CN104954032A - Wireless receiver and application method thereof - Google Patents
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- CN104954032A CN104954032A CN201510268323.3A CN201510268323A CN104954032A CN 104954032 A CN104954032 A CN 104954032A CN 201510268323 A CN201510268323 A CN 201510268323A CN 104954032 A CN104954032 A CN 104954032A
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Abstract
The invention provides a wireless receiver and an application method thereof. The method includes the steps: an analog DC (direct current) eliminator searches for an analog DC quantization table stored in an analog DC quantization table module according to RF (radio frequency) gain of a wireless signal, to acquire analog DC quantized values of the wireless signal so as to eliminate analog DC of the wireless signal; an analog-digital converter converts the signal from the analog DC eliminator, a digital DC estimator estimates residual digital values of the signal converted by the analog-digital converter, and a digital DC compensator compensates residual DC of the converted signal with the estimated residual digital values of the converted signal; a DC feedback controller monitors high digital residual DC in real time and corrects analog DC quantized values of corresponding RF gain in real time, to eliminate the analog DC at an analog terminal as far as possible. By eliminating the analog DC, compensating the residual digital DC and utilizing a feedback control mechanism, the DC of the wireless signal is virtually eliminated, thus demodulation performance of the wireless receiver is enhanced, and receiving sensitivity of a wireless communication system is improved.
Description
Technical field
The present invention relates to wireless communication technology field, particularly a kind of wireless receiver and using method thereof.
Background technology
Wireless communication system comprises wireless transmitter and wireless receiver, and therefore the operating state of wireless transmitter and wireless receiver directly determines the performance of wireless communication system.Wireless receiver in usual OFDM wireless communication system is based on zero intermediate frequency (ZIF) framework, and this wireless receiver can produce the interference signal of interfere with wireless communications system in the course of the work, i.e. direct current (DC).DC is two aspects for the performance compromise main manifestations of wireless communication system: one is reduce ADC (analog to digital converter) effective number of bits, thus reduces the dynamic range of wireless communication system SNR (signal to noise ratio); Two is to eat dishes without rice or wine technology to this radio communication main flow of OFDM, and DC can the serious performance reducing baseband module FFT.
At present, when tackling DC and affecting the performance issue of wireless communication system, main employing scheme is that radio-frequency head eliminates radio frequency DC by the static DC meter generated during system initialization, adopts filter compensation residual DC at digital baseband simultaneously.But existing scheme has the following disadvantages:
1) static DC eliminates pattern, does not possess real-time characteristic, cannot cover the DC value inconsistency that chip and plate level components and parts difference cause;
2) static DC eliminates pattern, can cause larger residual DC, thus reduces the performance of digital baseband system;
3) digital baseband is without feedback mechanism, and digital baseband, when measuring larger residual DC, can only adopt compensation model part to improve baseband performance;
4) digital baseband DC firstorder filter adopts monosystem digital modeling, well can not weigh transient state and follow the tracks of the demand with stable state low ripple characteristic fast.
Thoroughly cannot eliminate for existing scheme the DC that wireless receiver produces, cause the problem of the hydraulic performance decline to wireless communication system, those skilled in the art are finding preferably solution always.
Summary of the invention
The object of the present invention is to provide a kind of wireless receiver and using method thereof, thoroughly cannot eliminate to solve existing scheme the DC that wireless receiver produces, cause performance in wireless communication systems still by the problem of DC interference.
For solving the problems of the technologies described above, the invention provides a kind of wireless receiver, described wireless receiver comprises:
Analog D C arrester, analog D C quantization table module, analog to digital converter, adaptive gain control unit, digital DC estimator and digital DC compensator, wherein,
Described adaptive gain control unit receives the signal that described analog to digital converter exports, and estimates the rf gain of radio frequency link;
Described analog D C arrester receives the signal of wireless signal and the output of described adaptive gain control unit, the analog D C quantization table stored in described analog D C quantization table module is searched according to the described rf gain that described adaptive gain control unit is estimated, obtain the analog D C quantized value of described wireless signal, to eliminate the analog D C in described wireless signal;
Analog to digital converter receives the signal of described analog D C arrester output and carries out analog-to-digital conversion to it, and the signal after analog-to-digital conversion is exported to digital estimator, digital DC compensator and adaptive gain control module respectively;
Described digital DC estimator receives the signal that described analog to digital converter exports, and digital DC value remaining in estimating the signal that described analog to digital converter exports;
Described digital DC compensator receives the signal of described analog to digital converter output and the signal of described digital DC estimator output, in the signal that the described analog to digital converter utilizing described digital DC estimator to estimate exports, remaining digital DC value complement repays the digital DC of the remnants in the signal of described analog to digital converter output, and exports the signal after compensating.
