CN1697440A - Automatic gain control device in use for multicarrier receiver - Google Patents
Automatic gain control device in use for multicarrier receiver Download PDFInfo
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- CN1697440A CN1697440A CN 200510072105 CN200510072105A CN1697440A CN 1697440 A CN1697440 A CN 1697440A CN 200510072105 CN200510072105 CN 200510072105 CN 200510072105 A CN200510072105 A CN 200510072105A CN 1697440 A CN1697440 A CN 1697440A
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Abstract
The device includes a radio frequency input module, down-conversion module, first loop of analog-digital composite feedback, second loop of digital feedback, feed forward loop, and base band processing module. The device possesses functions of sampling signals under high ratio of S/N by A/D converter module, extending range of variable gain amplifier, keeping power constant of multicarrier signal from receiver to output to base band under large signal dynamic range so as to meet requirement for power of each multicarrier signal by base band, root mean square detection adopted in power detection module to carry out linearization correction for non linearity of gain.
Description
Technical field
The invention belongs to the wireless mobile telecommunication technology field, be specifically related to be used for the automatic gain control equipment of the multi-carrier receiver of code division multiple access (CDMA) mobile communication system base station.
Background technology
Automatic gain control (AGC) is a crucial part in receiver, and it can improve the dynamic range of link, and makes the analog to digital converter (ADC) that receives link remain on higher signal to noise ratio working condition down-sampling.Automatic gain control at present mainly is the reception link that is applied to single carrier, and integrated level is lower, and cost is higher.Many employings is the non-linear gain adjustment modes in addition, makes that dynamic range internal linear degree is relatively poor.
Accompanying drawing 1 is that traditional simulation automatic gain control (AGC) realizes block diagram, power detection part (18) detects the power of intermediate-freuqncy signal, and and set value of the power compare, comparative result by loop filter (17), is adjusted the gain of variable gain amplifier VGA (13) as feedback quantity.This AGC control mode adopts analogue device, and the consistency of device is relatively poor, and control precision is not high.
Accompanying drawing 2 is that the general conventional modulus mixing AGC that adopts realizes block diagram, intermediate-freuqncy signal is detected in test section (28), be to compare with set point then equally, comparative result by loop filter (27), is adjusted the gain of variable gain amplifier VGA (23) as feedback quantity.
The difference of gain controlling mode shown in Figure 2 and simulation AGC mode shown in Figure 1 is that test section (28), loop filter (27) all are to realize that at numerical portion the consistency of loop is improved, and is applicable to that single carrier receives link.But the gain controlling mode of Fig. 2, because integrated level is lower, cost is still higher.In addition, what VGA adopted is the non-linear gain adjustment modes, makes that dynamic range internal linear degree is relatively poor.
Summary of the invention
The purpose of this invention is to provide a kind of multi-carrier receiver automatic gain control equipment that is used for, this device utilizes logic gate array (FPGA) or digital signal processor (DSP) to realize, by adopting Digital Signal Processing, realize the AGC control of multicarrier, improved the integrated level of receiver, has high conformity simultaneously, the control precision advantages of higher.
The device of a kind of multi-carrier receiver automatic gain control of the present invention (AGC), comprise that radio frequency input module (31), down conversion module (32), modulus mix feedback first loop, digital feedback second loop, feedforward loop circuit and baseband processing module and form, it is characterized in that:
Modulus mixes feedback first loop and is made up of variable gain amplifier (33), analog to digital converter (34), digital down converter (35), power detection module (38), filter (382), second linearity correction module (381), amplitude limit module (380);
Digital feedback second loop is made up of amplitude limit module (380), the remaining module of amplitude limit (383), first linearity correction module (384), filter (382), second linearity correction module (381);
Feedforward loop circuit is used for separate carrier, is made up of feedforward gain module (36), power detection module (38), filter (385);
Wherein, multi-carrier signal that described multi-carrier receiver receives passes through radio frequency input module (31), down conversion module (32), variable gain amplifier (33), digital down converter (35), feedforward gain module (36), baseband processing module formation baseband signal successively.
