CN1293492A - Radio MF receiver with integrated base-band digital MF AGC - Google Patents
Radio MF receiver with integrated base-band digital MF AGC Download PDFInfo
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- CN1293492A CN1293492A CN 99121929 CN99121929A CN1293492A CN 1293492 A CN1293492 A CN 1293492A CN 99121929 CN99121929 CN 99121929 CN 99121929 A CN99121929 A CN 99121929A CN 1293492 A CN1293492 A CN 1293492A
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Abstract
An MF radio receiver with integrated base-band digital MF AGC is aimed at increasing the processing capacity of digital MF system. Its MF demodulation unit is composed of MF demodulator, lower sampler, shaping filter, shift controller, signal power detector, AGC parameter generator and quantifying table. The analog MF AGC, digital MF shift processing AGC and digital base-band look-up control AGC are output from the AGC parameter generator to realize gain distribution.
Description
The present invention relates to a kind of wireless intermediate-frequency receiver, relate to a kind of wireless intermediate-frequency receiver that has integrated base-band digital intermediate frequency automatic gain control (AGC) or rather, particularly relate under digital intermediate frequency situation automatic gain and be controlled at planning in the whole wireless intermediate-frequency receiver system.
Accompanying drawing 1 illustrates the principle structure of wireless intermediate-frequency receiver, mainly comprise radio frequency amplification and down-converter unit, intermediate frequency demodulation unit and baseband signal processing unit, the radio frequency that is connected with reception antenna amplifies and down-converter unit output intermediate-freuqncy signal, intermediate frequency demodulation unit output baseband signal.Early stage wireless intermediate-frequency receiver all adopts analogy method to realize that along with digitlization, miniaturization and the intelligentized trend of communication industry, wireless intermediate-frequency receiver also develops into digital receiver from analog receiver.
The digital receiver of the first generation only partly adopts digital technology to handle at baseband signal processing unit, be called the analog intermediate frequency digital receiver, can satisfy the requirement that most of data-signal is handled, but the precision of base band and intermediate frequency analogue device such as baseband filter and volume all can't satisfy miniaturization, digitlization, intelligentized requirement.Present state-of-the-art technology is also to adopt digital technology to handle to the intermediate frequency demodulation part, is called digital if receiver.Because the speed height of intermediate-freuqncy signal, operand has greatly just become a great problem of Digital IF Processing, and particularly in range for wireless communication, signal fluctuation has on a large scale brought bigger treating capacity to Signal Processing.And operand is to be separated by digital intermediate frequency to be in harmonious proportion how much the deciding of multiplying amount of digital filter, and its multiplying amount is mainly reflected on the figure place of multiplication number of times and multiplier factor.Prior art is the speed that sampling techniques reduces signal under adopting behind the if sampling again to the way that reduces operand, promptly reduces the number of times of multiplication, is beneficial to the further processing of follow-up signal.Therefore the digital technology of prior art intermediate frequency demodulation part is handled and is mainly comprised if sampling (A/D conversion) and following sampling techniques.
Shown in the accompanying drawing 2, be to amplify and the down-converter unit part at radio frequency, promptly in the amplifier 21 that is linked in sequence, frequency mixer 22, band pass filter 23 and 24 dynamic ranges of controlling intermediate frequency AGC by employing radio frequency power detector 25 of simulation variable gain amplifier, signal excursion when promptly reducing the A/D sampling by simulation AGC is accurately controlled signal.In this technical scheme, require the analogue signal amplitude of simulation variable gain amplifier 24 outputs can not surpass the scope of A/D conversion incoming level, otherwise will cause the blasting of quantification; Also require the analog signal of simulation variable gain amplifier 24 outputs could guarantee the precision of subsequent treatment as much as possible near the maximum input level of A/D conversion.Therefore, adopt the digital if receiver of simulation AGC no doubt to solve many shortcomings of analog intermediate frequency receiver, but thoroughly do not solve contradiction wherein, comprising: control step-length, the precision of simulation AGC are not accurate enough, realize difficulty of accurate control ratio; AGC is not high at bigger dynamic range internal linear degree in simulation, this be because simulation AGC the matching performance of broadband signal to be difficult to guarantee and simulate performances such as the amplitude of AGC in the broadband, phase place, group delay all poor.
