CN103199881A - Automatic gain control method and system, and receiver - Google Patents
Automatic gain control method and system, and receiver Download PDFInfo
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Abstract
The invention relates to the technical field of communication, and discloses an automatic gain control method, an automatic gain control system and a receiver. The method comprises calculating average signal energy of former N notations of a frame of signals; presetting the value of the N; calculating a first gain control value according to the average signal energy; and conducting gain control on the first frame of signals by using the first gain control value. According to the automatic gain control method, the automatic gain control system and the receiver, instantaneity of gain control can be improved.
Description
Technical field
The present invention relates to communication technical field, be specifically related to a kind of auto gain control method, system and receiver.
Background technology
Automatic gain control (AGC, Automatic Gain Control) circuit is the circuit that often uses in a kind of signal processing, can adjust gain automatically according to the size of input signal strength, make that gain is high when receiving weak signal, and gain is low when receiving strong signal, thereby make output signal keep suitable level, being unlikely to because input signal is too little can't operate as normal, and it is too big and make receiver take place saturated or obstruction also to be unlikely to input signal.Gain instability when simultaneously it also can compensate inner operation of receiver reduces the error rate of system.
Prior art provides a kind of digital-analog mixed type feedback AGC method; in the method; its principle of carrying out feedback AGC is: the current signal of eating dishes without rice or wine is after finishing receiving; by A/D(mould/number) convert digital signal to by DSP(Digital Signal Processor; digital signal processor) carries out digital received and handle, calculate the signal energy value of eating dishes without rice or wine that this time receives.According to the energy value that DSP calculates, feed back the VGA(Variable Gain Amplifier that a controlling value is given front end, variable gain amplifier).After VGA obtains this value, the signal adjustment of eating dishes without rice or wine to receiving when time slot reception next time.For example, time slot 1 is current received frame, and after the reception of finishing this frame, DSP handles at the signal of eating dishes without rice or wine that 2 pairs of time slots 1 of time slot receive.After DSP finished processing, DSP can feed back to a gain control value to VGA according to the energy value of eating dishes without rice or wine that calculates.The gain control value that VGA receives can work at next receiving slot, and the signal of eating dishes without rice or wine of next receiving slot is adjusted in the suitable scope.The essence of such scheme is the signal energy value calculated gains controlling value according to former frame (X-1 frame) signal, and utilizes this gain control value to the control that gains of back one frame (X frame) signal.
Such scheme based on a precondition be, the signal of eating dishes without rice or wine has continuity, (about 100ms) violent variation can not occur at short notice, in the open wireless transmission course, the signal of eating dishes without rice or wine under most of situation satisfies this feature, but under many special application conditions, the continuity of signal can not effectively be satisfied (for example complex environment, high-speed mobile etc.), so its response real-time can not be guaranteed.
In sum, there is the problem of real-time deficiency in the auto gain control method of available technology adopting.
Summary of the invention
The embodiment of the invention provides a kind of auto gain control method, system and receiver, is used for improving the real-time of automatic gain control.
The embodiment of the invention provides a kind of auto gain control method, comprising:
Calculate the average signal energy of the top n symbol of a frame signal; The value of described N preestablishes;
Calculate first gain control value according to described average signal energy;
Utilize described first gain control value to the control that gains of a described frame signal.
Accordingly, the embodiment of the invention also provides a kind of AGC (automatic gain control) system, and described system comprises:
First computing unit is for the average signal energy of the top n symbol that calculates a frame signal; The value of described N preestablishes;
Second computing unit is used for calculating first gain control value according to described average signal energy;
Gain control unit is used for utilizing described first gain control value to the control that gains of a described frame signal.
Accordingly, the embodiment of the invention also provides a kind of AGC (automatic gain control) system, and described system comprises:
Signal processor is used for the average signal energy of the top n symbol of calculating one frame signal, and calculates first gain control value of a described frame signal according to described average signal energy;
Variable gain amplifier connects with described signal processor lotus root, is used for utilizing first gain control value to the control that gains of a described frame signal.
Accordingly, the embodiment of the invention also provides a kind of receiver, and described receiver comprises aforesaid AGC (automatic gain control) system.