Optionally, in described wireless receiver, also comprise DC feedback controller, described DC feedback controller receives the signal of described adaptive gain control unit output and the signal of described digital DC estimator output, and output signal to described analog D C quantization table module, to revise the analog D C quantization table stored in described analog D C quantization table module.
Optionally, in described wireless receiver, the correcting module that described DC feedback controller comprises judge module and is connected with described judge module, wherein,
Described judge module receives the signal that described digital DC estimator exports, and judge whether the absolute value of the described digital DC value that the signal that described digital DC estimator exports carries is greater than predetermined threshold, if so, then runs described correcting module, otherwise, then described correcting module is not run;
Described correcting module receives the signal that described adaptive gain control unit exports, the rf gain of the signal exported according to described adaptive gain control unit determines to exist in the analog D C quantization table stored in described analog D C quantization table module the analog D C quantized value of error, and there is the analog D C quantized value of error according to the described digital DC value correction that the signal that described digital DC estimator exports carries.
Optionally, in described wireless receiver, described digital DC estimator is the low-pass first order filter with two feedback factor, described pair of feedback factor comprises the first feedback factor and the second feedback factor, described first feedback factor bandwidth is higher than described second feedback factor, using frame head verification sequence as the control signal switching feedback factor, when described frame head verification sequence is judged as mistake, adopt the first feedback factor, to follow the tracks of digital DC remaining in the signal of described analog to digital converter output fast; When described frame head verification sequence is judged as correct, adopt the second feedback factor, digital DC remaining in the signal exported with analog to digital converter described in steady track.
Optionally, in described wireless receiver, described analog D C arrester comprises the data call module, digital to analog converter, the analog signal biasing module that connect successively, described data call module receives the signal of wireless signal and the output of described analog D C quantization table module, and according to the rf gain of wireless signal and described analog D C quantization table, obtain the analog D C quantized value of wireless signal; Described analog D C quantized value is converted to analog D C by described digital to analog converter; Described analog D C eliminates by the mode that described analog signal biasing module is offset by analog signal.
Optionally, in described wireless receiver, the generative process of described analog D C quantization table is as follows:
At the initial phase of described wireless receiver, radio frequency link utilizes the analog D C quantized value corresponding to each rf gain between analog D C Measurement Algorithm measurement rf gain maximum and rf gain minimum value;
When all rf gains all measure, by the analog D C quantized value corresponding to each rf gain of measurement stored in analog quantization table.
Optionally, in described wireless receiver, described digital DC compensator is a subtracter.
Optionally, in described wireless receiver, also comprise low noise amplifier and frequency mixer, described wireless signal is successively transferred to described analog D C arrester after low noise amplifier, described frequency mixer process.
Optionally, in described wireless receiver, also comprise low pass filter and variable-gain amplifier, the signal that described analog D C arrester exports successively is transferred to described analog to digital converter after described low pass filter, described variable-gain amplifier process.
Optionally, in described wireless receiver, the signal that described adaptive gain control unit exports all is transferred to described low noise amplifier, described frequency mixer, described low pass filter and described variable-gain amplifier, carries out Automatic adjusument to amplify described low noise amplifier, described frequency mixer, described low pass filter and described variable-gain.
The present invention also provides a kind of using method of wireless receiver, comprises the steps:
Analog D C arrester receives wireless signal, and searches the analog D C quantization table stored in described analog D C quantization table module according to the rf gain of described wireless signal, obtains the analog D C quantized value of described wireless signal, to eliminate the analog D C in described wireless signal;
Analog to digital converter receives the signal of described analog D C arrester output and carries out analog-to-digital conversion to it, and the signal after analog-to-digital conversion is exported to digital estimator, digital DC compensator and adaptive gain control module respectively;
Described adaptive gain control unit receives the signal of described analog to digital converter output and carries out Automatic adjusument to it, and the signal after carrying out self-adaptative adjustment is exported to analog D C quantization table module;
Numeral DC estimator receives the signal that described analog to digital converter exports, and digital DC value remaining in estimating the signal that described analog to digital converter exports;
Digital DC compensator receives the signal of described analog to digital converter output and the signal of described digital DC estimator output, in the signal that the described analog to digital converter utilizing described digital DC estimator to estimate exports, remaining digital DC value complement repays the digital DC of the remnants in the signal of described analog to digital converter output, and exports the signal after compensating.