Above-mentioned automatic gain control equipment of the present invention, it is characterized in that: mix in feedback first loop, digital feedback second loop and the feedforward loop circuit at modulus, have only variable gain amplifier (33) for can numerically controlled analogue device, all the other modules are digital module at analog to digital converter (34) afterwards all.
Above-mentioned automatic gain control equipment of the present invention is characterized in that: modulus mixes feedback first loop, digital feedback second loop comprises shared filter (382), has identical loop characteristics.
Above-mentioned automatic gain control equipment of the present invention is characterized in that: the control signal dynamic range of the corresponding analogue variable gain amplifier of the amplitude limit scope of amplitude limit module (380).
Above-mentioned automatic gain control equipment of the present invention, it is characterized in that: digital feedback second loop is for the control signal in analogue variable gain amplifier (33) control signal gain ranging, its loop gain is constant to be 1, for the control signal that exceeds analogue variable gain amplifier control signal scope, produce gain compensation.
Above-mentioned automatic gain control equipment of the present invention, it is characterized in that: feedforward loop circuit, carrier wave to single separation carries out gain controlling, make it to reach the signal power that base band requires, signal power that baseband portion requires and detected signal power are relatively, comparative result enters feedforward loop circuit as input signal, through filter (385), and the yield value of control feedforward gain module.
Above-mentioned automatic gain control equipment of the present invention is characterized in that: modulus mixes feedback first loop, digital feedback second loop comprises that shared filter (382) is infinite impulse response (IIR) filter.
Above-mentioned automatic gain control equipment of the present invention is characterized in that: the filter in the feedforward loop circuit (385) is the low pass filter of infinite impulse response (IIR).
The device of a kind of multi-carrier receiver automatic gain control of the present invention (AGC) owing to introduce modulus mixing feedback control loop, makes the signal to noise ratio working condition down-sampling that remaining on of ADC is higher; Introduce digital feedback loop, expanded the VGA gain ranging, make whole feedback under the condition of input great dynamic range, keep exporting to the multi-carrier signal power invariability of base band.For each carrier wave of the separation that outputs to base band, adopt feedforward gain control, reach base band to each carrier signal power requirement.Power detection module adopts root mean square to detect in the device of the present invention, and non-linear to the VGA gain carried out the linearisation correction, realizes the linearity adjustment of gain.
Description of drawings
Fig. 1 represents traditional analog automatic gain receiver control structured flowchart;
Fig. 2 represents conventional modulus mixing automatic gain receiver control structured flowchart;
Fig. 3 represents a kind of automatic gain control equipment structured flowchart that is used for multi-carrier receiver of the present invention.
Embodiment
Below in conjunction with accompanying drawing multi-carrier receiver automatic gain control equipment of the present invention is elaborated.
Fig. 3 illustrates a kind of multicarrier AGC receiver block diagram, the multi-carrier signal that receiver receives through radio frequency input module (31), become to intermediate-freuqncy signal by down conversion module (32) frequency conversion, deliver to VGA module (33) and carry out corresponding gain controlling, carry out analog/digital conversion by ADC module (34) then, digital signal after the conversion is delivered to digital down converter module (35) again, Digital Down Converter Module (35) is with each carrier separation, after the feedforward gain module (36) of preceding each carrier wave, be sent to baseband module (37) at last and handle.
