CN104242968A - Self-adaptive wireless receiver based on zigbee - Google Patents
Self-adaptive wireless receiver based on zigbee Download PDFInfo
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- CN104242968A CN104242968A CN201410428190.7A CN201410428190A CN104242968A CN 104242968 A CN104242968 A CN 104242968A CN 201410428190 A CN201410428190 A CN 201410428190A CN 104242968 A CN104242968 A CN 104242968A
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Abstract
The invention provides a self-adaptive wireless receiver based on zigbee. Various parameters of the receiver are set by detecting whether adjacent-channel interference exists or not and comprise the channel bandwidth of a filter, and the gain of a high-frequency pre-amplifier and the gain of a gain controllable amplifier are set through gain automatic control operation. The self-adaptive wireless receiver based on the zigbee has the advantages of being self-adaptive, efficient and low in power consumption.
Description
Technical field
The present invention relates to wireless communication field, particularly relate to a kind of adaptive radio receiver based on zigbee.
Background technology
Zigbee equipment needs the specification by zigbee, and it comprises sensitivity and adjacent-channel interference (ACI) test of receiver.In order to be tested by ACI, all high-order selective filters at ACI frequency external power can be significantly suppressed to be required.In addition, quantizer (ADC) must have enough dynamic ranges and resolution to represent the frequency band signals in passband and the ACI after selective filter.But to implement in circuit, high-order selective filter and the high resolution A/D C with a large amount of carry-out bit can consume more power and more expensive cost.
On the other hand, the selective filter of narrow frequency can suppress more ACI, but the selective filter in broadband can reach good sensitivity.Therefore, the frequency range of selective filter is often designed normally to be difficult to accept or reject.Traditional approach uses the minimum required exponent number selective filter of ACI specification to sacrifice some receiver sensitivities, and meet the quantity of minimum sample frequency and carry-out bit needed for an ADC, to save cost and power consumption.In addition, increasing radio area network (WLAN) equipment or bluetooth equipment also use identical frequency range (about 2.4 to 2.483GHz), and the coexisting of zigbee and WLAN, bluetooth equipment becomes a great challenge.
Summary of the invention
The object of the invention is to be achieved through the following technical solutions.
According to the embodiment of the present invention, propose a kind of adaptive radio receiver based on zigbee, described receiver comprises: zigbee antenna, high-frequency preamplifier, IF frequency converter, adaptively selected filter, gain controlled amplifier, selector switch, adaptive quantizer, Gain Automatic control unit, self adaptation zigbee receive main control unit, digital band-pass filter and self adaptation zigbee decoder.
According to the embodiment of the present invention, described zigbee antenna, it is for receiving high frequency radio signal;
Described high-frequency preamplifier, it has first input end, and described first input end is coupled to described zigbee antenna, the second input and output, in order to amplify described high frequency radio signal according to high-frequency preamplifier control signal;
Described IF frequency converter, it has input and output, and described input is coupled to the described output of described high-frequency preamplifier, in order to high frequency radio signal is directly converted to IF signal;
Described adaptively selected filter, it has first input end, the second input and output, described first input end is coupled to the described output of described IF frequency converter, in order to according to adjacent-channel interference index signal, optionally suppresses the interference outside described IF signal frequency range and noise;
Described gain controlled amplifier, it has first input end, the second input and output, in order to amplify the first signal according to gain controlled amplifier control signal, and exports secondary signal;
Described selector switch, it has first input end, second input, 3rd input and output, described first input end is coupled to the described output of described adaptively selected filter, described second input is coupled to the described output of described IF frequency converter, described output is coupled to the described first input end of described gain controlled amplifier, in order to connect according to selector switch control signal described IF frequency converter or described adaptively selected filter one of them to described gain controlled amplifier, when selector switch is connected to IF frequency converter, described first signal is the IF signal that IF frequency converter exports, when selector switch is connected to adaptively selected filter, described first signal is the signal that adaptively selected filter exports,
Described adaptive quantizer, it has first input end, the second input and output, described first input end is coupled to the described output of described gain controlled amplifier, in order to according to adjacent-channel interference index signal, optionally changing the secondary signal that described gain controlled amplifier exports is the 3rd digitized signal;
Described Gain Automatic control unit, it has first input end, second input, first output, second output and the 3rd output, described first input end is coupled to the described output of described adaptive quantizer, described first output is coupled to described second input of described high-frequency preamplifier, described second output is coupled to described second input of described gain controlled amplifier, for the signal power measured with follow the trail of the described three digital signal that described adaptive quantizer exports, determine the suitable gain setting of described high-frequency preamplifier and described gain controlled amplifier, set described high-frequency preamplifier control signal and described gain controlled amplifier control signal respectively, the signal power that described high-frequency preamplifier controlled signal to described high-frequency preamplifier and controlled signal to described gain controlled amplifier and measurement by described second output output gain controllable amplifier is exported by described first output,
