CN103023852A - 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 the wireless communication technique field, be specifically related to a kind of implementation method and software flow that is applicable to the automatic gain control (AGC) of ofdm system wireless receiver.
Background technology
In the wireless telecommunication system, the radiofrequency signal that transmitter produces is transferred to receiver through wireless channel, because path attenuation and shade impact, signal will inevitably change in a very large scope, for the reception signal amplitude that enters into digital to analog converter is controlled in the metastable scope, gain amplifier that need to be different to the varying strength signal setting both had been unlikely to saturated when guaranteeing to enter the signal of digital to analog converter and also had been unlikely to too little.
Gain Automatic control AGC mainly is divided into two large classes, and a class is simulation AGC, and another kind of is digital AGC.Simulation AGC is radio-frequency head receives signal by the analog circuit detection amplitude, automatically generates corresponding feedback adjusting voltage according to the amplitude that detects, and then adjusts the variable gain control voltage of radio frequency reception amplifier, makes the reception signal amplitude satisfy the demodulation requirement.Digital AGC is that baseband signal processing module detects the digital signal amplitude that receives, calculate corresponding required VGA yield value by digital algorithm, variable gain control voltage according to yield value control radio frequency reception amplifier makes the reception signal amplitude satisfy the demodulation requirement.Because digital AGC hardware is realized simple, regulate the speed fast, portable strong, obtain more and more wider application.
The OFDM orthogonal frequency division multiplexi is that whole transmission broadband is divided into a series of mutually orthogonal subcarriers, need only the shared bandwidth of single sub-carrier enough narrow, it is smooth that channel frequency response on it can be considered, and whereby frequency selective fading channels is converted into the sub-carrier channels of a series of flat fadings.Before each time domain OFDM symbol is sent to transmission, add the extended cyclic prefix greater than the channel maximum delay, can eliminate in the radio communication because the serious intersymbol interference that the channel multi-path decline causes.Ofdm system obtains more and more extensive use in recent years, has all adopted this technology such as Wimax and LTE.Yet since the OFDM receiver performance affected by the signal amplitude size larger, therefore need in receiver, carry out automatic gain control, will receive signal amplitude and automatically adjust in the OK range.
Summary of the invention
Technical problem: in order to address the above problem, the invention provides a kind of automatic control that can in wider received power scope, realize rapid abutting joint collection of letters gain amplifier, ageing good, overcome the impact that burr signal brings, reduced the fast digital auto gain control method that is used for OFDM receiver of the synchronous unnecessary expense of received frame.
Technical scheme: the fast digital auto gain control method for OFDM receiver of the present invention comprises signals collecting step, signal detection step and the gain control step of running simultaneously.
1) in the described signals collecting step, constantly repeat following flow process:
11) after system enables, the received signal strength indicator digital signal after the analog to digital converter conversion is gathered;
12) get the fixed sample M that counts, described received signal strength indicator digital signal is averaged, obtain mean value signal and submit to signal detection step;
2) in the described signal detection step, after getting access to mean value signal base band OFDM symbol frame is detected, when detecting step is judged the frame head of the corresponding OFDM symbol of this mean value signal and postamble, this average is submitted to gain control step, and when judging corresponding OFDM symbol, burr or carrier wave, do not submit to, idiographic flow is:
21) obtain mean value signal, remove the controllable gain amplifier gain end mark is set, whether judge mean value signal greater than the lowest signal threshold value, in this way, then enter step 22a behind N time of delay), otherwise enter step 23a);
22a) judge that mean value signal whether greater than the lowest signal threshold value, in this way, then enters step 22b), otherwise get back to step 21);
