CN103117768A - Wireless transceiver - Google Patents
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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 the wireless access wide band technology field, relate in particular a kind of wireless transmitter.
Background technology
Along with the development of wireless communication technology, the range of application of broadband wireless access (BWA, Broadband Wireless Access) 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, provides broadband access technology efficient applications of wireless technology with wireless mode to the user.
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 are only applicable to the short-range data transmission, and can't satisfy the demand of Large Volume Data transmission, as the ZigBee technology based on the 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 the transfer of data that is applied to WMAN and WLAN wireless communication technology and can realizes long distance, transmission rate is lower, can't satisfy 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 that guarantees 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, can improve the transmission rate of large capacity input.
For achieving the above object, the invention provides following technical scheme: a kind of wireless transmitter comprises: working frequency range covers dual-mode antenna and the receiving/transmission selection switch of 5725～5850MHZ frequency range at least, and described dual-mode antenna is connected with described receiving/transmission selection switch;
Receive 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 be used for the signal of digital signal processing module output 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 and described transmitter module, and the frequency synthesizer of local oscillation signal is provided 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 described quadrature frequency conversion frequency mixer carries out the quadrature frequency conversion mixing with the local oscillation signal that radiofrequency signal and the described frequency synthesizer of described 5725～5850MHZ frequency range provides, and is the analog baseband signal of 0～62.5MHZ from two output output frequency range;
The modulus that two-way is connected with two outputs of described quadrature frequency conversion frequency mixer is respectively processed branch road, described modulus is processed branch road the analog baseband signal of described 0～62.5MHZ is carried out filtering, and filtered described analog baseband signal is converted to digital signal exports to described digital signal processing module.
Preferably, described digital signal processing module is converted to digital baseband signal with the two ways of digital signals of input, and described two-way digital baseband signal is input to described transmitter module by two output respectively;
Described transmitter module comprises:
The two-way digital-to-analogue is processed branch road, and the input that described digital-to-analogue is processed 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 processing branch road respectively, and receiving described digital-to-analogue, to process the frequency range that branch road changes out be the quadrature up-conversion frequency mixer of 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 described quadrature up-conversion frequency mixer provides local oscillation signal to carry out the up-conversion mixing for analog baseband signal and the described frequency synthesizer of 0～62.5MHZ described two-way frequency range;
Input is connected with the output of described quadrature up-conversion frequency mixer, and aligns the radiofrequency signal output processing module that the radiofrequency signal after the mixing of handing in conversion mixer output is processed.
Preferably, described radiofrequency signal pretreatment module comprises:
Working frequency range covers 5725～5850MHZ frequency range at least, and the low noise amplifier that amplifies of the radiofrequency signal of 5725～5850MHZ frequency range that described dual-mode antenna is received, the input of described low noise amplifier is connected with an end of described receiving/transmission selection switch;
Input is connected with the output of described low noise amplifier, and centre frequency is that 5787.5MHZ, bandwidth are the first radio frequency band filter of 125MHZ.
Preferably, described modulus processing 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 the first low pass filter is connected with the input of the first variable gain amplifier;
The output of described 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 processing branch road comprises:
A digital to analog converter that output is connected of input and 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 the second variable gain amplifier, the output of described the 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 comprises:
Input is connected with the output of described quadrature up-conversion frequency mixer, and centre frequency is that 5787.5MHZ, bandwidth are the second radio frequency band filter of 125MHZ;
Input is connected with the output of described the second radio frequency band filter, and working frequency range covers the power amplifier of 5725～5850MHZ frequency range at least, and the output of described power amplifier is connected with described receiving/transmission selection switch.