Described self adaptation zigbee receives main control unit, it has input, first output, second output, described input is coupled to described 3rd output of Gain Automatic control unit, described first output is coupled to described second input of described adaptively selected filter, described second input of described adaptive quantizer and described second input of described Gain Automatic control unit, described second output is coupled to described 3rd input of described selector switch, in order to receive the signal power of described measurement, determine whether adjacent-channel interference exists and export described selector switch by described second output and control signal to described selector switch, described adjacent-channel interference index signal is exported to set described adaptively selected filter and described adaptive quantizer by described first output,
Described digital band-pass filter, it is coupled to the described output of described adaptive quantizer, in order to suppress the signal power outside the frequency range of described three digital signal and to export the 4th signal; And
Described self adaptation zigbee decoder, it is coupled to described digital band-pass filter, carries out the decoding of zigbee specification in order to the 4th signal exported described digital band-pass filter.
According to the embodiment of the present invention, described Gain Automatic control unit specifically comprises:
Displacement detector, for detecting the highest position of coming into force of supplied with digital signal, and according to the direction of displacement of the difference determination supplied with digital signal of this highest come into force position and reference value and figure place;
First shift register, is connected with the output of displacement detector, to supplied with digital signal displacement N position under the control of displacement detector;
FFT module, is connected with the first shift register, the digital signal after displacement is transformed from the time domain to frequency domain, obtains frequency domain digital signal;
Extremum extracting module, is connected with FFT module, detects the extreme value of the absolute value of frequency domain digital signal;
Corresponding look-up table block, is connected with extremum extracting module, and tabling look-up according to the extreme value of the absolute value of frequency domain digital signal obtains corresponding gain coefficient K;
Gain tuning output module, is connected with corresponding look-up table block with FFT module, exports the gain coefficient K of calculating to high-frequency preamplifier or/and gain controlled amplifier;
According to the embodiment of the present invention, described high-frequency preamplifier specifically comprises: the first power amplification circuit, the first low noise amplifier circuit, power supply and control circuit, an I/O coupler, and described power supply and control circuit provide power supply and control signal;
Described first power amplification circuit comprises the first input coupler, first adjustable decay device, the first order amplifier of the first power amplification circuit, first temperature-compensating decay device, the second level amplifier of the first power amplification circuit, the third level amplifier of the first power amplification circuit, the fourth stage amplifier of the first power amplification circuit, first directional coupler, first circulator, first radio-frequency (RF) switch of the first power amplification circuit, first coupler, second radio-frequency (RF) switch of the first power amplification circuit, first ohmic load, second ohmic load, first input coupler connects the input of the first adjustable decay device, the output of the first adjustable decay device connects the input of the first order amplifier of the first power amplification circuit, the output of the first order amplifier of the first power amplification circuit connects the first temperature-compensating decay device input, the output of the first temperature-compensating decay device connects the input of the second level amplifier of the first power amplification circuit, the output of the second level amplifier of the first power amplification circuit connects the input of the third level amplifier of the first power amplification circuit, the output of the third level amplifier of the first power amplification circuit connects the input of the fourth stage amplifier of the first power amplification circuit, the output of the fourth stage amplifier of the first power amplification circuit connects the input of the first directional coupler, first directional coupler exports two paths of signals, the first via output of the first directional coupler is connected with the first input end of the second radio-frequency (RF) switch of the first power amplification circuit by the coupled end of the first directional coupler, second road output of the first power amplification circuit directional coupler is connected with the first port of the first circulator, second port of the first circulator exports and is connected with the input of an I/O coupler, 3rd port of the first circulator is connected with the input of the first radio-frequency (RF) switch of the first power amplification circuit, first output of the first radio-frequency (RF) switch of the first power amplification circuit is connected with the input of the first coupler, the output of the first coupler is connected with the second input of the second radio-frequency (RF) switch of the first power amplification circuit, the isolation end of the first coupler is connected with the first ohmic load, and-90 degree coupled end of the first coupler are connected with the second ohmic load, second output of the first radio-frequency (RF) switch of the first power amplification circuit is connected with the input of the first order amplifier of the first low noise amplifier circuit, and the output of the second radio-frequency (RF) switch of the first power amplification circuit is connected with the second input of the 3rd radio-frequency (RF) switch of the first low noise amplifier circuit.