In wireless receiver provided by the present invention and using method thereof, the analog D C quantization table stored in analog D C quantization table module searched by analog D C arrester according to the rf gain of wireless signal, obtain the analog D C quantized value of wireless signal, eliminate the analog D C in wireless signal; Utilize analog to digital converter that the signal that analog D C arrester exports is carried out analog-to-digital conversion, in the signal that the analog to digital converter that digital DC compensator utilizes digital DC estimator to estimate afterwards exports, remaining digital DC value complement repays the elimination of digital DC by analog D C and the compensation of remaining digital DC of the remnants in the signal of analog to digital converter output, almost completely eliminate the DC in wireless signal, avoid the existence of DC to cause damage to performance in wireless communication systems, improve the receiving sensitivity performance of wireless communication system.On the other hand, due to the existence of DC feedback controller, the digital DC value realized the signal that digital DC estimator exports carries is monitored in real time, revise in real time with the analog D C quantization table stored analog D C quantization table module, improve the accuracy of analog D C quantization table, determine that analog D C quantized value, preferably the elimination analog D C of wireless signal lay the foundation accurately for follow-up.On the other hand, because digital DC estimator adopts the low-pass first order filter with two feedback factor, can the digital DC of remnants in the signal that exports of tracing compensation analog to digital converter real-time, thus improve the demodulation performance of wireless receiver.
Accompanying drawing explanation
Fig. 1 is the structural representation of wireless receiver in one embodiment of the invention;
Fig. 2 is the operation principle schematic diagram of analog D C quantization table module in one embodiment of the invention;
Fig. 3 is the operation principle schematic diagram of analog D C arrester in one embodiment of the invention;
Fig. 4 is digital DC estimator operation principle schematic diagram in one embodiment of the invention;
Fig. 5 is DC feedback controller operation principle schematic diagram in one embodiment of the invention.
In figure, analog D C quantization table module-10; Analog D C arrester-20; Data call module-21; Digital to analog converter-22; Analog signal biasing module-23; Numeral DC estimator-30; Digital DC compensator-40; DC feedback controller-50.
Embodiment
Below in conjunction with the drawings and specific embodiments, the wireless receiver that the present invention proposes is described in further detail.According to the following describes and claims, advantages and features of the invention will be clearer.It should be noted that, accompanying drawing all adopts the form that simplifies very much and all uses non-ratio accurately, only in order to object that is convenient, the aid illustration embodiment of the present invention lucidly.
Please refer to Fig. 1, it is the structural representation of wireless receiver in one embodiment of the invention, as shown in Figure 1, described wireless receiver comprises: analog D C arrester 20, analog D C quantization table module 10, analog to digital converter, adaptive gain control unit, digital DC estimator 30 and digital DC compensator 40, wherein
Described adaptive gain control unit receives the signal that described analog to digital converter exports, and estimates the rf gain of radio frequency link; Described analog D C arrester 20 receives the signal of wireless signal and the output of described adaptive gain control unit, the analog D C quantization table stored in described analog D C quantization table module 10 is searched according to the described rf gain that described adaptive gain control unit is estimated, obtain the analog D C quantized value of described wireless signal, to eliminate the analog D C in described wireless signal; Analog to digital converter receives the signal of described analog D C arrester 20 output and carries out analog-to-digital conversion to it, and the signal after analog-to-digital conversion is exported to digital estimator, digital DC compensator 40 and adaptive gain control module respectively; Described digital DC estimator 30 receives the signal that described analog to digital converter exports, and digital DC value remaining in estimating the signal that described analog to digital converter exports; Described digital DC compensator 40 receives the signal of described analog to digital converter output and the signal of described digital DC estimator 30 output, in the signal that the described analog to digital converter utilizing described digital DC estimator 30 to estimate exports, remaining digital DC value complement repays the digital DC of the remnants in the signal of described analog to digital converter output, and exports the signal after compensating.In the present embodiment, digital DC compensator 40 is preferably a subtracter.Here, analog D C quantization table is that wireless receiver generates and stores in analog D C quantization table module 10 in the starting stage in advance, describes the analog D C quantized value corresponding to each rf gain of radio frequency link work in described analog D C quantization table.Here, the process of the rf gain of adaptive gain control unit estimation radio frequency link is completed by software merit rating, because this content is the common practise of art technology, does not remake too much repeating at this.