22b) judging that controllable gain amplifier gain arranges indicates whether set, in this way, then gets back to step 21), otherwise enter step 22c);
22c) judge whether the LNA gear changes, in this way, then upgrade and get back to 22a after the LNA gear records), otherwise mean value signal is submitted to gain control step;
23a) judging that controllable gain amplifier gain arranges indicates whether set, in this way, then enters step 23b behind N time of delay), otherwise get back to 21);
23b) judge that mean value signal whether greater than the lowest signal threshold value, in this way, then gets back to step 21), otherwise the gain of set controllable gain amplifier is submitted to gain control step with mean value signal after end mark is set;
3) gain control step arranges LNA gear and controllable gain amplifier and gains to control gain of received signal according to the mean value signal of signal detection step submission, and idiographic flow is:
31) obtain the mean value signal that receives, remove the controllable gain amplifier gain sign is set;
32) judge that LNA gear sign whether for high tap position, in this way, then enters step 33a), otherwise enter 34a);
33a) judge whether mean value signal satisfies V 〉=V
Hmax, wherein V represents mean value signal, V
HmaxRepresent the corresponding receiving signal intensity indication signal of high tap position maximal input, in this way, then LNA reduced a gear, get back to step 31 after LNA gear sign is set), otherwise enter 33b);
33b) judge whether mean value signal satisfies V
Hmin≤ V≤V
Hmax, wherein V represents mean value signal, V
HminReceiving signal intensity indication signal corresponding to the most high-grade minimum power input of expression, V
HmaxRepresent receiving signal intensity indication signal corresponding to high tap position maximal input, in this way, then the LNA gear is set to 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, enter step 37 after setting the controllable gain amplifier yield value), otherwise the LNA gear is set to enter step 33c behind the high tap position);
33c) judge that controllable gain amplifier gain arranges whether set of end mark, in this way, then gets back to step 31), otherwise enter step 37 after the controllable gain amplifier yield value is made as maxgain value);
34) judge whether LNA gear sign is lowest gear, if then enter step 35a), otherwise enter step 36a);
35a) judge whether mean value signal satisfies V≤V
Lmin, wherein V represents mean value signal, V
LminReceiving signal intensity indication signal magnitude of voltage corresponding to expression lowest gear minimum power input, if, then LNA is increased a gear, the gear sign is set, get back to step 31), otherwise enter step 35b);
35b) judge whether mean value signal satisfies V
Lmin≤ V≤V
Lmax, wherein V represents mean value signal, V
LminReceiving signal intensity indication signal corresponding to expression lowest gear minimum power input, V
LmaxReceiving signal intensity indication signal corresponding to expression lowest gear maximal input, if then the LNA gear is set to lowest gear, and by entering step 37 behind the setting controllable gain amplifier yield value of tabling look-up), otherwise enter 35c);
35c) judge that controllable gain amplifier gain arranges whether set of end mark, in this way, then the LNA gear be made as high tap position, get back to step 31), otherwise enter step 37 after the controllable gain amplifier yield value is made as maxgain value)
36a) judge whether mean value signal satisfies V
Mmin≤ V≤V
Mmax, wherein V represents mean value signal, V
MminExpression LNA gear sign represents the corresponding receiving signal intensity indication signal of minimum power input of gear, V
MmaxExpression LNA gear sign represents the corresponding receiving signal intensity indication signal of maximal input of gear, if then the LNA gear is set to the gear sign and represents gear, the controllable gain amplifier gain is set by tabling look-up, enter step 37), otherwise enter step 36b);
36b) judge whether mean value signal satisfies V 〉=V
Mmax, wherein V represents mean value signal, V
MmaxExpression LNA gear sign represents the corresponding receiving signal intensity indication signal of maximal input of gear, if, then the LNA gear is reduced a gear, get back to step 31 after the gear sign is set), otherwise enter 36c);
36c) judge that controllable gain amplifier gain arranges whether set of end mark, in this way, then the LNA gear is made as high tap position, the gear sign is set, get back to step 31), otherwise the LNA gear is increased a gear, get back to step 31 after the gear sign is set);
37) gain of set controllable gain amplifier arranges the rear finishing control flow process of sign.