Accompanying drawing 3 illustrates the another kind of common automatic gain controlling schemes of digital if receiver, be at the intermediate frequency demodulation cell mesh, promptly the simulation variable gain amplifier 31 that is linked in sequence, A/D converter 32, if demodulator 33 and down 34 of samplers be the amplification quantity of behind base band demodulating, controlling AGC by adopting intermediate frequency power detector 35 to control the amplification quantity of simulation variable gain amplifier 31 (AGC) according to the power of digital baseband signal.Be to adopt the A/D converter of great dynamic range to satisfy the demand of dynamic range of signals in this solution, the angle that keeps big surplus from the A/D conversion goes out to send the degree of dependence and the further processing that be beneficial to digital signal of reduction to device, popular A/D converter generally is 8～16 bits at present, can realize than analogue system more accurately, flexibly control, but still the speed of factor word intermediate frequency is higher, and the increase of number of bits purpose causes the quick increase for the treatment of capacity.
The objective of the invention is to design a kind of wireless intermediate-frequency receiver that has the control of integrated base-band digital intermediate frequency automatic gain, with simple, practicality is the invention aim, reduce the operand (or claiming treating capacity) of digital intermediate frequency system significantly, promptly reduce the complexity of its realization, reduction reaches accurate control simultaneously to the dependence of device.
The object of the present invention is achieved like this: a kind of wireless intermediate-frequency receiver that has the control of integrated base-band digital intermediate frequency automatic gain comprises intermediate frequency demodulation unit and baseband signal processing unit; Described intermediate frequency demodulation unit receives analog if signal, the output digital baseband signal, comprise the simulation variable gain amplifier, A/D converter, if demodulator, following sampler and the formed filter that are linked in sequence, it is characterized in that: also include shift controller, signal power detector, automatic gaining controling parameter maker and quantization table; Described shift controller be connected after the described A/D converter with if demodulator before, described signal power detector and automatic gaining controling parameter maker are linked in sequence; Described automatic gaining controling parameter maker is used to guarantee that to described simulation variable gain amplifier output analog intermediate frequency AGC signal A/D converter input signal is in preferable quantizing range; Described automatic gaining controling parameter maker is to described shift controller output digital intermediate frequency shifting processing AGC signal, is used to realize the coarse adjustment that gains; Described automatic gaining controling parameter maker is tabled look-up to described quantization table output digital baseband and is controlled the AGC signal, according to the Distribution Statistics generation and the modification quantization table of received signal in the certain hour; Described simulation variable gain amplifier receives described analog if signal, described signal power detector is to measure the energy of power collecting signal of the digital baseband of formed filter output, exports behind the power collecting signal inquiry quantization table of the digital baseband signal of described intermediate frequency demodulation unit output by the digital baseband of formed filter output.
Also include DC filter, be arranged on down between sampler and formed filter; Also be provided with filter between described signal power detector and described automatic gaining controling parameter maker.
Described DC filter is the digital filter of isolated DC.
Described analog intermediate frequency AGC signal is the amplification quantity of the described simulation variable gain amplifier of control.
Described shift controller is the shift operation device, and described digital intermediate frequency shifting processing AGC signal is to carry out computing by the effective bit that the control shifting processing is got wherein.
Described distribution according to received signal generates and revises quantization table is to add up to received signal, calculates the distribution mean square deviation of received signal.
Described A/D converter is the A/D converter of N bit great dynamic range, the input of described if demodulator is minimum to need M significant bit data, and the m bit that described shift controller is got wherein carries out shift operation, then N＞M, M＜m＜N, and m is near M.