Further, described wireless receiver also comprises DC feedback controller 50, described DC feedback controller 50 receives the signal of described adaptive gain control unit output and the signal of described digital DC estimator 30 output, and output signal to described analog D C quantization table module 10, to revise the analog D C quantization table stored in described analog D C quantization table module 10.
Preferably, wireless receiver also comprises low noise amplifier, frequency mixer, low pass filter and variable-gain amplifier, described wireless signal is successively transferred to described analog D C arrester 20 after low noise amplifier, described frequency mixer process, and the signal S1 that described analog D C arrester 20 exports successively is transferred to described analog to digital converter after described low pass filter, described variable-gain amplifier process.The signal that described adaptive gain control unit exports all is transferred to described low noise amplifier, described frequency mixer, described low pass filter and described variable-gain amplifier, carries out Automatic adjusument to amplify described low noise amplifier, described frequency mixer, described low pass filter and described variable-gain.Here be the common practise of those skilled in the art for the concrete structure of low noise amplifier, frequency mixer, low pass filter and variable-gain amplifier and respective operation principle thereof, just repeat no more at this.
In order to understand the wireless receiver operation principle of the application preferably, below in conjunction with Fig. 2 ~ Fig. 5, the operation principle of each device included by wireless receiver is set forth.
Please refer to Fig. 2, in the present embodiment, the generative process of described analog D C quantization table is as follows: at the initial phase of described wireless receiver, and radio frequency link utilizes the analog D C quantized value corresponding to each rf gain between analog D C Measurement Algorithm measurement rf gain maximum and rf gain minimum value; When all rf gains all measure, by the analog D C quantized value corresponding to each rf gain of measurement stored in analog quantization table.As shown in Figure 2, here the quantizing bit number of hypothetical simulation DC quantized value is N, assuming that the maximum of rf gain value Gain is Gain_max, minimum value is Gain_min, utilize the analog D C quantized value that each rf gain between analog D C Measurement Algorithm measurement Gain_min and Gain_max is corresponding, determine the process of the analog D C quantized value that each rf gain is corresponding, need all cycle criterions one time of N number of bit number of analog D C quantized value, utilize and the quantizing bit number of analog D C quantized value is embodied with the form of bit bit index, when analog D C measurement result is greater than zero, being equivalent to index is that the bit of i=N has data to exist, otherwise, index is that the bit of i does not have data, now can carry out index is the judgement whether bit of i-1 exists data, judge for N time just to terminate the measurement to analog D C quantized value under current radio frequency gain until complete.After between Gain_min and Gain_max, all rf gains all experience N cycle criterion, analog D C measures end, is quantized to refer to stored in analog D C quantization table by the analog D C measured corresponding to each rf gain, the generative process of end simulation DC quantization table.It should be noted that, what analog quantization table stored here is analog D C quantized value is store with digital DC form.
Preferably, please refer to Fig. 3, it is the operation principle schematic diagram of analog D C arrester 20 in one embodiment of the invention.As shown in Figure 3, described analog D C arrester 20 comprises the data call module 21, digital to analog converter 22, the analog signal biasing module 23 that connect successively, described data call module 21 receives the signal of wireless signal and the output of described analog D C quantization table module 10, and according to the rf gain of wireless signal and described analog D C quantization table, obtain the analog D C quantized value of wireless signal; Described analog D C quantized value is converted to analog D C by described digital to analog converter 22; Described analog signal biasing module 23 eliminates described analog D C by the mode that analog signal offsets.That is contained in wireless signal analog D C utilizes analog D C arrester 20 to eliminate, but consider that analog D C arrester 20 possibly thoroughly cannot remove all analog D C in wireless signal, in order to thoroughly remove the interference of DC for wireless communication system, the follow-up structure devising again the residual analog D C of removal, remove residual analog D C in order to comparatively accurate, the technical scheme of the application is that the form residual analog D C being converted to digital DC is removed.Further, the signal S1 exported by analog D C arrester 20 is converted to the form of digital signal through analog to digital converter, digital DC residual in utilize digital DC estimator 30 and digital DC compensator 40 cooperating to remove signal S2 that analog to digital converter exports (be equal to S1 the analog D C that remains), the signal that now digital DC compensator 40 exports is the signal after almost thoroughly eliminating DC, thus the existence of the DC avoiding wireless receiver to produce causes damage to performance in wireless communication systems, improve the receiving sensitivity performance of wireless communication system.