2. in the described signal detection step, mean value signal still arranges greater than lowest signal threshold value and controllable gain amplifier gain after greater than lowest signal threshold value time-delay N and indicates that the not set reception signal that then this mean value signal is corresponding is the OFDM symbol frame head, and little the setting with lowest signal threshold value controllable gain amplifier of mean value signal indicates and delay time set mean value signal is the OFDM symbol postamble less than the lowest signal threshold value reception signal that then this mean value signal is corresponding still behind the N;
Among the present invention, the method to set up of lowest signal threshold value is: measure the minimum value that receiver can be identified input signal strength index signal corresponding to minimum power input signal OFDM symbol, this value is the minimum signal threshold value;
Time of delay, the setting of N met the following conditions: measure the corresponding input signal strength index signal time of duration, OFDM symbol frame head corresponding input signal strength index signal time of rising edge, OFDM symbol postamble trailing edge of receiving signal intensity indication signal corresponding to burr, time of delay, N must be greater than above-mentioned three maximums that record the time.
In the step 3) of the present invention, receiving signal intensity indication signal and input signal strength relation table are by inquiry chip data handbook or measure acquisition;
Described controllable gain amplifier yield value and input signal strength relation table make by the following method:
According to the requirement of receiver system optimum Working, set and adjust OFDM symbol amplitude desired value, fixing LNA gear, change the controllable gain amplifier gain, so that the OFDM symbol amplitude reaches desired value after adjusting, record successively yield value in the corresponding input signal power scope of each LNA gear value, relation table made in record.
In the step 3) of the present invention, when the LNA gear was in high tap position, the LNA gain amplifier was maximum, and when being in lowest gear, the LNA gain amplifier is minimum.
Beneficial effect: the present invention compared with prior art has the following advantages:
The inventive method can realize in wider received power scope the automatic control of rapid abutting joint collection of letters gain amplifier, keeps basicly stable so that receive signal amplitude after the control processing of process present technique system, and the assurance subsequent treatment can normally be carried out.
The inventive method ageing good, overcome the impact that burr signal brings, reduced the OFDM received frame synchronous unnecessary expense that the carrier signal fluctuation causes.
The inventive method is confirmed as the sampled point of signal for collection when collection signal, again sampling judgement after delaying time can be eliminated the OFDM semi-duplex communication system because the impact of the burr signal on the RSSI signal that Transmit enable causes.
In the inventive method, by again the average of RSSI being submitted to VGA control step after the shorter time-delay, can reduce the fluctuation of OFDM time-domain signal so that VGA control is more accurate, reduce the difficulty of OFDM received frame synchronization module Threshold.
In the inventive method, by M order average, than short time delay N, table lookup operation has avoided loaded down with trivial details accurate Calculation to guarantee the rapidity that algorithm is implemented, the VGA control procedure can be accomplished in the Cyclic Prefix of OFDM, first OFDM symbol of OFDM symbolic frame can correctly receive, and does not increase the expense of ofdm system.
Description of drawings
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 done further specifying.
Fast digital auto gain control method for OFDM receiver of the present invention comprises signals collecting, input and three steps of gain control:
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, and mean value signal is submitted to signal detection step;
Signal detection step detects the baseband OFDM symbolic frame after getting access to mean value signal, when detecting step is judged the corresponding OFDM symbol frame head of this mean value signal and postamble, then this mean value signal is submitted to gain control step, and when being judged to be OFDM symbol, burr or carrier wave, do not submitted to;
The average voltage that gain control step is submitted to according to signal detection step arranges suitable LNA gear and VGA and gains to control gain of received signal.
As a preferred embodiment of the present invention, signals collecting in the 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 embodiment of description of drawings, this embodiment makes following setting according to self system's characteristic:
It is 32 points that number of sampling M is set;
It is 3.8us that time-delay N is set;
It is RSSI voltage that the input signal strength index signal is set;
It is the MAX shelves that the high tap position of LNA is set, and the maximum input intensity of MAX shelves is-60dBm that minimum input intensity is-80dBm;
It is the MAX-16 shelves that LNA deep low gear gear is set, and the maximum input intensity of MAX-16 shelves is-27dBm that maximum input intensity is-65dBm;
The LNA gear is set only gets 2 grades and MAX shelves, MAX-16 shelves, cancelled middle gear; Therefore, whether in idiographic flow, judge LNA gear sign for the most high-grade, as otherwise must be deep low gear, whether be the judgement of lowest gear and middle gear so omitted the gear sign, and all follow-up process steps of middle gear.