According to the embodiment of the present invention, the concrete execution step of the aforementioned adaptive radio receiver based on zigbee comprises:
Step 1: at time (T=T
0) time, open the power supply of this receiver, because the zigbee packetized signals for obtaining is at time (T=T
2) will do not transmitted, any at this time (T=T
2) before the signal power that detects be regarded as the adjacent-channel interference that sent by zigbee device.Adaptively selected filter controls selector switch by selector switch control signal, makes the output of IF frequency converter to be connected directly to gain controlled amplifier.
Step 2: at time T=T
0with T=T
1between, measure this broadband adjacent-channel interference by Gain Automatic control unit.
Step 3: after step 2 completes, according to adjacent-channel interference P
aCIpower detecting, this adjacent-channel interference P can be determined
aCIexistence whether.In step 2, if this adjacent-channel interference P
aCIbe greater than power threshold value P
tH, then setting adjacent-channel interference index signal is 1, otherwise it is then set as 0
Step 4: at time T=T
1time, link the input of adaptively selected filter to gain controlled amplifier, and can according to the adjacent-channel interference index signal in step 3 and then the passband frequency range setting adaptively selected filter; If adjacent-channel interference index signal is set to 1, then the passband frequency range of adaptively selected filter is set as narrow again and again wide, to constrain more adjacent channels interference; Otherwise, if adjacent-channel interference index signal is set to 0, that is exist without adjacent-channel interference, then the passband frequency range of adaptively selected filter be set as wideband frequency range, to improve the sensitivity of this receiver.
Step 5: at time T=T
2time, this is detected for the zigbee packetized signals obtained and encoded.
Relative to prior art, by the existence of detecting adjacent-channel interference whether adaptive radio receiver based on zigbee provided by the invention, the parameters of setting receiver, comprise the channel width of filter, and by Gain Automatic control algorithm, generate the gain setting of described high-frequency preamplifier and gain controlled amplifier, described receiver has self adaptation, advantage efficient and low in energy consumption.
Accompanying drawing explanation
By reading hereafter detailed description of the preferred embodiment, various other advantage and benefit will become cheer and bright for those of ordinary skill in the art.Accompanying drawing only for illustrating the object of preferred implementation, and does not think limitation of the present invention.And in whole accompanying drawing, represent identical parts by identical reference symbol.In the accompanying drawings:
Figure 1 show the adaptive radio receiver structural representation based on zigbee according to embodiment of the present invention;
Figure 2 illustrate the Gain Automatic control unit structural representation according to embodiment of the present invention.
Embodiment
Below with reference to accompanying drawings illustrative embodiments of the present disclosure is described in more detail.Although show illustrative embodiments of the present disclosure in accompanying drawing, however should be appreciated that can realize the disclosure in a variety of manners and not should limit by the execution mode of setting forth here.On the contrary, provide these execution modes to be in order to more thoroughly the disclosure can be understood, and complete for the scope of the present disclosure can be conveyed to those skilled in the art.