Please refer to Fig. 4, it is digital DC estimator 30 operation principle schematic diagram in one embodiment of the invention.As shown in Figure 4, described digital DC estimator 30 is for having the low-pass first order filter of two feedback factor, the difference comparing existing low-pass first order filter is, the low-pass first order filter with two feedback factor has two feedback factors, digital DC remaining in the signal S2 of tracking A/D converter output real-time can be realized, thus accurately estimate digital DC remaining in S2.Described couple of feedback factor α comprises the first feedback factor α 1 and the second feedback factor α 2, described first feedback factor α 1 bandwidth is higher than described second feedback factor α 2, using frame head verification sequence (HCS) as the control signal switching feedback factor (switching between α 1 and α 2), when described frame head verification sequence is judged as mistake, adopt the first feedback factor α 1, to follow the tracks of digital DC remaining in the signal S2 of described analog to digital converter output fast; When described frame head verification sequence is judged as correct, adopt the second feedback factor α 2, digital DC remaining in the signal S2 exported with analog to digital converter described in steady track.
Please refer to Fig. 1 and 5, Fig. 5 is DC feedback controller 50 operation principle schematic diagram in one embodiment of the invention.In order to realize the DC that removal wireless receiver produces preferably, the application devises the DC feedback controller 50 for revising analog D C quantization table.The core concept of design is: by the real-time monitoring to digital DC estimator 30, eliminate the effect of analog D C at analog D C arrester 20 place with assessment, thus evaluate the accuracy of the analog D C quantization table that analog D C quantization table module 10 generates, realize the correction of analog D C quantization table.
Concrete, the correcting module that described DC feedback controller 50 comprises judge module and is connected with described judge module, wherein, described judge module receives the signal that described digital DC estimator exports, and judge whether the absolute value of the described digital DC value that the signal S3 that described digital DC estimator 30 exports carries is greater than predetermined threshold, if so, then runs described correcting module, otherwise, then described correcting module is not run; Described correcting module receives the signal that described adaptive gain control unit exports, the rf gain of the signal exported according to described adaptive gain control unit determines to exist in the analog D C quantization table stored in described analog D C quantization table module the analog D C quantized value of error, and there is the analog D C quantized value of error according to the described digital DC value correction that the signal that described digital DC estimator exports carries.Wherein, described predetermined threshold is that those skilled in the art need the value of setting according to real work, does not do too much repeating at this to it.
Further, DC feedback controller 50 receives the signal S3 carried from digital DC estimator 30, digital DC result remaining in the S2 of digital DC estimator 30 estimation is carried in S3, if digital DC does not exceed predetermined threshold, show that analog D C arrester 20 is better for analog D C eradicating efficacy, without the need to revising current analog D C quantization table.If digital DC exceedes predetermined threshold, show analog D C arrester 20 for analog D C eliminate good not, remain too much analog D C, show that the analog D C quantization table of current use exists error (because elimination analog D C is the rf gain according to wireless signal, the analog D C quantized value obtaining the rf gain of corresponding wireless signal in described analog D C quantization table is eliminated), need the correcting module correction analog D C quantization table running digital DC estimator 30.Please continue to refer to Fig. 5, revise the process of analog D C quantization table, be actually and revise analog D C quantized value corresponding to current radio frequency gain, and the correction of analog D C quantized value is designed into the correction of analog D C direction and numerical value.