It is 2 ' h0d that controllable gain amplifier yield value VGA maximum gain is set, and least gain is 2 ' h1f;
Signals collecting in the auto gain control method, input and gain control flow are as follows:
Signals collecting:
System's enable signal acquisition step, this step is started working, and does after the RSSI signals collecting at 32 and on average this mean value signal is submitted to signal detection step, constantly repeats this process, until this step is by system closure;
Input:
A. get RSSI mean value, remove VGA end mark is set;
B. judge whether mean value signal surpasses 400mV, surpass and assert that then receiving signal carries out following step c, do not receive signal above then assert, carry out following step f;
C. the 3.8us that delays time overcomes the impact of RSSI signal burr, until RSSI is stable;
D. according to new RSSI average, judge whether to surpass 400mV.If surpass, judge first that then VGA arranges whether set of flag bit, if following step e is not carried out in set, otherwise repeat above-mentioned steps b;
E. continue to judge whether LNA gear sign changes, do not change and then immediately the RSSI average is submitted to gain control step, otherwise upgrade LNA gear record, according to new RSSI average repeating step d;
The f.RSSI average is lower than 400mV, judges that VGA arranges flag bit, if arrange, and repeating step a then.If arrange, time-delay 3.8us guarantees to detect the OFDM symbolic frame and finishes, and carries out following step g;
G. judge whether mean value signal surpasses 400mV, if then carry out step a, otherwise set VGA end mark is submitted to gain control step with the RSSI average.
Gain control:
Gain control process:
1. get the RSSI average of submission, remove VGA sign is set, carry out following step 2.;
2. judge that 3. whether LNA gear sign is the MAX shelves, if it is carry out following step, otherwise carry out following step 6.;
3. judging that the RSSI average whether greater than the corresponding RSSI magnitude of voltage of MAX shelves-60dBm, is then to carry out following step 4., is the MAX shelves otherwise the LNA gear is set, and upgrades LNA gear sign, repeats above-mentioned steps 1.;
4. judge the RSSI average whether be in MAX shelves-80～-RSSI voltage range interval corresponding to 60dBm in, be the MAX shelves if gear then is set, set VGA value by tabling look-up, set VGA arranges sign, renewal LNA gear sign; Otherwise carry out step 5.;
5. gear is set is the MAX shelves, judges that VGA arranges whether set of end mark, if then carry out above-mentioned steps 1.; Be 2 ' h0d otherwise the VGA value is set, set VGA arranges sign;
6. whether judge the RSSI average less than MAX-16 shelves-65dBmSSI magnitude of voltage, it is the MAX shelves that gear then is set in this way, upgrades LNA gear sign, gets back to step 1., otherwise carries out following step 7.;
7. judge the RSSI average whether be in MAX-16 shelves-65～-RSSI voltage range interval corresponding to 27dBm in, be the MAX-16 shelves if gear then is set, upgrade LNA gear sign, set the VGA value by tabling look-up, set VGA arranges sign; Otherwise carry out following step 8.;
8. judge that VGA arranges whether set of end mark, being the MAX shelves if the LNA gear then is set, upgrading the gear sign and get back to step 1., is the MAX-16 shelves otherwise the LNA gear is set, upgrade LNA gear sign, it is 2 ' h1f that the controllable gain amplifier gain is set again.
Design and the look-up method of table:
Set the VGA value by tabling look-up in the above-mentioned gain control process, concrete operations are as follows:
Because under certain LNA gear, RSSI can indicate input signal strength linearly, signal strength signal intensity is corresponding one by one with the VGA gain, 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 seen Fig. 3,4,5,6.
