CN103023852B - Fast digital automatic gain control method for orthogonal frequency division multiplexing receiver - Google Patents
Fast digital automatic gain control method for orthogonal frequency division multiplexing receiver Download PDFInfo
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Abstract
The invention discloses a fast digital automatic gain control method for an orthogonal frequency division multiplexing receiver. The method includes three functional steps of signal acquisition, signal detection and gain control, wherein the signal acquisition step includes converting RSSI (received signal strength indication) signals to digital signals via an ADC (analog to digital converter), averaging sampled signals, and submitting an average signal to the detection steps; the signal detection step includes detecting an OFDM (orthogonal frequency division multiplexing) signal frame, detecting a signal frame header and a frame end according to a signal threshold, and judging whether submitting the average signal to the gain control step or not; and the gain control step includes setting a reasonable LNA (low-noise amplifier) level and VGA (variable gain amplifier) gain according to the average signal. The method performs fast gain control for wide-range input signals to enable OFDM symbol signals to be stable, frame synchronization complexity is lowed, influences of the OFDM system peak-to-average ratio on RSSI are overcome, and influences of multiple burrs of the RSSI are eliminated.
Description
Technical field
The invention belongs to wireless communication technique field, be specifically related to a kind of implementation method and the software flow that are applicable to the automatic growth control (AGC) of ofdm system wireless receiver.
Background technology
In wireless telecommunication system, the radiofrequency signal that transmitter produces is transferred to receiver through wireless channel, due to path attenuation and shade impact, signal will inevitably change in a very large scope, control in a metastable scope to make the Received signal strength amplitude entering into digital to analog converter, need the gain amplifier different to varying strength signal setting, be both unlikely to saturated during to ensure the signal entering digital to analog converter and be also unlikely to too little.
Gain Automatic control AGC is mainly divided into two large classes, and a class is simulation AGC, and another kind of is digital AGC.Simulation AGC is the amplitude of radio-frequency head by analog circuit detection Received signal strength, automatically generates corresponding feedback adjusting voltage according to the amplitude detected, and then the variable gain control voltage of adjustment radio frequency reception amplifier, makes Received signal strength amplitude meet demodulation requirement.Digital AGC is that baseband signal processing module detects the digital signal amplitude received, corresponding required VGA yield value is calculated by digital algorithm, control the variable gain control voltage of radio frequency reception amplifier according to yield value, make Received signal strength amplitude meet demodulation requirement.Because digital AGC hardware implementing is simple, regulate the speed fast, portable strong, obtain more and more wider application.
OFDM orthogonal frequency division multiplexi is that whole transmission broadband is divided into a series of mutually orthogonal subcarrier, as long as the bandwidth shared by single sub-carrier is enough narrow, channel frequency response on it can be considered it is smooth, whereby frequency selective fading channels is converted into the sub-carrier channels of a series of flat fading.Before each time-domain OFDM symbol is sent to transmission, adds and be greater than the extended cyclic prefix of channel maximum delay, can eliminate in radio communication because the channel multi-path severe inter-symbol caused that decline disturbs.Ofdm system obtains more and more extensive use in recent years, and such as Wimax and LTE have employed this technology.But affect comparatively large by signal amplitude size due to OFDM receiver performance, therefore need to carry out automatic growth control in receivers, Received signal strength amplitude is adjusted in OK range automatically.
Summary of the invention
Technical problem: in order to solve the problem, the invention provides a kind of automatic control that can realize rapid abutting joint collection of letters gain amplifier within the scope of wider received power, ageing good, the fast digital automatic gain control method for OFDM receiver that overcomes impact that burr signal brings, reduce the synchronous redundant overheads of received frame.
Technical scheme: the fast digital automatic gain control method for OFDM receiver of the present invention, comprises signals collecting step, signal detection step and the gain rate-determining steps of running simultaneously.