According to the embodiment of the present invention, propose a kind of adaptive radio receiver based on zigbee, as shown in Figure 1, described receiver comprises:
Zigbee antenna, it is for receiving high frequency radio signal;
High-frequency preamplifier, it has first input end, and described first input end is coupled to described zigbee antenna, the second input and output, in order to amplify described high frequency radio signal according to high-frequency preamplifier control signal;
IF frequency converter, it has input and output, and described input is coupled to the described output of described high-frequency preamplifier, in order to high frequency radio signal is directly converted to IF signal;
Adaptively selected filter, it has first input end, the second input and output, described first input end is coupled to the described output of described IF frequency converter, in order to according to adjacent-channel interference index signal, optionally suppresses the interference outside described IF signal frequency range and noise;
Gain controlled amplifier, it has first input end, the second input and output, in order to amplify the first signal according to gain controlled amplifier control signal, and exports secondary signal;
Selector switch, it has first input end, second input, 3rd input and output, described first input end is coupled to the described output of described adaptively selected filter, described second input is coupled to the described output of described IF frequency converter, described output is coupled to the described first input end of described gain controlled amplifier, in order to connect according to selector switch control signal described IF frequency converter or described adaptively selected filter one of them to described gain controlled amplifier, when selector switch is connected to IF frequency converter, described first signal is the IF signal that IF frequency converter exports, when selector switch is connected to adaptively selected filter, described first signal is the signal that adaptively selected filter exports,
Adaptive quantizer, it has first input end, the second input and output, described first input end is coupled to the described output of described gain controlled amplifier, in order to according to adjacent-channel interference index signal, optionally changing the secondary signal that described gain controlled amplifier exports is the 3rd digitized signal;
Gain Automatic control unit, it has first input end, second input, first output, second output and the 3rd output, described first input end is coupled to the described output of described adaptive quantizer, described first output is coupled to described second input of described high-frequency preamplifier, described second output is coupled to described second input of described gain controlled amplifier, for the signal power measured with follow the trail of the described three digital signal that described adaptive quantizer exports, determine the suitable gain setting of described high-frequency preamplifier and described gain controlled amplifier, set described high-frequency preamplifier control signal and described gain controlled amplifier control signal respectively, the signal power that described high-frequency preamplifier controlled signal to described high-frequency preamplifier and controlled signal to described gain controlled amplifier and measurement by described second output output gain controllable amplifier is exported by described first output,
Self adaptation zigbee receives main control unit, it has input, first output, second output, described input is coupled to described 3rd output of Gain Automatic control unit, described first output is coupled to described second input of described adaptively selected filter, described second input of described adaptive quantizer and described second input of described Gain Automatic control unit, described second output is coupled to described 3rd input of described selector switch, in order to receive the signal power of described measurement, determine whether adjacent-channel interference exists and export described selector switch by described second output and control signal to described selector switch, described adjacent-channel interference index signal is exported to set described adaptively selected filter and described adaptive quantizer by described first output,
Digital band-pass filter, it is coupled to the described output of described adaptive quantizer, in order to suppress the signal power outside the frequency range of described three digital signal and to export the 4th signal; And
Self adaptation zigbee decoder, it is coupled to described digital band-pass filter, carries out the decoding of zigbee specification in order to the 4th signal exported described digital band-pass filter.
According to the embodiment of the present invention, described Gain Automatic control unit specifically comprises, as shown in Figure 2:
Displacement detector, for detecting the highest position of coming into force of supplied with digital signal, and according to the direction of displacement of the difference determination supplied with digital signal of this highest come into force position and reference value and figure place;
First shift register, is connected with the output of displacement detector, to supplied with digital signal displacement N position under the control of displacement detector;
FFT module, is connected with the first shift register, the digital signal after displacement is transformed from the time domain to frequency domain, obtains frequency domain digital signal;
Extremum extracting module, is connected with FFT module, detects the extreme value of the absolute value of frequency domain digital signal;
Corresponding look-up table block, is connected with extremum extracting module, and tabling look-up according to the extreme value of the absolute value of frequency domain digital signal obtains corresponding gain coefficient K;
Gain tuning output module, is connected with corresponding look-up table block with FFT module, exports the gain coefficient K of calculating to high-frequency preamplifier or/and gain controlled amplifier;