Claims (5)
1. fast digital auto gain control method that is used for OFDM receiver, the method comprises signals collecting step, signal detection step and the gain control step of running simultaneously, and it is characterized in that:
1) in the described signals collecting step, constantly repeat following flow process:
11) after system enables, the received signal strength indicator digital signal after the analog to digital converter conversion is gathered;
12) get the fixed sample M that counts, described received signal strength indicator digital signal is averaged, obtain mean value signal and submit to signal detection step;
2) in the described signal detection step, after getting access to mean value signal base band OFDM symbol frame is detected, when detecting step is judged the frame head of the corresponding OFDM symbol of this mean value signal and postamble, this average is submitted to gain control step, and when judging corresponding OFDM symbol, burr or carrier wave, do not submit to, idiographic flow is:
21) obtain mean value signal, remove the controllable gain amplifier gain end mark is set, whether judge mean value signal greater than the lowest signal threshold value, in this way, then enter step 22a behind N time of delay), otherwise enter step 23a);
22a) judge that mean value signal whether greater than the lowest signal threshold value, in this way, then enters step 22b), otherwise get back to step 21);
22b) judging that controllable gain amplifier gain arranges indicates whether set, in this way, then gets back to step 21), otherwise enter step 22c);
22c) judge whether the LNA gear changes, in this way, then upgrade and get back to 22a after the LNA gear records), otherwise mean value signal is submitted to gain control step;
23a) judging that controllable gain amplifier gain arranges indicates whether set, in this way, then enters step 23b behind N time of delay), otherwise get back to 21);
23b) judge that mean value signal whether greater than the lowest signal threshold value, in this way, then gets back to step 21), otherwise the gain of set controllable gain amplifier is submitted to gain control step with mean value signal after end mark is set;
3) gain control step arranges LNA gear and controllable gain amplifier and gains to control gain of received signal according to the mean value signal of signal detection step submission, and idiographic flow is:
31) obtain the mean value signal that receives, remove the controllable gain amplifier gain sign is set;
32) judge that LNA gear sign whether for high tap position, in this way, then enters step 33a), otherwise enter 34);
33a) judge whether mean value signal satisfies V 〉=V
Hmax, wherein V represents mean value signal, V
HmaxRepresent the corresponding receiving signal intensity indication signal of high tap position maximal input, in this way, then LNA reduced a gear, get back to step 31 after LNA gear sign is set), otherwise enter 33b);
33b) judge whether mean value signal satisfies V
Hmin≤ V≤V
Hmax, wherein V represents mean value signal, V
HminReceiving signal intensity indication signal corresponding to the most high-grade minimum power input of expression, V
HmaxRepresent receiving signal intensity indication signal corresponding to high tap position maximal input, in this way, then the LNA gear is set to 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, enter step 37 after setting the controllable gain amplifier yield value), otherwise the LNA gear is set to enter step 33c behind the high tap position);
33c) judge that controllable gain amplifier gain arranges whether set of end mark, in this way, then gets back to step 31), otherwise enter step 37 after the controllable gain amplifier yield value is made as maxgain value);
34) judge whether LNA gear sign is lowest gear, if then enter step 35a), otherwise enter step 36a);
35a) judge whether mean value signal satisfies V≤V
Lmin, wherein V represents mean value signal, V
LminReceiving signal intensity indication signal magnitude of voltage corresponding to expression lowest gear minimum power input, if, then LNA is increased a gear, the gear sign is set, get back to step 31), otherwise enter step 35b);
35b) judge whether mean value signal satisfies V
Lmin≤ V≤V
Lmax, wherein V represents mean value signal, V
LminReceiving signal intensity indication signal corresponding to expression lowest gear minimum power input, V
LmaxReceiving signal intensity indication signal corresponding to expression lowest gear maximal input, if then the LNA gear is set to lowest gear, and by entering step 37 behind the setting controllable gain amplifier yield value of tabling look-up), otherwise enter 35c);
35c) judge that controllable gain amplifier gain arranges whether set of end mark, in this way, then the LNA gear be made as high tap position, get back to step 31), otherwise enter step 37 after the controllable gain amplifier yield value is made as maxgain value);
36a) judge whether mean value signal satisfies V
Mmin≤ V≤V
Mmax, wherein V represents mean value signal, V
MminExpression LNA gear sign represents the corresponding receiving signal intensity indication signal of minimum power input of gear, V
MmaxExpression LNA gear sign represents the corresponding receiving signal intensity indication signal of maximal input of gear, if then the LNA gear is set to the gear that the gear sign represents, the controllable gain amplifier gain is set by tabling look-up, enter step 37), otherwise enter step 36b);
36b) judge whether mean value signal satisfies V 〉=V
Mmax, wherein V represents mean value signal, V
MmaxExpression LNA gear sign represents the corresponding receiving signal intensity indication signal of maximal input of gear, if, then the LNA gear is reduced a gear, get back to step 31 after the gear sign is set), otherwise enter 36c);
36c) judge that controllable gain amplifier gain arranges whether set of end mark, in this way, then the LNA gear is made as high tap position, the gear sign is set, get back to step 31), otherwise the LNA gear is increased a gear, get back to step 31 after the gear sign is set);
37) gain of set controllable gain amplifier arranges the rear finishing control flow process of sign.