1), in described signals collecting step, following flow process is constantly repeated:
11) system enable after, to through analog to digital converter conversion after received signal strength indicator digital signal gather;
12) get a fixed sample to count M, described received signal strength indicator digital signal is averaged, obtains mean value signal and submit to signal detection step;
2) in described signal detection step, after getting mean value signal, base band quadrature frequency division multiplexed symbols frame is detected, when detecting step judges frame head and the postamble of the corresponding OFDM symbol of this mean value signal, this average is submitted to gain rate-determining steps, and do not submit to when judging corresponding OFDM symbol, burr or carrier wave, idiographic flow is:
21) obtain mean value signal, remove controllable gain amplifier gain and end mark is set, judge whether mean value signal is greater than lowest signal threshold value, in this way, then enter step 22a after N time of delay), otherwise enter step 23a);
22a) judge whether mean value signal is greater than lowest signal threshold value, in this way, then enter step 22b), otherwise get back to step 21);
22b) judge that controllable gain amplifier gain arranges mark whether set, in this way, then get back to step 21), otherwise enter step 22c);
22c) judge whether LNA gear changes, in this way, then get back to 22a after upgrading LNA gear record), otherwise mean value signal is submitted to gain rate-determining steps;
23a) judge that controllable gain amplifier gain arranges mark whether set, in this way, then enter step 23b after N time of delay), otherwise get back to 21);
23b) judge whether mean value signal is greater than lowest signal threshold value, in this way, then get back to step 21), otherwise mean value signal is submitted to gain rate-determining steps after arranging end mark by the gain of set controllable gain amplifier;
3) mean value signal submitted to according to signal detection step of gain rate-determining steps, arrange LNA gear and controllable gain amplifier gain to control gain of received signal, idiographic flow is:
31) obtain the mean value signal received, remove controllable gain amplifier gain and mark is set;
32) judge whether LNA gear mark is most high tap position, in this way, then enters step 33a), otherwise enter 34a);
33a) judge whether mean value signal meets V>=V
hmax, wherein V represents mean value signal, V
hmaxrepresent most receiving signal intensity indication signal corresponding to high tap position maximal input, in this way, then LNA reduced a gear, after LNA gear mark is set, get back to step 31), otherwise enter 33b);
33b) judge whether mean value signal meets V
hmin≤ V≤V
hmax, wherein V represents mean value signal, V
hminrepresent the receiving signal intensity indication signal that the most high-grade minimum power input is corresponding, V
hmaxrepresent the receiving signal intensity indication signal that most high tap position maximal input is corresponding, in this way, then LNA gear is set to most high tap position, and by inquire-receive signal intensity indication signal and input signal strength relation table and controllable gain amplifier gain and input signal strength relation table, step 37 is entered after setting controllable gain amplifier yield value), otherwise enter step 33c after LNA gear being set to most high tap position);
33c) judge that controllable gain amplifier gain arranges end mark whether set, in this way, then get back to step 31), otherwise enter step 37 after controllable gain amplifier yield value is set to maxgain value);
34) judge whether LNA gear mark is lowest gear, if then enter step 35a), otherwise enter step 36a);
35a) judge whether mean value signal meets V≤V
lmin, wherein V represents mean value signal, V
lminrepresent and if so, then LNA increased the receiving signal intensity indication signal magnitude of voltage that lowest gear minimum power input is corresponding a gear, gear mark is set, gets back to step 31), otherwise enter step 35b);
35b) judge whether mean value signal meets V
lmin≤ V≤V
lmax, wherein V represents mean value signal, V
lminrepresent the receiving signal intensity indication signal that lowest gear minimum power input is corresponding, V
lmaxrepresent and if so, then LNA gear is set to lowest gear by the receiving signal intensity indication signal that lowest gear maximal input is corresponding, and by entering step 37 after setting controllable gain amplifier yield value of tabling look-up), otherwise enter 35c);
35c) judge that controllable gain amplifier gain arranges end mark whether set, in this way, then LNA gear be set to most high tap position, get back to step 31), otherwise enter step 37 after controllable gain amplifier yield value is set to maxgain value)
36a) judge whether mean value signal meets V
mmin≤ V≤V
mmax, wherein V represents mean value signal, V
mminrepresent that LNA gear mark represents the receiving signal intensity indication signal corresponding to minimum power input of gear, V
mmaxrepresent that LNA gear mark represents the receiving signal intensity indication signal corresponding to maximal input of gear, if so, then LNA gear is set to gear mark and represents gear, controllable gain amplifier gain is set by tabling look-up, enter step 37), otherwise enter step 36b);
36b) judge whether mean value signal meets V>=V
mmax, wherein V represents mean value signal, V
mmaxrepresent that LNA gear mark represents the receiving signal intensity indication signal corresponding to maximal input of gear, if so, then LNA gear reduced a gear, after gear mark is set, get back to step 31), otherwise enter 36c);
36c) judge that controllable gain amplifier gain arranges end mark whether set, in this way, then LNA gear is set to most high tap position, gear mark is set, get back to step 31), otherwise LNA gear is increased a gear, get back to step 31 after gear mark is set);
37) gain of set controllable gain amplifier arranges the rear finishing control flow process of mark.