Accordingly, the application also provides a kind of using method of wireless receiver, specifically comprises the steps:
Analog D C arrester receives wireless signal, and searches the analog D C quantization table stored in described analog D C quantization table module according to the rf gain of described wireless signal, obtains the analog D C quantized value of described wireless signal, to eliminate the analog D C in described wireless signal;
Analog to digital converter receives the signal of described analog D C arrester output and carries out analog-to-digital conversion to it, and the signal after analog-to-digital conversion is exported to digital estimator, digital DC compensator and adaptive gain control module respectively;
Described adaptive gain control unit receives the signal of described analog to digital converter output and carries out Automatic adjusument to it, and the signal after carrying out self-adaptative adjustment is exported to analog D C quantization table module;
Numeral DC estimator receives the signal that described analog to digital converter exports, and digital DC value remaining in estimating the signal that described analog to digital converter exports;
Digital DC compensator receives the signal of described analog to digital converter output and the signal of described digital DC estimator output, in the signal that the described analog to digital converter utilizing described digital DC estimator to estimate exports, remaining digital DC value complement repays the digital DC of the remnants in the signal of described analog to digital converter output, and exports the signal after compensating.
To sum up, in wireless receiver provided by the present invention and using method thereof, the analog D C quantization table stored in analog D C quantization table module searched by analog D C arrester according to the rf gain of wireless signal, obtain the analog D C quantized value of wireless signal, eliminates the analog D C in wireless signal; Utilize analog to digital converter that the signal that analog D C arrester exports is carried out analog-to-digital conversion, in the signal that the analog to digital converter that digital DC compensator utilizes digital DC estimator to estimate afterwards exports, remaining digital DC value complement repays the elimination of digital DC by analog D C and the compensation of remaining digital DC of the remnants in the signal of analog to digital converter output, almost completely eliminate the DC in wireless signal, avoid the existence of DC to cause damage to performance in wireless communication systems, improve the receiving sensitivity performance of wireless communication system.On the other hand, due to the existence of DC feedback controller, the digital DC value realized the signal that digital DC estimator exports carries is monitored in real time, revise in real time with the analog D C quantization table stored analog D C quantization table module, improve the accuracy of analog D C quantization table, determine that analog D C quantized value, preferably the elimination analog D C of wireless signal lay the foundation accurately for follow-up.On the other hand, because digital DC estimator adopts the low-pass first order filter with two feedback factor, can the digital DC of remnants in the signal that exports of tracing compensation analog to digital converter real-time, thus improve the demodulation performance of wireless receiver.
Foregoing description is only the description to present pre-ferred embodiments, any restriction not to the scope of the invention, and any change that the those of ordinary skill in field of the present invention does according to above-mentioned disclosure, modification, all belong to the protection range of claims.
Claims (11)
1. a wireless receiver, is characterized in that, comprising: analog D C arrester, analog D C quantization table module, analog to digital converter, adaptive gain control unit, digital DC estimator and digital DC compensator, wherein,
Described adaptive gain control unit receives the signal that described analog to digital converter exports, and estimates the rf gain of radio frequency link;
Described analog D C arrester receives the signal of wireless signal and the output of described adaptive gain control unit, the analog D C quantization table stored in described analog D C quantization table module is searched according to the described rf gain that described adaptive gain control unit is estimated, obtain the analog D C quantized value of described wireless signal, to eliminate the analog D C in described wireless signal;
Analog to digital converter receives the signal of described analog D C arrester output and carries out analog-to-digital conversion to it, and the signal after analog-to-digital conversion is exported to digital estimator, digital DC compensator and adaptive gain control module respectively;
Described digital DC estimator receives the signal that described analog to digital converter exports, and digital DC value remaining in estimating the signal that described analog to digital converter exports;
Described digital DC compensator receives the signal of described analog to digital converter output and the signal of described digital DC estimator output, in the signal that the described analog to digital converter utilizing described digital DC estimator to estimate exports, remaining digital DC value complement repays the digital DC of the remnants in the signal of described analog to digital converter output, and exports the signal after compensating.
2. wireless receiver as claimed in claim 1, it is characterized in that, also comprise DC feedback controller, described DC feedback controller receives the signal of described adaptive gain control unit output and the signal of described digital DC estimator output, and output signal to described analog D C quantization table module, to revise the analog D C quantization table stored in described analog D C quantization table module.