The gain controlling of VGA realizes by two feedback control loops.Wherein, the modulus mixing feedback control loop formed by VGA (33), ADC (34), digital down converter (35), power detection module (38), filter (382), linearity correction 2 modules (381) and amplitude limit module (380) of loop 1; The digital feedback loop that loop 2 is made up of amplitude limit module (380), the remaining module of amplitude limit (383), linearity correction 1 module (384), filter (382), linearity correction 2 modules (381).The gain of VGA (33) is level control, and amplitude limit module (380) wherein is used to limit the up-and-down boundary of the control level of VGA; The remaining module of amplitude limit (383), the extraneous control level of output saturation limiting.Power detection module (38) detects the power of each carrier wave.In feedback loop, what VGA adjusted is the signal power of multicarrier, so detected object is the signal power of multicarrier.The output that the power addition of detected each carrier wave and the reference power that is provided with and loop 2 neutral lines are proofreaied and correct 1 module is compared, and the result enters into loop 1 as feedback quantity.For the signal that exceeds VGA gain border, produce gain compensation by loop 2.Specifically, the remaining module of amplitude limit can produce the feedback greater than 0 in this case, is input to loop 2, produces the gain of compensation.Amplitude limit module (380) wherein is the saturation limiting module, and its amplitude limit scope is corresponding with the scope of variable gain amplifier control signal.In the device of the present invention, be digital circuit in analog-to-digital conversion module (34) all modules afterwards and carry out.Filter (382) in this device in the feedback control loop is infinite impulse response (IIR) filter, and the filter in the feedforward loop circuit (385) is infinite impulse response (IIR) low pass filter.
Feedforward loop circuit is made up of feedforward gain module (36), power detection module (38) and filter (385).Power detection module (38), detect the power of each carrier wave, compare with the desired signal power of base band then, error is input to corresponding low pass filter (385), obtain the feedforward gain of each carrier signal correspondence, next each carrier signal can reach the desired signal power of base band by the gain compensation of feedforward gain module (36).
VGA gain and control level exponent function relation, linearity correction module 2 (381) to this non-linear gain adjustment, is carried out linearisation and is proofreaied and correct.Concrete grammar is to introduce the inverse operation of exponent arithmetic in loop, i.e. logarithm operation.Linearity correction module 2 (381) and linearity correction module 1 (384), important to the influence of whole AGC loop characteristics, corresponding with the mode that root mean square of the present invention detects, realize the Linear Control that gains.
Because the CDMA mobile communication system up link is when user terminal UE inserts, there is the situation of bursting in base station received signal power, and instantaneous dynamic range changes greatly.In automatic gain control equipment of the present invention, loop 1 and loop 2 as feedback control loop are quick feedback loop, can respond received signal power fast and in great dynamic range, change, and the feedforward loop circuit in the automatic gain control equipment of the present invention helps improving control precision for encircling slowly.
Claims (8)
1. the device of multi-carrier receiver automatic gain control (AGC), comprise that radio frequency input module (31), down conversion module (32), modulus mix feedback first loop, digital feedback second loop, feedforward loop circuit and baseband processing module and form, it is characterized in that:
Modulus mixes feedback first loop and is made up of variable gain amplifier (33), analog to digital converter (34), digital down converter (35), power detection module (38), filter (382), second linearity correction module (381), amplitude limit module (380);
Digital feedback second loop is made up of amplitude limit module (380), the remaining module of amplitude limit (383), first linearity correction module (384), filter (382), second linearity correction module (381);
Feedforward loop circuit is used for separate carrier, is made up of feedforward gain module (36), power detection module (38), filter (385);
Wherein, multi-carrier signal that described multi-carrier receiver receives passes through radio frequency input module (31), down conversion module (32), variable gain amplifier (33), digital down converter (35), feedforward gain module (36), baseband processing module formation baseband signal successively.
2. automatic gain control equipment as claimed in claim 1, it is characterized in that: mix in feedback first loop, digital feedback second loop and the feedforward loop circuit at modulus, have only variable gain amplifier (33) for can numerically controlled analogue device, all the other modules are digital module at analog to digital converter (34) afterwards all.
3. automatic gain control equipment as claimed in claim 1 is characterized in that: modulus mixes feedback first loop, digital feedback second loop comprises shared filter (382), has identical loop characteristics.
4. automatic gain control equipment according to claim 1 is characterized in that: the control signal dynamic range of the corresponding analogue variable gain amplifier of the amplitude limit scope of amplitude limit module (380).