2. in signal detection step described in, mean value signal is still greater than lowest signal threshold value after being greater than lowest signal threshold value time delay N and controllable gain amplifier gain arranges the non-set of the mark Received signal strength that then this mean value signal is corresponding is OFDM symbol frame head, and mean value signal is little to be arranged mark with lowest signal threshold value controllable gain amplifier mean value signal has still been less than the lowest signal threshold value Received signal strength that then this mean value signal is corresponding after set time delay N is OFDM symbol postamble;
In the present invention, the method to set up of lowest signal threshold value is: the minimum value measuring input signal strength index signal corresponding to receiver identifiable design minimum power input signal OFDM symbol, and this value is minimum signal threshold value;
Time of delay, the setting of N met the following conditions: measure corresponding to the duration of receiving signal intensity indication signal corresponding to burr, OFDM symbol frame head rising edge input signal strength index signal time, OFDM symbol postamble trailing edge corresponding input signal strength index signal time, and time of delay, N must be greater than above-mentioned three maximums recording the time.
In step 3) of the present invention, receiving signal intensity indication signal and input signal strength relation table obtain by inquiring about chip data handbook or measuring;
Described controllable gain amplifier yield value and input signal strength relation table obtain by the following method:
According to the requirement of receiver system optimum Working, setting adjustment OFDM symbol amplitude target value, fixing LNA gear, change controllable gain amplifier gain, desired value is reached with OFDM symbol amplitude after making adjustment, record yield value within the scope of the corresponding input signal power of each LNA gear value successively, record, makes relation table.
In step 3) of the present invention, when LNA gear is in most high tap position, LNA gain amplifier is maximum, and when being in lowest gear, LNA gain amplifier is minimum.
Beneficial effect: the present invention compared with prior art, has the following advantages:
The inventive method can realize the automatic control of rapid abutting joint collection of letters gain amplifier in wider received power scope, make Received signal strength amplitude after this technological system control treatment keep basicly stable, ensure that subsequent treatment can normally be carried out.
The inventive method ageing good, overcome impact that burr signal brings, reduce carrier signal and to fluctuate the synchronous redundant overheads of OFDM received frame caused.
The inventive method, when collection signal, confirms as the sampled point of signal, judgement of sampling again after carrying out time delay for gathering, and can eliminate the impact of the burr signal on RSSI signal that OFDM semi-duplex communication system causes due to Transmit enable.
In the inventive method, by again the average of RSSI being submitted to VGA rate-determining steps after shorter time delay, VGA can be made to control more accurate, reducing the fluctuation of OFDM time-domain signal, reduce the difficulty of OFDM received frame synchronization module threshold value setting.
In the inventive method, average by M point, comparatively short time delay N, table lookup operation avoids loaded down with trivial details accurate Calculation and ensures the rapidity that algorithm is implemented, VGA control procedure can be accomplished in the Cyclic Prefix of OFDM, OFDM symbol frame first OFDM symbol can correctly receive, and does not increase the expense of ofdm system.