Preferably, described R-T unit also comprises: the rf frequency synthesizer;
Described radio-frequency signal processing module comprises:
Working frequency range covers 5725～5850MHZ frequency range at least, and the low noise amplifier that amplifies of the radiofrequency signal of 5725～5850MHZ frequency range that described dual-mode antenna is received, the input of described low noise amplifier is connected with an end of described receiving/transmission selection switch;
Input is connected with the output of described low noise amplifier, and centre frequency is that 5787.5MHZ, bandwidth are the 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 the 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 comprises:
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 the second if bandpas filter;
The RF up-converter frequency mixer that first input end is connected with described the 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 is that 5787.5MHZ, bandwidth are the second radio frequency band filter of 125MHZ;
Input is connected with the output of described the second radio frequency band filter, and working frequency range covers the power amplifier of 5725～5850MHZ frequency range at least, 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.
via above-mentioned technical scheme as can be known, compared with prior art, the present invention openly 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 is processed and process, the radiofrequency signal that generates simultaneously can be propagated in 5725MHZ～5850MHZ frequency range by antenna, thereby carry out transfer of data in this frequency range, data transmission distance can be guaranteed and higher transmission rate can be realized, thereby realized under the prerequisite that guarantees transmission range, higher transmission rate can be arranged.
Description of drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or description of the Prior Art, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to the accompanying drawing that provides other accompanying drawing.
Fig. 1 shows the structural representation of an embodiment of a kind of wireless transmitter of the present invention;
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, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
The embodiment of the invention discloses a kind of wireless transmitter, this wireless transmitter comprises: working frequency range covers dual-mode antenna and the receiving/transmission selection switch of 5725MHZ～5850MHZ frequency range at least, and this dual-mode antenna is connected with described receiving/transmission selection switch; Receive 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 is used for the signal of digital signal processing module output 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; With the frequency synthesizer that the exit of this receiver module and transmitter module is connected, 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 is processed and process, the radiofrequency signal that generates simultaneously can be propagated in 5725MHZ～5850MHZ frequency range by antenna, and according to national regulation meet in 5725MHZ～5850MHZ frequency range the transfer of data index as can be known, when carrying out transfer of data in this frequency range, under the prerequisite that guarantees transmission range, higher transmission rate can be arranged.
, describe in detail to wireless transmitter of the present invention below in conjunction with accompanying drawing.
Referring to Fig. 1, show the structural representation of an embodiment of this a kind of wireless transmitter of the present invention, 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 covers the frequency range of 5725MHZ～5850MHZ at least.
This dual-mode antenna is connected with an 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 is used for realizing the work switching of receiver module and transmitter module, by setting the connecting and disconnecting of the circuit between this selector switch and receiver module and transmitter module, can control the receiver module received RF signal, perhaps control the outside emitting radio frequency signal of transmitter module.
The exit of this receiver module 3 all is 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 the radiofrequency signal in this 5725MHZ～5850MHZ frequency range is processed the generation analog baseband signal, and analog baseband signal is converted to is sent to digital signal processor after digital signal and processes.
Transmitter module is converted to the digital signal of digital signal processing module output and is adapted at the radiofrequency signal propagated in the 5725-5850MHZ frequency range.
Wireless transmitter of the present invention is based on the 5.8GHZ frequency range, adopt the frequency range of open 5725MHZ～5850MHZ to carry out reception, the transmission of radiofrequency signal, communication bandwidth 125MHZ, this R-T unit is at the Specifications of the band frequency that satisfies 5725MHZ～5850MHZ, transmission range can reach 1000m, transmission rate can reach 250mbps, has realized having improved transmission rate satisfying under the prerequisite of certain transmission range.
In the present invention, this receiver module 3 can comprise: radiofrequency signal pretreatment module 310, quadrature frequency conversion frequency mixer 320 and the two-way modulus processing branch road 330 that is connected to 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.This radiofrequency signal pretreatment module will output in the quadrature frequency conversion frequency mixer through the radiofrequency signal of pretreated this 5725MHZ～5850MHZ frequency range after the radiofrequency signal of the 5725MHZ that receives～5850MHZ frequency range is carried out preliminary treatment.
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 of these frequency synthesizer 5 outputs is input in this quadrature frequency conversion frequency mixer.The radiofrequency signal of the 5725～5850MHZ frequency range after this quadrature frequency conversion frequency mixer is processed the radiofrequency signal pretreatment module and the local oscillation signal that frequency synthesizer provides carry out the quadrature frequency conversion mixing, obtain the two-way frequency range and be 0～62.5MHZ(and be the analog baseband signal of DC～62.5MHZ), and the two-way analog baseband signal that obtains is outputed to this two-way modulus from two output respectively process branch road 330.