5. automatic gain control equipment according to claim 1, it is characterized in that: digital feedback second loop is for the control signal in analogue variable gain amplifier (33) control signal gain ranging, its loop gain is constant to be 1, for the control signal that exceeds analogue variable gain amplifier control signal scope, produce gain compensation.
6. automatic gain control equipment according to claim 1, it is characterized in that: feedforward loop circuit, carrier wave to single separation carries out gain controlling, make it to reach the signal power that base band requires, signal power that baseband portion requires and detected signal power are relatively, comparative result enters feedforward loop circuit as input signal, through filter (385), and the yield value of control feedforward gain module.
7. as automatic gain control equipment as described in the claim 3, it is characterized in that: modulus mixes feedback first loop, digital feedback second loop comprises that shared filter (382) is infinite impulse response (IIR) filter.
8. as automatic gain control equipment as described in the claim 5, it is characterized in that: the filter in the feedforward loop circuit (385) is the low pass filter of infinite impulse response (IIR).
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007140664A1 (en) * | 2006-05-30 | 2007-12-13 | Huawei Technologies Co., Ltd. | A receiver and method for receiving wireless signal |
| WO2009092177A1 (en) * | 2008-01-21 | 2009-07-30 | Utstarcom Telecom Co., Ltd. | An apparatus and method for realizing automatic gain control in orthogonal frequency division multiple access system |
| CN100527718C (en) * | 2006-03-31 | 2009-08-12 | 北京威讯紫晶科技有限公司 | Automatic gain control method for receiving data in short distance radio network |
| CN101188590B (en) * | 2007-08-21 | 2011-12-28 | 京信通信系统（中国）有限公司 | Digital downlink frequency conversion system and digital downlink frequency conversion method in multi-carrier signal processing |
| CN101378263B (en) * | 2007-08-31 | 2012-07-04 | 京信通信系统（中国）有限公司 | Multi-carrier digital receiver based on digital intermediate frequency and multi-carrier digital receive method |
| CN103188191A (en) * | 2011-12-28 | 2013-07-03 | 中兴通讯股份有限公司 | Multi-carrier receiver and gain calibration method thereof |
| CN102035578B (en) * | 2009-09-29 | 2014-03-12 | 中兴通讯股份有限公司南京分公司 | Automatic grain control method and device for diversity receiving |
| CN102035487B (en) * | 2009-09-29 | 2014-06-18 | 中兴通讯股份有限公司南京分公司 | Automatic gain control method and device for diversity reception |
| CN104184531A (en) * | 2014-09-02 | 2014-12-03 | 广州山锋测控技术有限公司 | Shortwave signal gain control method and system |
| WO2015054860A1 (en) * | 2013-10-17 | 2015-04-23 | Telefonaktiebolaget L M Ericsson (Publ) | Method and apparatus for automatic gain control |
| CN104756402A (en) * | 2012-11-07 | 2015-07-01 | 高通股份有限公司 | Gain control for intra-band carrier aggregation |
| CN104954033A (en) * | 2015-05-29 | 2015-09-30 | 复旦大学 | Rapid automatic gain control circuit and method for OFDM (orthogonal frequency division multiplexing) system |
| CN106712804A (en) * | 2016-12-30 | 2017-05-24 | 陕西烽火电子股份有限公司 | Frequency-hopping receiving channel quick gain control system |
| CN106980289A (en) * | 2017-03-24 | 2017-07-25 | 重庆彦鼎科技有限公司 | A kind of multifunctional ground station calibrating signal generator |
| CN109672638A (en) * | 2017-10-16 | 2019-04-23 | 亚德诺半导体无限责任公司 | Automatic growth control (AGC) subcarrier offset correction |