Accompanying drawing explanation
Fig. 1 is auto gain control method functional block diagram fast;
Fig. 2 is auto gain control method flow chart fast;
Fig. 3 is MAX shelves input signal strength and RSSI graph of a relation;
Fig. 4 is MAX shelves input signal strength and VGA graph of a relation;
Fig. 5 is MAX-16 shelves input signal strength and RSSI graph of a relation;
Fig. 6 is MAX-16 shelves input signal strength and VGA graph of a relation.
Embodiment
Below in conjunction with drawings and Examples, the inventive method is done and illustrates further.
Fast digital automatic gain control method for OFDM receiver of the present invention, comprises signals collecting, input and gain and controls three steps:
Receiver system enable signal acquisition step, gathers the RSSI digital signal after ADC conversion, gets the fixed sample M that counts and does on average, mean value signal is submitted to signal detection step;
After signal detection step gets mean value signal, baseband OFDM symbols frame is detected, when detecting step judges the corresponding OFDM symbol frame head of this mean value signal and postamble, then this mean value signal is submitted to gain rate-determining steps, and do not submit to when being judged to be OFDM symbol, burr or carrier wave;
The average voltage that gain rate-determining steps is submitted to according to signal detection step, arranges suitable LNA gear and VGA gain to control gain of received signal.
As a preferred embodiment of the present invention, signals collecting in auto gain control method, input and agc algorithm, can select hardware chip such as field programmable gate array (FPGA), digital signal processing chip (DSP) realization, micro controller unit (MCU) to realize.
Below in conjunction with accompanying drawing, an embodiment is described, this embodiment makes following setting according to its own system feature:
Arranging number of sampling M is 32 points;
Arranging time delay N is 3.8us;
Arranging input signal strength index signal is RSSI voltage;
Arranging the most high tap position of LNA is MAX shelves, and the maximum input intensity of MAX shelves is-60dBm, and minimum input intensity is-80dBm;
Arranging LNA deep low gear gear is MAX-16 shelves, and the maximum input intensity of MAX-16 shelves is-27dBm, and maximum input intensity is-65dBm;
LNA gear is set and only gets 2 grades and MAX shelves, MAX-16 shelves, eliminate intervening gears; Therefore, in idiographic flow, judge whether LNA gear mark is the most high-grade, as otherwise must be deep low gear, so whether eliminate gear mark is the judgement of lowest gear and intervening gears, and all follow-up process step of intervening gears.
Arranging controllable gain amplifier yield value VGA maximum gain is 2 ' h0d, and least gain is 2 ' h1f;
Signals collecting in auto gain control method, input and gain control flow are as follows:
Signals collecting:
System enable signal acquisition step, this step is started working, and does at 32 on average, this mean value signal is submitted to signal detection step, constantly repeats this process, until this step is by system closure after RSSI signals collecting;
Input:
A. get RSSI mean value, remove VGA and end mark is set;
B. judge that whether mean value signal is more than 400mV, exceedes, assert that receiving signal carries out following step c, does not exceed, assert and do not receive signal, carry out following step f;
C. time delay 3.8us, overcomes the impact of RSSI signal burr, until RSSI stablizes;
D. according to new RSSI average, judge whether more than 400mV.If exceeded, then first judge that VGA arranges flag bit whether set, if following step e is carried out in non-set, otherwise repeat above-mentioned steps b;
E. continue to judge whether LNA gear mark changes, and does not change, and immediately RSSI average is submitted to gain rate-determining steps, otherwise upgrade LNA gear record, repeat steps d according to new RSSI average;
F.RSSI average, lower than 400mV, judges that VGA arranges flag bit, if do not arrange, then repeats step a.If arrange, time delay 3.8us, guarantees OFDM symbol frame end to be detected, carries out following step g;
G. judge that whether mean value signal is more than 400mV, if then carry out step a, otherwise set VGA end mark, RSSI average is submitted to gain rate-determining steps.