According to the embodiment of the present invention, described high-frequency preamplifier specifically comprises: the first power amplification circuit, the first low noise amplifier circuit, power supply and control circuit, an I/O coupler, and power supply and control circuit provide power supply and control signal;
Described first power amplification circuit comprises the first input coupler, first adjustable decay device, the first order amplifier of the first power amplification circuit, first temperature-compensating decay device, the second level amplifier of the first power amplification circuit, the third level amplifier of the first power amplification circuit, the fourth stage amplifier of the first power amplification circuit, first directional coupler, first circulator, first radio-frequency (RF) switch of the first power amplification circuit, first coupler, second radio-frequency (RF) switch of the first power amplification circuit, first ohmic load, second ohmic load, first input coupler connects the input of the first adjustable decay device, the output of the first adjustable decay device connects the input of the first order amplifier of the first power amplification circuit, the output of the first order amplifier of the first power amplification circuit connects the first temperature-compensating decay device input, the output of the first temperature-compensating decay device connects the input of the second level amplifier of the first power amplification circuit, the output of the second level amplifier of the first power amplification circuit connects the input of the third level amplifier of the first power amplification circuit, the output of the third level amplifier of the first power amplification circuit connects the input of the fourth stage amplifier of the first power amplification circuit, the output of the fourth stage amplifier of the first power amplification circuit connects the input of the first directional coupler, first directional coupler exports two paths of signals, the first via output of the first directional coupler is connected with the first input end of the second radio-frequency (RF) switch of the first power amplification circuit by the coupled end of the first directional coupler, second road output of the first power amplification circuit directional coupler (7) is connected with the first port of the first circulator, second port of the first circulator exports and is connected with the input of an I/O coupler, 3rd port of the first circulator is connected with the input of the first radio-frequency (RF) switch of the first power amplification circuit, first output of the first radio-frequency (RF) switch of the first power amplification circuit is connected with the input of the first coupler, the output of the first coupler is connected with the second input of the second radio-frequency (RF) switch of the first power amplification circuit, the isolation end of the first coupler is connected with the first ohmic load, and-90 degree coupled end of the first coupler are connected with the second ohmic load, second output of the first radio-frequency (RF) switch of the first power amplification circuit is connected with the input of the first order amplifier of the first low noise amplifier circuit, and the output of the second radio-frequency (RF) switch of the first power amplification circuit is connected with the second input of the 3rd radio-frequency (RF) switch of the first low noise amplifier circuit.
According to the embodiment of the present invention, the concrete execution step of the described adaptive radio receiver based on zigbee is described below:
Should based on the power supply of the adaptive radio receiver of zigbee at time (T=T
0) time opens, it is at a distance of in initial time of reception (T=T
2) about N
1+ N
2second, this execution step and time shaft contain 5 steps:
Step 1: at time (T=T
0) time, open the power supply of this receiver, because the zigbee packetized signals for obtaining is at time (T=T
2) will do not transmitted, any at this time (T=T
2) before the signal power that detects be regarded as the adjacent-channel interference that sent by zigbee device.Adaptively selected filter controls selector switch by selector switch control signal, makes the output of IF frequency converter to be connected directly to gain controlled amplifier.
Step 2: at time T=T
0with T=T
1between, measure this broadband adjacent-channel interference by Gain Automatic control unit.
Step 3: after step 2 completes, according to adjacent-channel interference P
aCIpower detecting, this adjacent-channel interference P can be determined
aCIexistence whether.In step 2, if this adjacent-channel interference P
aCIbe greater than power threshold value P
tH, then setting adjacent-channel interference index signal is 1, otherwise it is then set as 0;
Step 4: at time T=T
1time, link the input of adaptively selected filter to gain controlled amplifier, and can according to the adjacent-channel interference index signal in step 3 and then the passband frequency range setting adaptively selected filter; If adjacent-channel interference index signal is set to 1, then the passband frequency range of adaptively selected filter is set as narrow again and again wide, to constrain more adjacent channels interference; Otherwise, if adjacent-channel interference index signal is set to 0, that is exist without adjacent-channel interference, then the passband frequency range of adaptively selected filter be set as wideband frequency range, to improve the sensitivity of this receiver.
Step 5: at time T=T
2time, this is detected for the zigbee packetized signals obtained and encoded.
The unit of the passband frequency range of adaptively selected filter mentioned is in the present invention (no matter B
narrowor B
wide) be all hertz (Hertz), adaptive quantizer sampling frequency (no matter R
highor R
low) unit be then samples/sec.
The above; be only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should described be as the criterion with the protection range of claim.
Claims (5)
1. based on an adaptive radio receiver of zigbee, described receiver comprises: zigbee antenna, high-frequency preamplifier, IF frequency converter, adaptively selected filter, gain controlled amplifier, selector switch, adaptive quantizer, Gain Automatic control unit, self adaptation zigbee receive main control unit, digital band-pass filter and self adaptation zigbee decoder.