| CN110161440A (en) * | 2019-04-29 | 2019-08-23 | 上海东软医疗科技有限公司 | A kind of receiver, signal acceptance method and MR imaging apparatus |
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2005
- 2005-05-25 CN CNB2005100721059A patent/CN100521672C/en active Active
Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100527718C (en) * | 2006-03-31 | 2009-08-12 | 北京威讯紫晶科技有限公司 | Automatic gain control method for receiving data in short distance radio network |
| US8194788B2 (en) | 2006-05-30 | 2012-06-05 | Huawei Technologies Co., Ltd. | Receiver and method for receiving wireless signals |
| WO2007140664A1 (en) * | 2006-05-30 | 2007-12-13 | Huawei Technologies Co., Ltd. | A receiver and method for receiving wireless signal |
| CN101188590B (en) * | 2007-08-21 | 2011-12-28 | 京信通信系统（中国）有限公司 | Digital downlink frequency conversion system and digital downlink frequency conversion method in multi-carrier signal processing |
| CN101378263B (en) * | 2007-08-31 | 2012-07-04 | 京信通信系统（中国）有限公司 | Multi-carrier digital receiver based on digital intermediate frequency and multi-carrier digital receive method |
| WO2009092177A1 (en) * | 2008-01-21 | 2009-07-30 | Utstarcom Telecom Co., Ltd. | An apparatus and method for realizing automatic gain control in orthogonal frequency division multiple access system |
| CN102035578B (en) * | 2009-09-29 | 2014-03-12 | 中兴通讯股份有限公司南京分公司 | Automatic grain control method and device for diversity receiving |
| CN102035487B (en) * | 2009-09-29 | 2014-06-18 | 中兴通讯股份有限公司南京分公司 | Automatic gain control method and device for diversity reception |
| CN103188191A (en) * | 2011-12-28 | 2013-07-03 | 中兴通讯股份有限公司 | Multi-carrier receiver and gain calibration method thereof |
| CN104756402A (en) * | 2012-11-07 | 2015-07-01 | 高通股份有限公司 | Gain control for intra-band carrier aggregation |
| CN104756402B (en) * | 2012-11-07 | 2018-04-24 | 高通股份有限公司 | Gain for intralband carrier aggregation controls |
| WO2015054860A1 (en) * | 2013-10-17 | 2015-04-23 | Telefonaktiebolaget L M Ericsson (Publ) | Method and apparatus for automatic gain control |
| US9813038B2 (en) | 2013-10-17 | 2017-11-07 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and apparatus for automatic gain control |
| CN104184531A (en) * | 2014-09-02 | 2014-12-03 | 广州山锋测控技术有限公司 | Shortwave signal gain control method and system |
| CN104954033A (en) * | 2015-05-29 | 2015-09-30 | 复旦大学 | Rapid automatic gain control circuit and method for OFDM (orthogonal frequency division multiplexing) system |
| CN104954033B (en) * | 2015-05-29 | 2017-07-28 | 复旦大学 | A kind of speed automatic gain for ofdm system controls circuit and method |
| CN106712804A (en) * | 2016-12-30 | 2017-05-24 | 陕西烽火电子股份有限公司 | Frequency-hopping receiving channel quick gain control system |
| CN106712804B (en) * | 2016-12-30 | 2024-04-09 | 陕西烽火电子股份有限公司 | Quick gain control system for frequency hopping receiving channel |
| CN106980289A (en) * | 2017-03-24 | 2017-07-25 | 重庆彦鼎科技有限公司 | A kind of multifunctional ground station calibrating signal generator |
| CN109672638A (en) * | 2017-10-16 | 2019-04-23 | 亚德诺半导体无限责任公司 | Automatic growth control (AGC) subcarrier offset correction |
| CN109672638B (en) * | 2017-10-16 | 2021-07-30 | 亚德诺半导体无限责任公司 | Automatic Gain Control (AGC) assisted carrier offset correction |
| CN110161440A (en) * | 2019-04-29 | 2019-08-23 | 上海东软医疗科技有限公司 | A kind of receiver, signal acceptance method and MR imaging apparatus |
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| CN100521672C (en) | 2009-07-29 |
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