Gain controls:
Gain control process:
1. get the RSSI average of submission, remove VGA and mark is set, carry out following step 2.;
2. judge whether LNA gear mark is MAX shelves, if it is carries out following step 3., otherwise carries out following step 6.;
3. judge whether RSSI average is greater than the corresponding RSSI magnitude of voltage of MAX shelves-60dBm, is carry out following step 4., otherwise to arrange LNA gear be MAX shelves, upgrade LNA gear mark, repeat above-mentioned steps 1.;
4. judge whether RSSI average is in RSSI voltage range interval corresponding to MAX shelves-80 ~-60dBm, if then arranging gear is MAX shelves, by setting VGA value of tabling look-up, set VGA arranges mark, upgrades LNA gear mark; Otherwise carry out step 5.;
5. arranging gear is MAX shelves, judges that VGA arranges end mark whether set, if then carry out above-mentioned steps 1.; Otherwise arranging VGA value is 2 ' h0d, and set VGA arranges mark;
6. judge whether RSSI average is less than MAX-16 shelves-65dBmSSI magnitude of voltage, then arranging gear is in this way MAX shelves, upgrades LNA gear mark, gets back to step 1., otherwise carry out following step 7.;
7. judge whether RSSI average is in RSSI voltage range interval corresponding to MAX-16 shelves-65 ~-27dBm, if then arranging gear is MAX-16 shelves, upgrade LNA gear mark, by setting VGA value of tabling look-up, set VGA arranges mark; Otherwise carry out following step 8.;
8. judge that VGA arranges end mark whether set, if then arranging LNA gear is MAX shelves, upgrades gear mark and get back to step 1., otherwise to arrange LNA gear be MAX-16 shelves, upgrade LNA gear mark, then to arrange controllable gain amplifier gain be 2 ' h1f.
The design of table and look-up method:
By setting VGA value of tabling look-up in above-mentioned gain control process, concrete operations are as follows:
Due under certain LNA gear, RSSI can indicative input signal strength signal intensity linearly, signal strength signal intensity and VGA gain one_to_one corresponding, measure good all RSSI and the relation table of signal strength signal intensity and the relation table of signal strength signal intensity and VGA, RSSI and signal strength signal intensity relation table and signal strength signal intensity and VGA relation table are shown in Fig. 3,4,5,6.
Claims (5)
1., for a fast digital automatic gain control method for OFDM receiver, the method comprises signals collecting step, signal detection step and the gain rate-determining steps of running simultaneously, and it is characterized in that:
1), in described signals collecting step, following flow process is constantly repeated:
11) system enable after, to through analog to digital converter conversion after received signal strength indicator digital signal gather;
12) get a fixed sample to count M, described received signal strength indicator digital signal is averaged, obtains mean value signal and submit to signal detection step;
2) in described signal detection step, after getting mean value signal, base band quadrature frequency division multiplexed symbols frame is detected, when detecting step judges frame head and the postamble of the corresponding OFDM symbol of this mean value signal, this mean value signal is submitted to gain rate-determining steps, and do not submit to when judging corresponding OFDM symbol, burr or carrier wave, idiographic flow is:
21) obtain mean value signal, remove controllable gain amplifier gain and end mark is set, judge whether mean value signal is greater than lowest signal threshold value, in this way, then enter step 22a after N time of delay), otherwise enter step 23a);
22a) judge whether mean value signal is greater than lowest signal threshold value, in this way, then enter step 22b), otherwise get back to step 21);
22b) judge that controllable gain amplifier gain arranges mark whether set, in this way, then get back to step 21), otherwise enter step 22c);
22c) judge whether LNA gear changes, in this way, then get back to 22a after upgrading LNA gear record), otherwise mean value signal is submitted to gain rate-determining steps;
23a) judge that controllable gain amplifier gain arranges mark whether set, in this way, then enter step 23b after N time of delay), otherwise get back to 21);
23b) judge whether mean value signal is greater than lowest signal threshold value, in this way, then get back to step 21), otherwise mean value signal is submitted to gain rate-determining steps after arranging end mark by the gain of set controllable gain amplifier;
3) mean value signal submitted to according to signal detection step of gain rate-determining steps, arrange LNA gear and controllable gain amplifier gain to control gain of received signal, idiographic flow is:
31) obtain the mean value signal received, remove controllable gain amplifier gain and mark is set;
32) judge whether LNA gear mark is most high tap position, in this way, then enters step 33a), otherwise enter 34);
33a) judge whether mean value signal meets V>=V
hmax, wherein V represents mean value signal, V
hmaxrepresent most receiving signal intensity indication signal corresponding to high tap position maximal input, in this way, then LNA reduced a gear, after LNA gear mark is set, get back to step 31), otherwise enter 33b);
33b) judge whether mean value signal meets V
hmin≤ V≤V
hmax, wherein V represents mean value signal, V
hminrepresent the receiving signal intensity indication signal that the most high-grade minimum power input is corresponding, V
hmaxrepresent the receiving signal intensity indication signal that most high tap position maximal input is corresponding, in this way, then LNA gear is set to most high tap position, and by inquire-receive signal intensity indication signal and input signal strength relation table and controllable gain amplifier gain and input signal strength relation table, step 37 is entered after setting controllable gain amplifier yield value), otherwise enter step 33c after LNA gear being set to most high tap position);
33c) judge that controllable gain amplifier gain arranges end mark whether set, in this way, then get back to step 31), otherwise enter step 37 after controllable gain amplifier yield value is set to maxgain value);
34) judge whether LNA gear mark is lowest gear, if then enter step 35a), otherwise enter step 36a);
35a) judge whether mean value signal meets V≤V
lmin, wherein V represents mean value signal, V
lminrepresent and if so, then LNA increased the receiving signal intensity indication signal magnitude of voltage that lowest gear minimum power input is corresponding a gear, gear mark is set, gets back to step 31), otherwise enter step 35b);
35b) judge whether mean value signal meets V
lmin≤ V≤V
lmax, wherein V represents mean value signal, V
lminrepresent the receiving signal intensity indication signal that lowest gear minimum power input is corresponding, V
lmaxrepresent and if so, then LNA gear is set to lowest gear by the receiving signal intensity indication signal that lowest gear maximal input is corresponding, and by entering step 37 after setting controllable gain amplifier yield value of tabling look-up), otherwise enter 35c);
35c) judge that controllable gain amplifier gain arranges end mark whether set, in this way, then LNA gear be set to most high tap position, get back to step 31), otherwise enter step 37 after controllable gain amplifier yield value is set to maxgain value);
36a) judge whether mean value signal meets V
mmin≤ V≤V
mmax, wherein V represents mean value signal, V
mminrepresent that LNA gear mark represents the receiving signal intensity indication signal corresponding to minimum power input of gear, V
mmaxrepresent that LNA gear mark represents the receiving signal intensity indication signal corresponding to maximal input of gear, if, then LNA gear is set to the gear that gear mark represents, controllable gain amplifier gain is set by tabling look-up, enter step 37), otherwise enter step 36b);
36b) judge whether mean value signal meets V>=V
mmax, wherein V represents mean value signal, V
mmaxrepresent that LNA gear mark represents the receiving signal intensity indication signal corresponding to maximal input of gear, if so, then LNA gear reduced a gear, after gear mark is set, get back to step 31), otherwise enter 36c);
36c) judge that controllable gain amplifier gain arranges end mark whether set, in this way, then LNA gear is set to most high tap position, gear mark is set, get back to step 31), otherwise LNA gear is increased a gear, get back to step 31 after gear mark is set);
37) gain of set controllable gain amplifier arranges the rear finishing control flow process of mark.
2. the fast digital automatic gain control method for OFDM receiver according to claim 1, it is characterized in that, in described signal detection step, if mean value signal is greater than lowest signal threshold value, after time of delay N, mean value signal is still greater than lowest signal threshold value, and controllable gain amplifier gain arranges the non-set of mark, then judge that the Received signal strength that this mean value signal is corresponding is OFDM symbol frame head;
If mean value signal is less than lowest signal threshold value, controllable gain amplifier arranges mark set, and after time of delay N, mean value signal is still less than lowest signal threshold value, then judge that the Received signal strength that this mean value signal is corresponding is OFDM symbol postamble.