The auto gain control method that provides in the embodiment of the invention, system and receiver, can the average signal energy of the top n symbol of a frame signal be calculated, and the gain control value of calculating this frame signal according to this average signal energy meter, thereby can realize the real-time gain control to this frame signal, gain control method compared to existing technology, improve the real-time of gain control, can be adapted to application conditions such as high-speed mobile or complex environment more.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use among the embodiment below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is flow process first schematic diagram of the auto gain control method that provides of the embodiment of the invention one;
Fig. 2 is flow process first schematic diagram of the auto gain control method that provides of the embodiment of the invention one;
Fig. 3 is the structural representation of the AGC (automatic gain control) system that provides of the embodiment of the invention two;
Fig. 4 is the structural representation of the AGC (automatic gain control) system that provides of the embodiment of the invention three;
Fig. 5 is the gain control effect exemplary plot in the embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
A kind of auto gain control method, system and receiver are provided in the embodiment of the invention, have been used for improving the real-time of gain control.Below be elaborated respectively.
Embodiment one:
The invention provides a kind of auto gain control method, as shown in Figure 1, comprising:
101, calculate the average signal energy of the top n symbol of a frame signal; The value of N preestablishes;
102, the average signal energy according to above-mentioned top n symbol calculates first gain control value;
103, utilize above-mentioned first gain control value to the control that gains of an above-mentioned frame signal.
Alternatively, before above-mentioned 101, also can comprise:
100, receive the hardware interrupts that external timer triggers.
After receiving hardware interrupts, can respond this hardware interrupts, thus execution in step 101.
In the present embodiment, the user can set the timing of external timer according to the value of N, and for example the value of N is 3 o'clock, can finish within 160ms if receive preceding 3 symbols, then the timing of external timer can be made as 160ms.
Particularly, in the present embodiment, an above-mentioned frame signal can comprise first modem section and second modem section, and first modem section is positioned at the head of an above-mentioned frame signal, and second modem section is after first modem section.
Particularly, above-mentioned 101 can specifically comprise: the average signal energy to the top n symbol of first modem section of the frame signal that receives calculates.
Particularly, above-mentioned 103 can specifically comprise: utilize above-mentioned first gain control value to the control that gains of second modem section of an above-mentioned frame signal.
Particularly, the value of N should be less than the number of the included symbol of first modem section in the frame signal, can be according to the total number of symbols of first modem section of a frame signal and the value that Hardware Response Delay speed is set N, so that before whole symbols of above-mentioned first modem section are received, finish the automatic gain of this frame signal is controlled, thereby made second modem section after first modem section obtain suitable gain control.
For instance, first modem section can be the pilot header of a frame signal, and second modem section can be effective second modem section after the pilot header.
With TETRA(Trans European Trunked Radio, pan-European trunked radio) system is example, in the TETRA frame structure, in the preceding pilot header (first modem section) that comprises of valid data symbol (second modem section), pilot header is the training sequence that comprises 6 symbols, because 3 symbols can characterize the integral energy of entire frame substantially, and through test, Hardware Response Delay speed is finished calculating and the feedback of gain control value before enough being supported in and receiving the valid data symbol, so the value of N can be set at 3; Certainly faster under the situation, also the value of N can be made as 4 or 5 in Hardware Response Delay speed.Certainly those skilled in the art also can not do concrete restriction herein according to the frame structure of signal, to different, the suitable concrete value that N is set of aspects such as the requirement of gain control precision and Hardware Response Delay speed.
Alternatively, as shown in Figure 2, before above-mentioned 101, also can comprise:
201, utilize second gain control value set to the control that gains of the top n symbol of an above-mentioned frame signal;
In the present embodiment, second gain control value can be the former frame signal gain controlling value of an above-mentioned frame signal, before the gain control value of this frame signal did not calculate, the gain control value that can use the previous frame signal was to the control that gains of the top n symbol of this frame signal (pilot header).
Accordingly, above-mentioned steps 101 specifically comprises: the average signal energy that calculates the top n symbol of the above-mentioned gain control of the process of an above-mentioned frame signal.Specifically can calculate the average signal energy of above-mentioned top n symbol in conjunction with second gain control value.