This two-way modulus is processed branch road 330 and is connected with two outputs of quadrature up-conversion frequency mixer respectively.Each road modulus is processed the analog baseband signal that branch road all aligns the 0～62.5MHZ that hands in conversion mixer output and is carried out the processing such as filtering, and the described analog baseband signal after filtering is processed is converted to digital signal and exports to digital signal processing module.
Accordingly, this digital signal processing module 6 is after the analog baseband signal that receives the input of two-way modulus processing branch road, this two-way analog baseband signal is processed be converted to digital baseband signal, and this two-way digital baseband signal is inputted in transmitter module by two output respectively.
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: the two-way digital-to-analogue is processed 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 processing branch road 410 is connected with two outputs of digital signal processing module respectively.This digital-to-analogue is processed branch road and is used for receiving the digital baseband signal of exporting from digital signal processing module, and digital baseband signal is converted to frequency range at the analog baseband signal of 0～62.5MHZ, and the analog baseband signal that is converted to is input in the quadrature up-conversion frequency mixer.Concrete, this digital-to-analogue is processed branch road this digital baseband signal is converted to analog baseband signal, and the operations such as amplification, filtering that this analog baseband signal is gained.
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 processing branch road respectively, and the frequency range that reception digital-to-analogue processing branch road is changed out is 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 by this local oscillation signal input, the local oscillation signal that frequency synthesizer produces is input in this quadrature up-conversion frequency mixer.This quadrature up-conversion frequency mixer is that the analog baseband signal of 0～62.5MHZ and the local oscillation signal of local oscillation signal input input carry out the up-conversion mixing with the frequency range of two baseband signal input inputs, produces the radiofrequency signal of 5725～5850MHZ frequency range and outputs to the 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 output 5725～5850MHZ frequency range of handing in conversion mixer output is processed.Can carry out power amplification to the radiofrequency signal of 5725～5850MHZ frequency range of this quadrature up-conversion frequency mixer output as this radiofrequency signal output processing module, 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 satisfy the condition that does not have DC maladjustment or reduce DC maladjustment, and in the present embodiment, this frequency synthesizer is the local oscillation signal of 5787.5MHZ for the local oscillation signal that receiver module and transmitter module provide in this kind situation.
This receiver module 3 comprises in the present embodiment: radiofrequency signal pretreatment module 310, quadrature up-conversion frequency mixer 320 and two-way modulus are processed branch road 330.
Concrete, this radio-frequency signal processing module 310 can comprise: working frequency range covers 5725～5850MHZ frequency range at least, and low noise amplifier 311 and centre frequency that the radiofrequency signal of 5725～5850MHZ frequency range that dual-mode antenna is received is amplified are that 5787.5MHZ, bandwidth are the first radio frequency band filter 312 of 125MHZ.
Wherein, the input of this low noise amplifier 311 is connected with an 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 of dual-mode antenna reception, and this radiofrequency signal is amplified, and reduce the noise of introducing, 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 in 5725～5850MHZ frequency range of this low noise amplifier 311 after amplifying, radiofrequency signal is input in this first radio frequency band filter 312.The centre frequency of this first radio frequency band filter 312 is that 5787.5MHZ, bandwidth are 125MHZ, therefore can carry out filtering to the radiofrequency signal of input and process, with the outer interference signal of filtering 5725～5850MHZ frequency range.
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.This quadrature frequency conversion frequency mixer 320 carries out the quadrature frequency conversion mixing with the local oscillation signal of the 5787.5MHZ that radiofrequency signal and this frequency synthesizer of radio-frequency (RF) signal input end input provides, produce the low-frequency analog baseband signal of two-way, the frequency range of the analog baseband signal of generation is that 0～62.5MHZ is DC～62.5MHZ.Wherein, after this quadrature frequency conversion frequency mixer receives frequency synthesizer and is input to local oscillation signal, this local oscillation signal is divided into two-way, one the tunnel through carrying out the down-conversion mixing with the radiofrequency signal of input after 90 degree phase shifts processing, another road local oscillation signal direct and radiofrequency signal carries out the down-conversion mixing, thereby produce homophase and quadrature two-way analog baseband signal, namely obtain I, Q two-way analog baseband signal.