Common digital if receiver reduces operand with following sampling techniques, the starting point of its solution is to reduce the number of times of multiplication, and a kind of wireless intermediate-frequency receiver that has the control of integrated base-band digital intermediate frequency automatic gain of the present invention, be on the basis that utilizes the conventional solution advantage, in conjunction with automatic gain control (AGC) technology, by the signal amplitude size before the adjustment A/D conversion, the signal quality after the assurance A/D conversion; Reduce the figure place of deal with data by shifting algorithm, thereby reduced the operand (reducing the figure place of multiplier factor) of digital signal; Distribute to received signal simultaneously and carries out statistical disposition, the generating quantification table decides digital baseband to quantize output again by tabling look-up, and has overcome the shortcoming that conventional art is not considered signal distributions situation unified quantization, has improved the quality of system.The wireless intermediate-frequency receiver that has the control of integrated base-band digital intermediate frequency automatic gain of the present invention, except all advantages with digital if receiver, the most direct effect is the amount of calculation that has significantly reduced the digital intermediate frequency system.
A kind of wireless intermediate-frequency receiver that has the control of integrated base-band digital intermediate frequency automatic gain of the present invention, improve digital intermediate frequency system design complexity, calculation process amount and to the coordinating and unifying of each side such as device degree of dependence by distributing automatic gain to be controlled at the position of the whole intermediate frequency demodulation of wireless intermediate-frequency receiver part rightly and utilize the characteristics of each several part rightly, reaching.The present invention is by realizing the rough adjustment of simulation AGC to the reasonable distribution of AGC, make circuit structure the simplest, to the dependence minimum of device; The simplest method that digital intermediate frequency adopts digital AGC to demarcate (Scaling) reduces the bit number (figure place of multiplier factor) of operational data rapidly, reduce the treating capacity of digital intermediate frequency system, when the Data Base band signal is exported, carry out the accurate control of AGC at last.
Below in conjunction with embodiment and the further technology of the present invention of accompanying drawing.
Fig. 1 is common wireless intermediate-frequency receiver principle structure block diagram
Fig. 2 is the principle structure block diagram of analog intermediate frequency digital receiver automatic gain controlling schemes
Fig. 3 is the principle structure block diagram that adopts the digital if receiver automatic gain controlling schemes of base band control
Fig. 4 is the structured flowchart that the present invention has the wireless receiver of integrated base-band digital intermediate frequency automatic gain control
Fig. 5 is the control flow schematic diagram that wireless intermediate-frequency receiver shown in Figure 4 is finished the AGC Comprehensive Control
Addressed before the explanation of Fig. 1 to Fig. 3 and repeated no more.
Referring to Fig. 4, have the structure of the wireless receiver of integrated base-band digital intermediate frequency automatic gain control shown in the figure, form by antenna element 41, radio frequency amplification and down-converter unit 42, intermediate frequency demodulation unit 43 and baseband signal processing unit 44.Radio frequency amplifies and down-converter unit 42 output analog if signals, intermediate frequency demodulation unit 43 output digital baseband signals.Then form the wireless intermediate-frequency receiver that has the control of integrated base-band digital intermediate frequency automatic gain of the present invention by intermediate frequency demodulation unit 43 and baseband signal processing unit 44.
Intermediate frequency demodulation unit 43 includes simulation variable gain amplifier 4301, A/D converter 4302, shift controller 4303, if demodulator 4304, following sampler 4305, DC filter 4306, formed filter 4307, signal power detector 4308, filter 4309, automatic gaining controling parameter maker 4310 and quantization table 4311.Analog if signal inputs to simulation variable gain amplifier 4301, by quantization table 4311 output digital baseband signals.
If demodulator 4304 in the intermediate frequency demodulation unit 43, following sampler 4305 and formed filter 4307 are necessary links of Digital IF Processing, and be identical with traditional processing method.
The present invention is divided into three parts with automatic gain control, be that signal power detection, filtering and automatic gain parameter generate, and carry out Comprehensive Control, thereby finish power measurement and form the gain allocation that automatic gain is controlled the each several part of three parts with the power collecting signal of digital baseband signal.
4310 pairs of automatic gaining controling parameter makers simulation variable gain amplifier 4301, shift controller 4303 and quantization table 4,311 three parts generate automatic gaining controling parameter respectively, comprise analog intermediate frequency AGC signal, digital intermediate frequency shifting processing AGC signal and the digital baseband control AGC signal of tabling look-up.