The auto gain control method that present embodiment provides can be applicable to comprise the signal system of pilot header, because the training sequence that pilot header comprises can not use in system, therefore this section training sequence can not carry out correct processing, the auto gain control method that present embodiment provides utilizes this section training sequence to carry out the measurement of signal averaging energy just, and come calculated gains according to the signal averaging energy, and use the gain that calculates to come the control that gains of a frame signal to this section training sequence place.
Setting by suitable N value; can guarantee before the valid data symbol that receives a frame signal, to finish calculating and the feedback of gain control value; thereby can adopt the up-to-date gain control value that calculates to the control that gains of follow-up valid data symbol; digital-analog mixed type feedback AGC method compared to existing technology; the response real-time is stronger, applicable to high-speed mobile or other complex environment.
Need to prove, the auto gain control method that present embodiment provides also can be used for the automatic gain control to other adequate types signal, if there are several symbols that can not use (i.e. first modem section) in the prostatitis at a frame of this signal, then can be according to the average signal energy of the average signal energy calculation of these ignore characters being determined this frame signal, thereby calculate the gain control value to this frame signal, as long as before useful symbol (i.e. second modem section) the gain control to this frame signal, finish calculating and the feedback of gain control value.
Embodiment two:
The present invention also provides a kind of AGC (automatic gain control) system, as shown in Figure 3, comprising:
In the present embodiment, this system also can comprise: receiving element is used for receiving the hardware interrupts that external timer triggers.
Receiving element is after receiving hardware interrupts, and first computing unit 301 can respond this hardware interrupts, thereby carries out the average signal energy calculation to the top n symbol of a frame signal.
In the present embodiment, the user can set the timing of external timer according to the value of N, is 3 o'clock as the value of N, can finish within 160ms if receive preceding 3 symbols, then the timing of external timer can be made as 160ms.
Particularly, in the present embodiment, an above-mentioned frame signal can comprise first modem section and second modem section, and first modem section is positioned at the head of an above-mentioned frame signal, and second modem section is after first modem section.
Particularly, first computing unit 301 can be specifically be used for calculating the average signal energy of top n symbol of first modem section of a frame signal; Gain control unit 303 can be specifically be used for utilizing above-mentioned first gain control value to the control that gains of second modem section of an above-mentioned frame signal.
Wherein the value of N can preestablish, the value of N should be less than the number of the included symbol of first modem section in the frame signal, can be according to the total number of symbols of first modem section of a frame signal and the value that Hardware Response Delay speed is set N, so that before whole symbols of above-mentioned first modem section are received, finish the control of the automatic gain of this frame signal, thereby make the control that gained normally of second modem section after first modem section.
For instance, first modem section can be the pilot header of a frame signal, and second modem section can be effective second modem section after the pilot header.
Be example with the TETRA system, in the TETRA frame structure, in the preceding pilot header (first modem section) that comprises of valid data symbol (second modem section), pilot header is the training sequence that comprises 6 symbols, because three symbols can characterize the integral energy of entire frame substantially, and through test, Hardware Response Delay speed is finished calculating and the feedback of gain control value before enough being supported in and receiving the valid data symbol, so the value of N can be set at 3; Certainly faster under the situation, also the value of N can be made as 4 or 5 in Hardware Response Delay speed.Certainly those skilled in the art also can not do concrete restriction herein according to the frame structure of signal, to different, the suitable concrete value that N is set of aspects such as the requirement of gain control precision and Hardware Response Delay speed.
Alternatively, gain control unit 303 also can be used for utilizing second gain control value set to the control that gains of the top n symbol of an above-mentioned frame signal;
In the present embodiment, second gain control value can be the former frame signal gain controlling value of an above-mentioned frame signal, before the gain control value of this frame signal did not calculate, the gain control value that can use the previous frame signal was to the control that gains of the top n symbol of this frame signal (pilot header).
Accordingly, the average signal energy of the top n symbol of the above-mentioned gains control of first computing unit, 301 concrete processes for calculating one frame signal.Specifically can calculate the average signal energy of above-mentioned top n symbol in conjunction with second gain control value.
The AGC (automatic gain control) system that present embodiment provides can be used for the gain control to the signal that comprises pilot header, because the training sequence that pilot header comprises can not use in signal system, therefore this section training sequence can not carry out correct processing, the AGC (automatic gain control) system that present embodiment provides utilizes this section training sequence to carry out the measurement of signal averaging energy just, and come calculated gains according to the signal averaging energy, and use the gain that calculates to come the control that gains of a frame signal to this section training sequence place.