2. as claimed in claim 1 based on an adaptive radio receiver of zigbee, described zigbee antenna, it is for receiving high frequency radio signal;
Described high-frequency preamplifier, it has first input end, and described first input end is coupled to described zigbee antenna, the second input and output, in order to amplify described high frequency radio signal according to high-frequency preamplifier control signal;
Described IF frequency converter, it has input and output, and described input is coupled to the described output of described high-frequency preamplifier, in order to high frequency radio signal is directly converted to IF signal;
Described adaptively selected filter, it has first input end, the second input and output, described first input end is coupled to the described output of described IF frequency converter, in order to according to adjacent-channel interference index signal, optionally suppresses the interference outside described IF signal frequency range and noise;
Described gain controlled amplifier, it has first input end, the second input and output, in order to amplify the first signal according to gain controlled amplifier control signal, and exports secondary signal;
Described selector switch, it has first input end, second input, 3rd input and output, described first input end is coupled to the described output of described adaptively selected filter, described second input is coupled to the described output of described IF frequency converter, described output is coupled to the described first input end of described gain controlled amplifier, in order to connect according to selector switch control signal described IF frequency converter or described adaptively selected filter one of them to described gain controlled amplifier, when selector switch is connected to IF frequency converter, described first signal is the IF signal that IF frequency converter exports, when selector switch is connected to adaptively selected filter, described first signal is the signal that adaptively selected filter exports,
Described adaptive quantizer, it has first input end, the second input and output, described first input end is coupled to the described output of described gain controlled amplifier, in order to according to adjacent-channel interference index signal, optionally changing the secondary signal that described gain controlled amplifier exports is the 3rd digitized signal;
Described Gain Automatic control unit, it has first input end, second input, first output, second output and the 3rd output, described first input end is coupled to the described output of described adaptive quantizer, described first output is coupled to described second input of described high-frequency preamplifier, described second output is coupled to described second input of described gain controlled amplifier, for the signal power measured with follow the trail of the described three digital signal that described adaptive quantizer exports, determine the suitable gain setting of described high-frequency preamplifier and described gain controlled amplifier, set described high-frequency preamplifier control signal and described gain controlled amplifier control signal respectively, the signal power that described high-frequency preamplifier controlled signal to described high-frequency preamplifier and controlled signal to described gain controlled amplifier and measurement by described second output output gain controllable amplifier is exported by described first output,
Described self adaptation zigbee receives main control unit, it has input, first output, second output, described input is coupled to described 3rd output of Gain Automatic control unit, described first output is coupled to described second input of described adaptively selected filter, described second input of described adaptive quantizer and described second input of described Gain Automatic control unit, described second output is coupled to described 3rd input of described selector switch, in order to receive the signal power of described measurement, determine whether adjacent-channel interference exists and export described selector switch by described second output and control signal to described selector switch, described adjacent-channel interference index signal is exported to set described adaptively selected filter and described adaptive quantizer by described first output,
Described digital band-pass filter, it is coupled to the described output of described adaptive quantizer, in order to suppress the signal power outside the frequency range of described three digital signal and to export the 4th signal; And
Described self adaptation zigbee decoder, it is coupled to described digital band-pass filter, carries out the decoding of zigbee specification in order to the 4th signal exported described digital band-pass filter.
3., as claimed in claim 2 based on an adaptive radio receiver of zigbee, described Gain Automatic control unit specifically comprises:
Displacement detector, for detecting the highest position of coming into force of supplied with digital signal, and according to the direction of displacement of the difference determination supplied with digital signal of this highest come into force position and reference value and figure place;
First shift register, is connected with the output of displacement detector, to supplied with digital signal displacement N position under the control of displacement detector;
FFT module, is connected with the first shift register, the digital signal after displacement is transformed from the time domain to frequency domain, obtains frequency domain digital signal;
Extremum extracting module, is connected with FFT module, detects the extreme value of the absolute value of frequency domain digital signal;
Corresponding look-up table block, is connected with extremum extracting module, and tabling look-up according to the extreme value of the absolute value of frequency domain digital signal obtains corresponding gain coefficient K;
Gain tuning output module, is connected with corresponding look-up table block with FFT module, exports the gain coefficient K of calculating to high-frequency preamplifier or/and gain controlled amplifier.