I, the Q two-way analog baseband signal that this quadrature up-conversion frequency mixer produces is input to respectively the two-way modulus and processes in branch road 330.Every road modulus processing branch road 330 can comprise in the present embodiment: the first low pass filter 331, the 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, is used for receiving one road analog baseband signal of these quadrature frequency conversion frequency mixer 320 outputs.
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, and 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, is used for the analog baseband signal after mixing is filtered, with the filtering out of band signal.
The bandwidth of this first variable gain amplifier covers 0～62.5MHZ frequency range at least, is used for filtered analog baseband signal is amplified, to satisfy the requirement of analog to digital converter incoming level.This first variable gain amplifier can strong and weakly according to the signal that receives be regulated gain amplifier.
This analog to digital converter will be converted to digital signal through the analog baseband signal after filtering, amplification, carry out Digital Signal Processing in order to offer digital signal processing module.
Accordingly, in order to realize that utilizing 5725～5850MHZ frequency range to carry out radiofrequency signal sends propagation, this digital signal processing module is input to this receiver module with the digital baseband signal of its output.This digital signal processing module is exported the two-way digital baseband signal simultaneously in the present embodiment, i.e. I, Q two-way digital baseband signal, this two-way digital baseband signal are input to respectively the two-way digital-to-analogue of this receiver module and process in branch road.Concrete, this transmitter module 4 comprises: the two-way digital-to-analogue is processed branch road 410, quadrature up-conversion frequency mixer 420 and radiofrequency signal output processing module 430.In the present embodiment, every way mould processing branch road 410 includes: digital to analog converter 411, the 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 used for the digital baseband signal of digital signal processing module output is converted to analog baseband signal.
The bandwidth of operation of this second variable gain amplifier covers 0～62.5MHZ at least, and its analog baseband signal to input carries out power amplification, adjusts the gain amplifier of this analog baseband signal, to satisfy the requirement of transmitter module transmitting power.
The passband of this second low pass filter is 0～62.5MHZ, and its analog baseband signal that is used for after the amplification that will input carries out filtering, with the filtering out of band signal.
The two-way digital baseband signal of digital signal processing module output in the present embodiment is input in the quadrature up-conversion frequency mixer after processing through each element in digital-to-analogue processing branch road.
The 5787.5MHZ local oscillation signal that this quadrature up-conversion frequency mixer 420 will be inputted I, Q two-way analog baseband signal and frequency synthesizer 5 to be provided carries out the quadrature up-conversion mixing, 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 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 is used for aligning the 5725MHZ that the hands in conversion mixer output～radiofrequency signal of 5850MHZ frequency range and carries out filtering and process, with the outer interference signal of filtering 5725～5850MHZ frequency range.
The working frequency range of this power amplifier covers 5725～5850MHZ frequency range at least, is used for the radiofrequency signal of filtered this 5725～5850MHZ frequency range is carried out power amplification, to satisfy the needs of transmitting power.
Suppress problem in order to reduce mirror image, the present invention also provides a kind of wireless transmitter, shows the structural representation of a kind of another embodiment of wireless transmitter of the present invention referring to Fig. 2, and 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 the radio-frequency (RF) local oscillator signal for receiver module and transmitter module.
Accordingly, this frequency synthesizer 5 is to be the IF-FRE synthesizer in the present embodiment, for this receiver module and transmitter module provide the intermediate frequency local oscillator signal.Wherein, the frequency range of the intermediate frequency local oscillator signal that this frequency synthesizer provides can be set as required, but to guarantee that all the analog baseband signal frequency range that receiver module is changed out is 0～62.5MHZ, and need guarantee that the frequency range of the radiofrequency signal that transmitter module is changed out is 5725～5850MHZ.