Setting by suitable N value; can guarantee before the valid data symbol that receives a frame signal, to finish calculating and the feedback of gain control value; thereby can adopt the up-to-date gain control value that calculates to the control that gains of follow-up valid data symbol; digital-analog mixed type feedback AGC method compared to existing technology; the response real-time is stronger, applicable to high-speed mobile or other complex environment.
Need to prove, the AGC (automatic gain control) system that present embodiment provides also can be used for the automatic gain control to other adequate types signal, if there are several symbols that can not use (i.e. first modem section) in the prostatitis at a frame of this signal, then can be according to the average signal energy of the average signal energy calculation of these ignore characters being determined this frame signal, thereby calculate the gain control value to this frame signal, as long as before useful symbol (i.e. second modem section) the gain control to this frame signal, finish calculating and the feedback of gain control value.
Embodiment three:
The present invention also provides a kind of AGC (automatic gain control) system, and as shown in Figure 4, this AGC (automatic gain control) system can comprise:
In the present embodiment, this system also can comprise external timer, external timer be used in receiver finish the top n symbol of a frame signal received after, trigger a hardware interrupts to signal processor 401, so that these hardware interrupts of signal processor 401 response, thereby average signal energy and first gain control value of the top n symbol of a frame signal calculated.
Need to prove that the user can set the timing of external timer according to the value of N, is 3 o'clock as the value of N, can finish within 160ms if receive preceding 3 symbols, then the timing of external timer can be made as 160ms.
Particularly, in the present embodiment, an above-mentioned frame signal can comprise first modem section and second modem section, and first modem section is positioned at the head of an above-mentioned frame signal, and second modem section is after first modem section.
Particularly, in the present embodiment, signal processor 401 can be specifically be used for calculating the average signal energy of top n symbol of first modem section of a frame signal; Variable gain amplifier 402 can be specifically be used for utilizing above-mentioned first gain control value to the control that gains of second modem section of an above-mentioned frame signal.
Wherein the value of N can preestablish, the value of N should be less than the number of the included symbol of first modem section in the frame signal, can be according to the total number of symbols of first modem section of a frame signal and the value that Hardware Response Delay speed is set N, so that before whole symbols of above-mentioned first modem section are received, finish the control of the automatic gain of this frame signal, thereby make the control that gained normally of second modem section after first modem section.
For instance, first modem section can be the pilot header of a frame signal, and second modem section can be effective second modem section after the pilot header.
Be example with the TETRA system, in the TETRA frame structure, in the preceding pilot header (first modem section) that comprises of valid data symbol (second modem section), pilot header is the training sequence that comprises 6 symbols, because three symbols can characterize the integral energy of entire frame substantially, and through test, Hardware Response Delay speed is finished calculating and the feedback of gain control value before enough being supported in and receiving the valid data symbol, so the value of N can be set at 3; Certainly faster under the situation, also the value of N can be made as 4 or 5 in Hardware Response Delay speed.Certainly those skilled in the art also can not do concrete restriction herein according to the frame structure of signal, to different, the suitable concrete value that N is set of aspects such as the requirement of gain control precision and Hardware Response Delay speed.
Alternatively, variable gain amplifier 401 also can be before signal processor calculates the average signal energy of top n symbol of a frame signal, to utilizing second gain control value set to the control that gains of the top n symbol of this frame signal.
In the present embodiment, second gain control value can be the former frame signal gain controlling value of an above-mentioned frame signal, before the gain control value of this frame signal did not calculate, the gain control value that can use the previous frame signal was to the control that gains of the top n symbol of this frame signal (pilot header).
Accordingly, the average signal energy of the top n symbol of the above-mentioned gains control of signal processor 301 concrete processes for calculating one frame signal.Specifically can calculate the average signal energy of above-mentioned top n symbol in conjunction with second gain control value.
The AGC (automatic gain control) system that present embodiment provides can be used for the automatic gain control to the signal that comprises pilot header, because the training sequence that pilot header comprises can not use in signal system, therefore this section training sequence can not carry out correct processing, the auto gain control method that the AGC (automatic gain control) system that present embodiment provides adopts utilizes this section training sequence to carry out the measurement of signal averaging energy just, and come calculated gains according to the signal averaging energy, and use the gain that calculates to come the control that gains of a frame signal to this section training sequence place.
