillator signal that this frequency synthesizer provides can set as required, but all to ensure that the analog baseband signal frequency range that receiver module is changed out is 0 ~ 62.5MHZ, and need ensure that the frequency range of the radiofrequency signal that transmitter module is changed out is 5725 ~ 5850MHZ.
Correspondingly, in the present embodiment, the radiofrequency signal pretreatment module 310 connect in this receiver module 3 at least covers 5725 ~ 5850MHZ frequency range except comprising working frequency range, and to the low noise amplifier 311 that the radiofrequency signal of 5725 ~ 5850MHZ frequency range that dual-mode antenna receives is amplified, and centre frequency be 5787.5MHZ, bandwidth is outside first radio frequency band filter 312 of 125MHZ, also comprise: radio frequency down-conversion frequency mixer 313, first intermediate frequency variable gain amplifier 314 and if bandpas filter 315.
Wherein, function and its annexation of this low noise amplifier 311 and the first radio frequency band filter are identical with embodiment illustrated in fig. 2, and only the output of this first radio frequency band filter is connected with the first input end of radio frequency down-conversion frequency mixer 313 in the present embodiment.
This radio frequency down-conversion frequency mixer 313 has two inputs, and its first input end is connected with the output of the first radio frequency band filter, and its second input is connected with the output of this rf frequency synthesizer.This radio frequency down-conversion frequency mixer is used for first input end being input to the radio-frequency (RF) local oscillator signal inputted through amplification, filtered radiofrequency signal and this rf frequency synthesizer and carries out down-conversion mixing, and the bandwidth producing intermediate frequency is the signal of 125MHZ.
The output of this radio frequency down-conversion frequency mixer 313 is connected with the input of this first intermediate frequency variable gain amplifier 314, and the output of this first intermediate frequency variable gain amplifier 314 is connected with the input of this if bandpas filter 315, the output of this if bandpas filter 315 is connected with the input of this quadrature frequency conversion frequency mixer 320.
Wherein, the bandwidth of operation of this first intermediate frequency variable gain amplifier is at least 125MHZ, and its bandwidth for the intermediate frequency exported by radio frequency down-conversion frequency mixer is that the signal of 125MHZ amplifies, to meet the requirement of analog to digital converter incoming level.
The pass band width of this if bandpas filter is 125MHZ, for being that the signal of 125MHZ carries out filtering, with filter out-band external signal by the bandwidth of this intermediate frequency.
In fact this quadrature frequency conversion frequency mixer 320 can be understood as with intermediate frequency quadrature down-conversion mixer in the present embodiment, its for after filtering, amplify, signal that the bandwidth of intermediate frequency that obtains after intermediate frequency mixing is 125MHZ and the intermediate frequency local oscillator signal that this frequency synthesizer 5 provides carry out quadrature frequency conversion mixing, and export the analog baseband signal that I, Q two-way frequency range is 0 ~ 62.5MHZ.
Accordingly, be in transmitter module one end and difference embodiment illustrated in fig. 2:
After the intermediate frequency local oscillator signal that the analog baseband signal of I, Q two-way 0 ~ 62.5MHZ frequency range of input and frequency synthesizer provide is carried out quadrature up-conversion mixing by the quadrature up-conversion frequency mixer in transmitter module, the bandwidth producing intermediate frequency is the signal of 125MHZ.
Further, radiofrequency signal output processing module 430 in this transmitter module the second radio frequency band filter 431 that centre frequency is 5787.5MHZ except comprising, bandwidth is 125MHZ and working frequency range at least cover except 5725 ~ 5850MHZ band power amplifier 432, also comprise: the second if bandpas filter 433, second intermediate frequency variable gain filter 434 and RF up-converter frequency mixer 435.
The input of this second if bandpas filter 431 is connected with the output of this quadrature up-conversion frequency mixer in the present embodiment, carries out filtering for the signal after the mixing that exported by quadrature up-conversion frequency mixer.The pass band width of this second if bandpas filter is 125MHZ.
The input of this second intermediate frequency variable gain filter 434 is connected with the output of this second if bandpas filter 431, and the output of this second intermediate frequency variable gain filter is connected with the first input end of this RF up-converter frequency mixer 435.The bandwidth of operation of this second intermediate frequency variable gain filter is at least 125NHZ, and it regulates the bandwidth of the intermediate frequency of input to be the gain amplifier of the signal of 125MHZ according to the watt level that transmits.
Second input of this RF up-converter frequency mixer is connected with this rf frequency synthesizer, the signal that the bandwidth of the intermediate frequency that first input end inputs by this rf frequency synthesizer is 125MHZ and the radio-frequency (RF) local oscillator signal that rf frequency synthesizer provides carry out up-conversion mixing, produce the radiofrequency signal of 5725 ~ 5850MHZ frequency range.