3. the fast digital automatic gain control method for OFDM receiver according to claim 1, it is characterized in that, the method to set up of described lowest signal threshold value is: the minimum value measuring input signal strength index signal corresponding to receiver identifiable design minimum power input signal OFDM symbol, and this value is minimum signal threshold value;
Described time of delay, the setting of N met the following conditions: measure corresponding to the duration of the corresponding input signal strength index signal of burr, OFDM symbol frame head rising edge input signal strength index signal time, OFDM symbol postamble trailing edge corresponding input signal strength index signal time, and time of delay, N must be greater than above-mentioned three maximums recording the time.
4. the fast digital automatic gain control method for OFDM receiver according to claim 1, it is characterized in that, described step 3) in, receiving signal intensity indication signal and input signal strength relation table obtain by inquiring about chip data handbook or measuring;
Described controllable gain amplifier yield value and input signal strength relation table obtain by the following method:
According to the requirement of receiver system optimum Working, setting adjustment OFDM symbol amplitude target value, fixing LNA gear, change controllable gain amplifier gain, desired value is reached with OFDM symbol amplitude after making adjustment, record yield value within the scope of the corresponding input signal power of each LNA gear value successively, record, makes relation table.
5. the fast digital automatic gain control method for OFDM receiver according to claim 1, is characterized in that, described step 3) in, when LNA gear is in most high tap position, LNA gain amplifier is maximum, and when being in lowest gear, LNA gain amplifier is minimum.
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| 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 |
| CN107645283B (en) * | 2016-07-19 | 2021-06-01 | 炬芯科技股份有限公司 | Automatic gain control method and device |
| CN108155913B (en) * | 2018-01-12 | 2019-11-15 | 福建飞通通讯科技股份有限公司 | FM signal squelch method, apparatus and system |
| CN112235227B (en) * | 2020-10-16 | 2023-04-07 | 紫光展锐(重庆)科技有限公司 | Method, device and equipment for determining receiving gain and storage medium |
| CN113163427B (en) * | 2021-05-17 | 2022-08-05 | 深圳市友华通信技术有限公司 | Method for adjusting anti-interference parameters of wireless local area network |
| CN116634537B (en) * | 2023-06-01 | 2024-01-23 | 北京联盛德微电子有限责任公司 | Automatic power control method and system of WIFI receiver |
| CN117081687B (en) * | 2023-10-10 | 2023-12-15 | 四川思凌科微电子有限公司 | RSSI data sampling method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101257472A (en) * | 2008-04-09 | 2008-09-03 | 浙江大学 | Orthogonal frequency division multiplexing receiver system and its automatic gain control method |
| CN101895507A (en) * | 2010-08-09 | 2010-11-24 | 复旦大学 | Orthogonal frequency division multiplexing receiver system and automatic gain control method thereof |
| CN101964774A (en) * | 2010-10-14 | 2011-02-02 | 信源通科技（西安）有限公司 | Automatic gain control method and control circuit suitable for orthogonal frequency division multiplexing (OFM) system |
| CN102377718A (en) * | 2010-08-20 | 2012-03-14 | 联芯科技有限公司 | Automatic gain control method and device |
-
2012
- 2012-12-26 CN CN201210575215.7A patent/CN103023852B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101257472A (en) * | 2008-04-09 | 2008-09-03 | 浙江大学 | Orthogonal frequency division multiplexing receiver system and its automatic gain control method |
| CN101895507A (en) * | 2010-08-09 | 2010-11-24 | 复旦大学 | Orthogonal frequency division multiplexing receiver system and automatic gain control method thereof |
| CN102377718A (en) * | 2010-08-20 | 2012-03-14 | 联芯科技有限公司 | Automatic gain control method and device |
| CN101964774A (en) * | 2010-10-14 | 2011-02-02 | 信源通科技（西安）有限公司 | Automatic gain control method and control circuit suitable for orthogonal frequency division multiplexing (OFM) system |
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