Analog intermediate frequency AGC signal wherein is the amplification quantity of control simulation variable gain amplifier 4301, thereby can enlarge the dynamic range of wireless intermediate-frequency receiver received signal, make the input signal of A/D converter 4302 be in the preferred range of quantification, can reduce dependence, with the needs that satisfy intermediate frequency demodulation and reduce requirement to intermediate frequency demodulation AGC to the A/D converter.During enforcement,, look after the needs of dynamic range simultaneously, can adopt the A/D converter of N bit, at this moment N＞M as long as suppose after the A/D conversion the just correctly demodulation of M valid data bit is arranged.
Digital intermediate frequency shifting processing AGC signal is used for the shift operation of shift controller 4303 is controlled, to realize the coarse adjustment of gain, as the coarse adjustment of 6dB.Because what A/D converter 4302 of the present invention adopted is the A/D conversion of great dynamic range, if intermediate frequency demodulation is directly made in the output of A/D converter 4302, its treating capacity will be very considerable, the present invention is by increasing shift controller 4303 at A/ D converter 4302 and 4304 of if demodulators, and by the control shifting processing, the effective bit of getting wherein carries out computing, and makes the operand of controlling simply and can obviously reducing the follow-up data processing.During enforcement, as the m bit of getting wherein carries out computing, and then M＜m＜N, and m is as far as possible near M.
Digital baseband is tabled look-up and is controlled the AGC signal, be to add up by distributing to received signal by automatic gaining controling parameter maker 4310, calculate the mean square deviation (SIGMA) that received signal distributes, to guarantee most of received signal, as 99.9%, be in the scope that quantizes once more, and according to received signal distribution generating quantification table 4311.In wireless technical field, wireless signal is generally described with the Gaussian channel model, the n one-bit data signal of AGC output obey N (0, in the time of SIGMA), SIGMA
2Be the average energy of received signal.The probability of received signal in n bit satisfies certain formula, so the selection of SIGMA value directly determines the formation of quantization table, thus the decision quantization resolution.In the experiment multi-user system, channel is a fading channel, and the influence of the shape factor of multi-user's channel disturbance and transmitting terminal is arranged, and the optimum value of SIGMA should be come emulation and checking by Monte-carllo simulation.As awgn channel, when adopting 4 bit quantizations, the value of SIGMA is 2.9; As the Rayleigh fading channel, Doppler frequency 120Hz, the value of SIGMA is 2.6.
The digital baseband signal of final output is to table look-up definite by the power collecting signal of digital baseband to quantization table 4311.
Referring to Fig. 5, flow process illustrates the automatic gain control to the wireless intermediate-frequency receiver of digital intermediate frequency, the i.e. operating process of automatic gaining controling parameter maker 4310 among the figure.Step 51 according to the baseband signal energy that signal power detector 4308 is detected, is determined the level of received signal by automatic gaining controling parameter maker 4310; Step 52,4301 outputs of judgement simulation variable gain amplifier are whether the input of A/D converter 4302 is in optimum state (preferable quantizing range state is by the quality requirement and the decision of the quantification signal to noise ratio after the A/D conversion of received signal); If the input of A/D converter 4302 is not in optimum state, then execution in step 53, and control analog intermediate frequency AGC signal adds or deduct a step-length; If the input of A/D converter 4302 has been in optimum state, then execution in step 54, generate digital intermediate frequency shifting processing AGC signal, determine the figure place of shift controller 4303 displacements; Step 55, according to the distribution situation of nearest t received signal in the time, the generation digital baseband is tabled look-up and is controlled the AGC signal, generates and also revises quantization table 4311.
The wireless intermediate-frequency receiver that has the control of integrated base-band digital intermediate frequency automatic gain of the present invention, by carrying out the Combined Treatment of analog intermediate frequency, digital intermediate frequency and digital baseband AGC signal to received signal, significantly reduce the operand of high-speed digital signal, reached processing speed and the unification of handling quality.