The output of this RF up-converter frequency mixer is connected with the input of this second radio frequency band filter 431, and the output of this second radio frequency band filter 431 is connected with the input of this power amplifier 432, the output of this power amplifier is connected with receiving/transmission selection switch 2.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (5)
1. a wireless transmitter, is applied in broadband access network, it is characterized in that, comprising: working frequency range at least covers dual-mode antenna and the receiving/transmission selection switch of 5725 ~ 5850MHZ frequency range, and described dual-mode antenna is connected with described receiving/transmission selection switch;
Received the receiver module of the radiofrequency signal of 5725 ~ 5850MHZ frequency range that described dual-mode antenna receives by described receiving/transmission selection switch, the input of described receiver module is connected with described receiving/transmission selection switch;
The digital signal processing module that input is connected with the output of described receiver module;
Input is connected with the output of described digital signal processing module, and the signal for being exported by digital signal processing module is converted to the transmitter module of the radiofrequency signal in 5725 ~ 5850MHZ frequency range, the output of described transmitter module is connected with described receiving/transmission selection switch;
Be connected with the exit of described receiver module with described transmitter module, and provide the frequency synthesizer of local oscillation signal for described receiver module and transmitter module;
Wherein, described receiver module comprises:
The radiofrequency signal pretreatment module that input is connected with described receiving/transmission selection switch;
The quadrature frequency conversion frequency mixer that radio-frequency (RF) signal input end is connected with the output of described radiofrequency signal pretreatment module, the local oscillation signal input of described quadrature frequency conversion frequency mixer is connected with described frequency synthesizer as the exit of described receiver module, and the local oscillation signal that the radiofrequency signal of described 5725 ~ 5850MHZ frequency range and described frequency synthesizer provide is carried out quadrature frequency conversion mixing by described quadrature frequency conversion frequency mixer, and be the analog baseband signal of 0 ~ 62.5MHZ from two output output frequency range;
The modulus process branch road that two-way is connected with two outputs of described quadrature frequency conversion frequency mixer respectively, described modulus process branch road carries out filtering to the analog baseband signal of described 0 ~ 62.5MHZ, and filtered described analog baseband signal is converted to digital signal exports to described digital signal processing module;
Described R-T unit also comprises: rf frequency synthesizer;
Described radiofrequency signal pretreatment module comprises:
Working frequency range at least covers 5725 ~ 5850MHZ frequency range, and to the low noise amplifier that the radiofrequency signal of 5725 ~ 5850MHZ frequency range that described dual-mode antenna receives is amplified, the input of described low noise amplifier is connected with one end of described receiving/transmission selection switch;
Input is connected with the output of described low noise amplifier, and centre frequency be 5787.5MHZ, bandwidth is first radio frequency band filter of 125MHZ;
The radio frequency down-conversion frequency mixer that first input end is connected with the output of described first radio frequency band filter, the second input of described radio frequency down-conversion frequency mixer is connected with the output of described rf frequency synthesizer;
The first intermediate frequency variable gain amplifier that input is connected with the output of described radio frequency down-conversion frequency mixer;
The first if bandpas filter that input is connected with the output of described intermediate frequency variable gain amplifier, the output of described if bandpas filter is connected with the input of described quadrature frequency conversion frequency mixer;
Described radiofrequency signal output processing module, comprising:
The second if bandpas filter that input is connected with the output of described quadrature up-conversion frequency mixer;
The second intermediate frequency variable gain filter that input is connected with described second if bandpas filter;
The RF up-converter frequency mixer that first input end is connected with described second intermediate frequency variable gain filter, the second input of described RF up-converter frequency mixer is connected with the output of described rf frequency synthesizer;
Input is connected with the output of described RF up-converter frequency mixer, and centre frequency be 5787.5MHZ, bandwidth is second radio frequency band filter of 125MHZ;
Input is connected with the output of described second radio frequency band filter, and working frequency range at least covers the power amplifier of 5725 ~ 5850MHZ frequency range, and the output of described power amplifier is connected with described receiving/transmission selection switch.
2. R-T unit according to claim 1, it is characterized in that, the two ways of digital signals of input is converted to digital baseband signal by described digital signal processing module, and described two-way digital baseband signal is input to described transmitter module respectively by two output;
Described transmitter module comprises:
Two-way digital-to-analogue process branch road, the input of described digital-to-analogue process branch road is connected with the output of described digital signal processing module;
Two baseband signal inputs are connected with the output of described two-way digital-to-analogue process branch road respectively, and receive the quadrature up-conversion frequency mixer that frequency range that described digital-to-analogue process branch road changes out is the analog baseband signal of 0 ~ 62.5MHZ, the local oscillation signal input of described quadrature up-conversion frequency mixer is connected with described frequency synthesizer as the exit of described transmitter module, and the described quadrature up-conversion frequency mixer analog baseband signal that is 0 ~ 62.5MHZ by described two-way frequency range and described frequency synthesizer provide local oscillation signal to carry out up-conversion mixing;
Input is connected with the output of described quadrature up-conversion frequency mixer, and aligns the radiofrequency signal after handing in mixing that conversion mixer exports and carry out the radiofrequency signal output processing module that processes.
3. R-T unit according to claim 1 and 2, is characterized in that, described modulus process branch road comprises:
The first low pass filter that input is connected with an output of described quadrature frequency conversion frequency mixer, and the output of described first low pass filter is connected with the input of the first variable gain amplifier;
The described output of the first variable gain amplifier is connected with the input of analog to digital converter, and the output of described analog to digital converter is connected with an input of described digital signal processing module.
4. R-T unit according to claim 2, is characterized in that, described digital-to-analogue process branch road comprises:
The digital to analog converter that input is connected with an output of described digital signal processing module;
The second variable gain amplifier that input is connected with the output of described digital to analog converter;
The second low pass filter that input is connected with the output of described second variable gain amplifier, the output of described second low pass filter is connected with a baseband signal input of described quadrature up-conversion frequency mixer.
5. R-T unit according to claim 1, is characterized in that, described frequency synthesizer provides the local oscillation signal of 5787.5MHZ for described receiver module and described transmitter module.
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