4. the adaptive radio receiver based on zigbee as claimed in claim 2, described high-frequency preamplifier specifically comprises: the first power amplification circuit, the first low noise amplifier circuit, power supply and control circuit, an I/O coupler, and described power supply and control circuit provide power supply and control signal;
Described first power amplification circuit comprises the first input coupler, first adjustable decay device, the first order amplifier of the first power amplification circuit, first temperature-compensating decay device, the second level amplifier of the first power amplification circuit, the third level amplifier of the first power amplification circuit, the fourth stage amplifier of the first power amplification circuit, first directional coupler, first circulator, first radio-frequency (RF) switch of the first power amplification circuit, first coupler, second radio-frequency (RF) switch of the first power amplification circuit, first ohmic load, second ohmic load, first input coupler connects the input of the first adjustable decay device, the output of the first adjustable decay device connects the input of the first order amplifier of the first power amplification circuit, the output of the first order amplifier of the first power amplification circuit connects the first temperature-compensating decay device input, the output of the first temperature-compensating decay device connects the input of the second level amplifier of the first power amplification circuit, the output of the second level amplifier of the first power amplification circuit connects the input of the third level amplifier of the first power amplification circuit, the output of the third level amplifier of the first power amplification circuit connects the input of the fourth stage amplifier of the first power amplification circuit, the output of the fourth stage amplifier of the first power amplification circuit connects the input of the first directional coupler, first directional coupler exports two paths of signals, the first via output of the first directional coupler is connected with the first input end of the second radio-frequency (RF) switch of the first power amplification circuit by the coupled end of the first directional coupler, second road output of the first power amplification circuit directional coupler is connected with the first port of the first circulator, second port of the first circulator exports and is connected with the input of an I/O coupler, 3rd port of the first circulator is connected with the input of the first radio-frequency (RF) switch of the first power amplification circuit, first output of the first radio-frequency (RF) switch of the first power amplification circuit is connected with the input of the first coupler, the output of the first coupler is connected with the second input of the second radio-frequency (RF) switch of the first power amplification circuit, the isolation end of the first coupler is connected with the first ohmic load, and-90 degree coupled end of the first coupler are connected with the second ohmic load, second output of the first radio-frequency (RF) switch of the first power amplification circuit is connected with the input of the first order amplifier of the first low noise amplifier circuit, and the output of the second radio-frequency (RF) switch of the first power amplification circuit is connected with the second input of the 3rd radio-frequency (RF) switch of the first low noise amplifier circuit.
5. the concrete execution step as the adaptive radio receiver based on zigbee of claim 1-4 as described in one of them comprises:
Step 1: at time (T=T
0) time, open the power supply of this receiver, because the zigbee packetized signals for obtaining is at time (T=T
2) will do not transmitted, any at this time (T=T
2) before the signal power that detects be regarded as the adjacent-channel interference that sent by zigbee device; Adaptively selected filter controls selector switch by selector switch control signal, makes the output of IF frequency converter to be connected directly to gain controlled amplifier;
Step 2: at time T=T
0with T=T
1between, measure this broadband adjacent-channel interference by Gain Automatic control unit;
Step 3: after step 2 completes, according to adjacent-channel interference P
aCIpower detecting, this adjacent-channel interference P can be determined
aCIexistence whether; In step 2, if this adjacent-channel interference P
aCIbe greater than power threshold value P
tH, then setting adjacent-channel interference index signal is 1, otherwise it is then set as 0;
Step 4: at time T=T
1time, link the input of adaptively selected filter to gain controlled amplifier, and can according to the adjacent-channel interference index signal in step 3 and then the passband frequency range setting adaptively selected filter; If adjacent-channel interference index signal is set to 1, then the passband frequency range of adaptively selected filter is set as narrow again and again wide, to constrain more adjacent channels interference; Otherwise, if adjacent-channel interference index signal is set to 0, that is exist without adjacent-channel interference, then the passband frequency range of adaptively selected filter be set as wideband frequency range, to improve the sensitivity of this receiver;
Step 5: at time T=T
2time, this is detected for the zigbee packetized signals obtained and encoded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410428190.7A CN104242968A (en) | 2014-08-25 | 2014-08-25 | Self-adaptive wireless receiver based on zigbee |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410428190.7A CN104242968A (en) | 2014-08-25 | 2014-08-25 | Self-adaptive wireless receiver based on zigbee |
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| CN114095328A (en) * | 2021-10-28 | 2022-02-25 | 成都中科微信息技术研究院有限公司 | UV frequency band 5G high-power terminal based on APD technology |
| CN114095328B (en) * | 2021-10-28 | 2024-04-26 | 成都中科微信息技术研究院有限公司 | UV frequency band 5G high-power terminal based on APD technology |
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| CN114095328B (en) * | 2021-10-28 | 2024-04-26 | 成都中科微信息技术研究院有限公司 | UV frequency band 5G high-power terminal based on APD technology |
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Application publication date: 20141224 |