Corresponding therewith, in the present embodiment, the radiofrequency signal pretreatment module 310 that connects in this receiver module 3 covers 5725～5850MHZ frequency range at least except comprising working frequency range, and the low noise amplifier 311 that amplifies of the radiofrequency signal of 5725～5850MHZ frequency range that dual-mode antenna is received, and centre frequency is that 5787.5MHZ, bandwidth are outside the first radio frequency band filter 312 of 125MHZ, also comprises: radio frequency down-conversion frequency mixer 313, the first intermediate frequency variable gain amplifier 314 and if bandpas filter 315.
Wherein, the function of this low noise amplifier 311 and the first radio frequency band filter with and annexation with embodiment illustrated in fig. 2 identical, the output of this first radio frequency band filter is connected with the first input end of radio frequency down-conversion frequency mixer 313 only 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 the radio-frequency (RF) local oscillator signal that first input end is input to through amplification, filtered radiofrequency signal and the input of this rf frequency synthesizer is carried out the down-conversion mixing, and the bandwidth that produces 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, and 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 the signal that its bandwidth for the intermediate frequency that the radio frequency down-conversion frequency mixer is exported is 125MHZ amplifies, to satisfy the requirement of analog to digital converter incoming level.
The pass band width of this if bandpas filter is 125MHZ, and the signal that is 125MHZ for the bandwidth with this intermediate frequency carries out filtering, with the filtering out of band signal.
In fact this quadrature frequency conversion frequency mixer 320 can be understood as with the intermediate frequency quadrature down-conversion mixer in the present embodiment, it is used for carrying out the quadrature frequency conversion mixing through the bandwidth of the intermediate frequency that obtains after filtering, amplification, intermediate frequency mixing for the intermediate frequency local oscillator signal that signal and this frequency synthesizer 5 of 125MHZ provides, and exports the analog baseband signal that I, Q two-way frequency range are 0～62.5MHZ.
Accordingly, be at transmitter module one end and difference embodiment illustrated in fig. 2:
After quadrature up-conversion frequency mixer in transmitter module carried out the quadrature up-conversion mixing with the analog baseband signal of I, Q two-way 0～62.5MHZ frequency range of input and intermediate frequency local oscillator signal that frequency synthesizer provides, the bandwidth of generation intermediate frequency was the signal of 125MHZ.
Further, radiofrequency signal output processing module 430 in this transmitter module is except comprising that centre frequency is that 5787.5MHZ, bandwidth are that the second radio frequency band filter 431 and the working frequency range of 125MHZ covers 5725～5850MHZ band power amplifier 432 at least, also comprises: the second if bandpas filter 433, the 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, is used for the signal after the mixing of quadrature up-conversion frequency mixer output is carried out filtering.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 its bandwidth of regulating the intermediate frequency of input according to the watt level that transmits is the gain amplifier of the signal of 125MHZ.
The second input of this RF up-converter frequency mixer is connected with this rf frequency synthesizer, this rf frequency synthesizer with the bandwidth of the intermediate frequency of first input end input for 125MHZ signal carry out the up-conversion mixing with the radio-frequency (RF) local oscillator signal that the rf frequency synthesizer provides, the radiofrequency signal of generation 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, and 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 and the difference of other embodiment that between each embodiment, identical similar part is mutually referring to getting final product.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be apparent concerning those skilled in the art, and General Principle as defined herein can be in the situation that do not break away from the spirit or scope of the present invention, realization in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a wireless transmitter, is characterized in that, comprising: working frequency range covers dual-mode antenna and the receiving/transmission selection switch of 5725～5850MHZ frequency range at least, and described dual-mode antenna is connected with described receiving/transmission selection switch;
Receive 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 be used for the signal of digital signal processing module output 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 and described transmitter module, and the frequency synthesizer of local oscillation signal is provided for described receiver module and transmitter module.