If A/D converter 4302 adopts 12 bit quantizations, if 12 bits are directly carried out multiplying, 12 bits multiply by 12 bits, need the shift unit of 24 bits to make adder 11 the addition computings of do of 11 shift operations, 24 bits and the register of 24 bits.And, then adopt 6 bits to multiply by 6 bit multiplication of 6 bits if A/D converter 4302 adopts 6 bit quantizations, need the shift unit of 12 bits to make adder 5 the addition computings of do of 5 shift operations, 12 bits and the register of 12 bits.So, adopt 12 bit multipliers will take much more hardware resource with respect to 6 bit multipliers.
Therefore be the figure place of multiplier factor by reducing the multiplication figure place, the complexity straight line of multiplier and adder is descended, the number of times of computing also greatly reduces.
Claims (7)
1. a wireless intermediate-frequency receiver that has the control of integrated base-band digital intermediate frequency automatic gain comprises intermediate frequency demodulation unit and baseband signal processing unit; Described intermediate frequency demodulation unit receives analog if signal, the output digital baseband signal, comprise the simulation variable gain amplifier, A/D converter, if demodulator, following sampler and the formed filter that are linked in sequence, it is characterized in that: also include shift controller, signal power detector, automatic gaining controling parameter maker and quantization table; Described shift controller be connected after the described A/D converter with if demodulator before, described signal power detector and automatic gaining controling parameter maker are linked in sequence; Described automatic gaining controling parameter maker is used to guarantee that to described simulation variable gain amplifier output analog intermediate frequency AGC signal A/D converter input signal is in preferable quantizing range; Described automatic gaining controling parameter maker is to described shift controller output digital intermediate frequency shifting processing AGC signal, is used to realize the coarse adjustment that gains; Described automatic gaining controling parameter maker is tabled look-up to described quantization table output digital baseband and is controlled the AGC signal, according to the Distribution Statistics generation and the modification quantization table of received signal in the certain hour; Described simulation variable gain amplifier receives described analog if signal, described signal power detector is to measure the energy of power collecting signal of the digital baseband of formed filter output, exports behind the power collecting signal inquiry quantization table of the digital baseband signal of described intermediate frequency demodulation unit output by the digital baseband of formed filter output.
2. the wireless intermediate-frequency receiver that has the control of integrated base-band digital intermediate frequency automatic gain according to claim 1 is characterized in that: also include DC filter, be arranged on down between sampler and formed filter; Also be provided with filter between described signal power detector and described automatic gaining controling parameter maker.
3. the wireless intermediate-frequency receiver that has the control of integrated base-band digital intermediate frequency automatic gain according to claim 2, it is characterized in that: described DC filter is the digital filter of isolated DC.
4. according to claim 1 or the 2 or 3 described wireless intermediate-frequency receivers that have the control of integrated base-band digital intermediate frequency automatic gain, it is characterized in that: described analog intermediate frequency AGC signal is the amplification quantity of the described simulation variable gain amplifier of control.
5. according to claim 1 or the 2 or 3 described wireless intermediate-frequency receivers that have the control of integrated base-band digital intermediate frequency automatic gain, it is characterized in that: described shift controller is the shift operation device, and described digital intermediate frequency shifting processing AGC signal is to carry out computing by the effective bit that the control shifting processing is got wherein.
6. the wireless intermediate-frequency receiver that has the control of integrated base-band digital intermediate frequency automatic gain according to claim 1 and 2, it is characterized in that: described distribution according to received signal generates and revises quantization table is to add up to received signal, calculates the distribution mean square deviation of received signal.