2. the fast digital auto gain control method for OFDM receiver according to claim 1, it is characterized in that, in the described signal detection step, if mean value signal is greater than the lowest signal threshold value, mean value signal is still greater than the lowest signal threshold value behind the time of delay N, and the controllable gain amplifier gain arranges and indicates not set, judges that then reception signal corresponding to this mean value signal is the OFDM symbol frame head;
If mean value signal is less than the lowest signal threshold value, controllable gain amplifier setting indicates set, and mean value signal judges then that still less than the lowest signal threshold value reception signal corresponding to this mean value signal is the OFDM symbol postamble behind the time of delay N.
3. the fast digital auto 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: measure the minimum value that receiver can be identified input signal strength index signal corresponding to minimum power input signal OFDM symbol, this value is the minimum signal threshold value;
Described time of delay, the setting of N met the following conditions: measure duration, OFDM symbol frame head corresponding input signal strength index signal time of rising edge, the OFDM symbol postamble trailing edge correspondence input signal strength index signal time of the corresponding input signal strength index signal of burr, time of delay, N must be greater than above-mentioned three maximums that record the time.
4. the fast digital auto 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 are by inquiry chip data handbook or measure acquisition;
Described controllable gain amplifier yield value and input signal strength relation table make by the following method:
According to the requirement of receiver system optimum Working, set and adjust OFDM symbol amplitude desired value, fixing LNA gear, change the controllable gain amplifier gain, so that the OFDM symbol amplitude reaches desired value after adjusting, record successively yield value in the corresponding input signal power scope of each LNA gear value, relation table made in record.
5. the fast digital auto gain control method for OFDM receiver according to claim 1 is characterized in that described step 3) in, when the LNA gear is in high tap position, the LNA gain amplifier is maximum, and when being in lowest gear, the LNA gain amplifier is minimum.
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| 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 |
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| CN113163427A (en) * | 2021-05-17 | 2021-07-23 | 深圳市友华通信技术有限公司 | Method for adjusting anti-interference parameters of wireless local area network |
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| 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 |
| CN107645283A (en) * | 2016-07-19 | 2018-01-30 | 炬芯（珠海）科技有限公司 | A kind of auto gain control method and device |
| CN107645283B (en) * | 2016-07-19 | 2021-06-01 | 炬芯科技股份有限公司 | Automatic gain control method and device |
| CN108155913A (en) * | 2018-01-12 | 2018-06-12 | 福建飞通通讯科技股份有限公司 | FM signal squelch method, apparatus and system |
| CN112235227A (en) * | 2020-10-16 | 2021-01-15 | 紫光展锐(重庆)科技有限公司 | Method, device and equipment for determining receiving gain and storage medium |
| CN113163427A (en) * | 2021-05-17 | 2021-07-23 | 深圳市友华通信技术有限公司 | Method for adjusting anti-interference parameters of wireless local area network |
| 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 |
| CN116634537A (en) * | 2023-06-01 | 2023-08-22 | 北京联盛德微电子有限责任公司 | Automatic power control method and system of WIFI receiver |
| 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 |
| CN117081687A (en) * | 2023-10-10 | 2023-11-17 | 四川思凌科微电子有限公司 | RSSI data sampling method |
| CN117081687B (en) * | 2023-10-10 | 2023-12-15 | 四川思凌科微电子有限公司 | RSSI data sampling method |
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| CN103023852B (en) | 2015-02-18 |
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