2. R-T unit according to claim 1, is characterized in that, 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 described quadrature frequency conversion frequency mixer carries out the quadrature frequency conversion mixing with the local oscillation signal that radiofrequency signal and the described frequency synthesizer of described 5725～5850MHZ frequency range provides, and is the analog baseband signal of 0～62.5MHZ from two output output frequency range;
The modulus that two-way is connected with two outputs of described quadrature frequency conversion frequency mixer is respectively processed branch road, described modulus is processed branch road the analog baseband signal of described 0～62.5MHZ is carried out filtering, and filtered described analog baseband signal is converted to digital signal exports to described digital signal processing module.
3. R-T unit according to claim 2, it is characterized in that, described digital signal processing module is converted to digital baseband signal with the two ways of digital signals of input, and described two-way digital baseband signal is input to described transmitter module by two output respectively;
Described transmitter module comprises:
The two-way digital-to-analogue is processed branch road, and the input that described digital-to-analogue is processed 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 processing branch road respectively, and receiving described digital-to-analogue, to process the frequency range that branch road changes out be the quadrature up-conversion frequency mixer of 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 described quadrature up-conversion frequency mixer provides local oscillation signal to carry out the up-conversion mixing for analog baseband signal and the described frequency synthesizer of 0～62.5MHZ described two-way frequency range;
Input is connected with the output of described quadrature up-conversion frequency mixer, and aligns the radiofrequency signal output processing module that the radiofrequency signal after the mixing of handing in conversion mixer output is processed.
4. according to claim 2 or 3 described R-T units, is characterized in that, described radiofrequency signal pretreatment module comprises:
Working frequency range covers 5725～5850MHZ frequency range at least, and the low noise amplifier that amplifies of the radiofrequency signal of 5725～5850MHZ frequency range that described dual-mode antenna is received, the input of described low noise amplifier is connected with an end of described receiving/transmission selection switch;
Input is connected with the output of described low noise amplifier, and centre frequency is that 5787.5MHZ, bandwidth are the first radio frequency band filter of 125MHZ.
5. according to claim 2 or 3 described methods, is characterized in that, described modulus is processed branch road and comprised:
The first low pass filter that input is connected with an output of described quadrature frequency conversion frequency mixer, and the output of described the first low pass filter is connected with the input of the first variable gain amplifier;
The output of described 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.
6. method according to claim 3, is characterized in that, described digital-to-analogue is processed branch road and comprised:
A digital to analog converter that output is connected of input and 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 the second variable gain amplifier, the output of described the second low pass filter is connected with a baseband signal input of described quadrature up-conversion frequency mixer.
7. method according to claim 3, is characterized in that, described radiofrequency signal output processing module comprises:
Input is connected with the output of described quadrature up-conversion frequency mixer, and centre frequency is that 5787.5MHZ, bandwidth are the second radio frequency band filter of 125MHZ;
Input is connected with the output of described the second radio frequency band filter, and working frequency range covers the power amplifier of 5725～5850MHZ frequency range at least, and the output of described power amplifier is connected with described receiving/transmission selection switch.
8. according to claim 2 or 3 described R-T units, is characterized in that, described R-T unit also comprises: the rf frequency synthesizer;
Described radio-frequency signal processing module comprises:
Working frequency range covers 5725～5850MHZ frequency range at least, and the low noise amplifier that amplifies of the radiofrequency signal of 5725～5850MHZ frequency range that described dual-mode antenna is received, the input of described low noise amplifier is connected with an end of described receiving/transmission selection switch;
Input is connected with the output of described low noise amplifier, and centre frequency is that 5787.5MHZ, bandwidth are the 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 the 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.
9. method according to claim 8, is characterized in that, described radiofrequency signal output processing module comprises:
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 the second if bandpas filter;
The RF up-converter frequency mixer that first input end is connected with described the 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 is that 5787.5MHZ, bandwidth are the second radio frequency band filter of 125MHZ;
Input is connected with the output of described the second radio frequency band filter, and working frequency range covers the power amplifier of 5725～5850MHZ frequency range at least, and the output of described power amplifier is connected with described receiving/transmission selection switch.
10. 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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