7. according to claim 1 or the 2 or 3 described wireless intermediate-frequency receivers that have the control of integrated base-band digital intermediate frequency automatic gain, it is characterized in that: described A/D converter is the A/D converter of N bit great dynamic range, the input of described if demodulator is minimum to need M significant bit data, the m bit that described shift controller is got wherein carries out shift operation, N＞M then, M＜m＜N, and m is near M.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99121929 CN1124696C (en) | 1999-10-15 | 1999-10-15 | Radio MF receiver with integrated base-band digital MF AGC |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 99121929 CN1124696C (en) | 1999-10-15 | 1999-10-15 | Radio MF receiver with integrated base-band digital MF AGC |
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| CN1293492A true CN1293492A (en) | 2001-05-02 |
| CN1124696C CN1124696C (en) | 2003-10-15 |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100352171C (en) * | 2003-11-22 | 2007-11-28 | Lg电子株式会社 | Apparatus and method for enhancing a reception rate of a receiver with AGC |
| WO2008077274A1 (en) * | 2006-12-25 | 2008-07-03 | Thomson Licensing | Method and device for automatic gain control |
| CN101515807B (en) * | 2008-02-21 | 2012-07-04 | 卓胜微电子（上海）有限公司 | Digital intermediate-frequency receiver |
| CN1843010B (en) * | 2003-08-28 | 2012-07-11 | 艾利森电话股份有限公司 | Method and system for adaptable receiver parameters |
| CN102655675A (en) * | 2011-03-04 | 2012-09-05 | 联咏科技股份有限公司 | Automatic gain control device and automatic gain control method |
| CN108471296A (en) * | 2018-03-07 | 2018-08-31 | 中国电子科技集团公司第三十研究所 | A kind of high-precision speed automatic gain control system suitable for short-term burst transmission |
| CN108599781A (en) * | 2018-04-10 | 2018-09-28 | 中国科学院国家空间科学中心 | Detect examination intermediate-frequency receiver to a kind of fpga chip, intermediate frequency demodulation card and satellite data transmission |
| CN109120292A (en) * | 2018-08-06 | 2019-01-01 | 电子科技大学 | A kind of digital automatic gain control system and method |
| US10922276B2 (en) | 2014-11-10 | 2021-02-16 | Hewlett Packard Enterprise Development Lp | Online file system check |
| CN114978213A (en) * | 2022-05-17 | 2022-08-30 | 重庆邮电大学 | Dynamic gain control system for suppressing impulse noise |
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1999
- 1999-10-15 CN CN 99121929 patent/CN1124696C/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1843010B (en) * | 2003-08-28 | 2012-07-11 | 艾利森电话股份有限公司 | Method and system for adaptable receiver parameters |
| CN100352171C (en) * | 2003-11-22 | 2007-11-28 | Lg电子株式会社 | Apparatus and method for enhancing a reception rate of a receiver with AGC |
| WO2008077274A1 (en) * | 2006-12-25 | 2008-07-03 | Thomson Licensing | Method and device for automatic gain control |
| CN101515807B (en) * | 2008-02-21 | 2012-07-04 | 卓胜微电子（上海）有限公司 | Digital intermediate-frequency receiver |
| CN102655675A (en) * | 2011-03-04 | 2012-09-05 | 联咏科技股份有限公司 | Automatic gain control device and automatic gain control method |
| US10922276B2 (en) | 2014-11-10 | 2021-02-16 | Hewlett Packard Enterprise Development Lp | Online file system check |
| CN108471296A (en) * | 2018-03-07 | 2018-08-31 | 中国电子科技集团公司第三十研究所 | A kind of high-precision speed automatic gain control system suitable for short-term burst transmission |
| CN108471296B (en) * | 2018-03-07 | 2021-09-10 | 中国电子科技集团公司第三十研究所 | High-precision rapid automatic gain control system suitable for short-time burst transmission |
| CN108599781A (en) * | 2018-04-10 | 2018-09-28 | 中国科学院国家空间科学中心 | Detect examination intermediate-frequency receiver to a kind of fpga chip, intermediate frequency demodulation card and satellite data transmission |
| CN109120292A (en) * | 2018-08-06 | 2019-01-01 | 电子科技大学 | A kind of digital automatic gain control system and method |
| CN109120292B (en) * | 2018-08-06 | 2019-11-05 | 电子科技大学 | A kind of digital automatic gain control system and method |
| CN114978213A (en) * | 2022-05-17 | 2022-08-30 | 重庆邮电大学 | Dynamic gain control system for suppressing impulse noise |
| CN114978213B (en) * | 2022-05-17 | 2023-07-25 | 重庆邮电大学 | Dynamic gain control system for suppressing impulse noise |
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