3. wireless receiver as claimed in claim 2, is characterized in that, the correcting module that described DC feedback controller comprises judge module and is connected with described judge module, wherein,
Described judge module receives the signal that described digital DC estimator exports, and judge whether the absolute value of the described digital DC value that the signal that described digital DC estimator exports carries is greater than predetermined threshold, if so, then runs described correcting module, otherwise, then described correcting module is not run;
Described correcting module receives the signal that described adaptive gain control unit exports, the rf gain of the signal exported according to described adaptive gain control unit determines to exist in the analog D C quantization table stored in described analog D C quantization table module the analog D C quantized value of error, and there is the analog D C quantized value of error according to the described digital DC value correction that the signal that described digital DC estimator exports carries.
4. wireless receiver as claimed in claim 1, it is characterized in that, described digital DC estimator is the low-pass first order filter with two feedback factor, described pair of feedback factor comprises the first feedback factor and the second feedback factor, described first feedback factor bandwidth is higher than described second feedback factor, using frame head verification sequence as the control signal switching feedback factor, when described frame head verification sequence is judged as mistake, adopt the first feedback factor, to follow the tracks of digital DC remaining in the signal of described analog to digital converter output fast; When described frame head verification sequence is judged as correct, adopt the second feedback factor, digital DC remaining in the signal exported with analog to digital converter described in steady track.
5. wireless receiver as claimed in claim 1, it is characterized in that, described analog D C arrester comprises the data call module, digital to analog converter, the analog signal biasing module that connect successively, described data call module receives the signal of wireless signal and the output of described analog D C quantization table module, and according to the rf gain of wireless signal and described analog D C quantization table, obtain the analog D C quantized value of wireless signal; Described analog D C quantized value is converted to analog D C by described digital to analog converter; Described analog D C eliminates by the mode that described analog signal biasing module is offset by analog signal.
6. wireless receiver as claimed in claim 1, it is characterized in that, the generative process of described analog D C quantization table is as follows:
At the initial phase of described wireless receiver, radio frequency link utilizes the analog D C quantized value corresponding to each rf gain between analog D C Measurement Algorithm measurement rf gain maximum and rf gain minimum value;
When all rf gains all measure, by the analog D C quantized value corresponding to each rf gain of measurement stored in analog quantization table.
7. wireless receiver as claimed in claim 1, it is characterized in that, described digital DC compensator is a subtracter.
8. the wireless receiver according to any one of claim 1 to 7, is characterized in that, also comprises low noise amplifier and frequency mixer, and described wireless signal is successively transferred to described analog D C arrester after low noise amplifier, described frequency mixer process.
9. wireless receiver as claimed in claim 8, it is characterized in that, also comprise low pass filter and variable-gain amplifier, the signal that described analog D C arrester exports successively is transferred to described analog to digital converter after described low pass filter, described variable-gain amplifier process.
10. wireless receiver as claimed in claim 9, it is characterized in that, the signal that described adaptive gain control unit exports all is transferred to described low noise amplifier, described frequency mixer, described low pass filter and described variable-gain amplifier, carries out Automatic adjusument to amplify described low noise amplifier, described frequency mixer, described low pass filter and described variable-gain.
The using method of 11. 1 kinds of wireless receivers according to any one of claim 1 to 10, is characterized in that, comprises the steps:
Analog D C arrester receives wireless signal, and searches the analog D C quantization table stored in described analog D C quantization table module according to the rf gain of described wireless signal, obtains the analog D C quantized value of described wireless signal, to eliminate the analog D C in described wireless signal;
Analog to digital converter receives the signal of described analog D C arrester output and carries out analog-to-digital conversion to it, and the signal after analog-to-digital conversion is exported to digital estimator, digital DC compensator and adaptive gain control module respectively;
Described adaptive gain control unit receives the signal of described analog to digital converter output and carries out Automatic adjusument to it, and the signal after carrying out self-adaptative adjustment is exported to analog D C quantization table module;
Numeral DC estimator receives the signal that described analog to digital converter exports, and digital DC value remaining in estimating the signal that described analog to digital converter exports;
Digital DC compensator receives the signal of described analog to digital converter output and the signal of described digital DC estimator output, in the signal that the described analog to digital converter utilizing described digital DC estimator to estimate exports, remaining digital DC value complement repays the digital DC of the remnants in the signal of described analog to digital converter output, and exports the signal after compensating.
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