Setting by suitable N value; can guarantee before the valid data symbol that receives a frame signal, to finish calculating and the feedback of gain control value; thereby can adopt the up-to-date gain control value that calculates to the control that gains of follow-up valid data symbol; adopt the receiver of digital-analog mixed type feedback AGC method compared to existing technology; the response real-time is stronger, applicable to high-speed mobile or other complex environment.
For instance, in the present embodiment, AGC (automatic gain control) system also can comprise external timer, external timer is used in (external timer is set to the time of reception of N signal) after the reception of finishing the top n symbol, trigger a hardware interrupts to signal processor, so that signal processor responds this hardware interrupts, the top n symbol is averaged the calculating of signal energy.
Preferably, in the present embodiment, signal processor 401 can be digital signal processor DSP (Digital Signal Processing), if variable gain amplifier 402 input and output all is analog signals, then between variable gain amplifier 402 and signal processor 401, also can comprise A/D converter and D/A, to realize the conversion between analog signal and the digital signal.
For instance, signal processor can adopt following method of measurement that the average signal energy is measured:
In the communication system based on QPSK and QAM debud mode, baseband signal usually with the I of quadrature, Q signal in rectangular coordinate system, representing.And receiving on the path, by the intermediate frequency frequency conversion, convert base-band digital I, Q signal behind the down-conversion sample quantization to, again by RRC(Radio Resource Control, radio resource control) filter, low pass filter etc. filter signal and reduction, form original baseband I, Q signal arrival DSP.The I that DSP receives, Q signal are namely comprising the intensity of the signal of eating dishes without rice or wine, and can obtain estimation and the tolerance of this energy by the numerical calculation to sampled point, and the method that adopts is the summation of vector, and formula is as follows:
After according to above-mentioned formula N the sampled point that receives being carried out vector summation, obtaining average signal energy value AveragePower, is to ask at the end log to get final product the dB(decibel of picked up signal to this value with 10) value.
For instance, signal processor can adopt following mode to carry out the calculating of first gain control value:
After obtaining average signal energy value, need according to this energy value that obtains first gain control value to be calculated, the reference calculation formula is as follows:
F(V)＝RSSI–AveragePower-ANT-B
In the above-mentioned formula, F(V) be first gain control value that calculates, ANT is antenna damping, B is calibration value, and both are constant, and RSSI is outer signals field intensity value, can be estimated to obtain that related content belongs to prior art, does not repeat them here by signal processor by the top n symbol.
For instance, calculating the first gain control value F(V) afterwards, variable gain amplifier 402 can utilize F(V) to the frame signal control that gains, as shown in Figure 5:
Fig. 5 is gain control effect exemplary plot, and in this example, longitudinal axis representative is to use F(V among the figure) average energy of output signal after the control that gains, the transverse axis representative be RSSI value, RSSI value is by estimating acquisition.Since physical circuit to the optimum reception average energy of output signal about single-ended 45mVp_p, be lower than 0.6mVp_p and be higher than 0.85Vp_p scope in addition, therefore physical circuit loses the acquisition capability to signal, need utilize F(V) to the signal control that gains.As can be seen from Figure 5, when signal strength signal intensity RSSI at-80dBm in the scope of-6dBm, F(V) play a role, to the signal control that gains, output signal average energy after gain is controlled is remained on about single-ended 45mVp_p, allow physical circuit obtain the optimum reception peak value.
Need to prove, the AGC (automatic gain control) system that present embodiment provides also can be used for the automatic gain control to other adequate types signal, if there are several symbols that can not use (i.e. first modem section) in the prostatitis at a frame of this signal, then can be according to the average signal energy of the average signal energy calculation of these ignore characters being determined this frame signal, thereby calculate the gain control value to this frame signal, as long as before useful symbol (i.e. second modem section) the gain control to this frame signal, finish calculating and the feedback of gain control value.
Embodiment four:
The present invention also provides a kind of receiver, comprises the three described automatic control systems as embodiment in this receiver, please refer to embodiment three about the particular content of this automatic control system, does not repeat them here.
Need to prove, more than each embodiment all for same inventive concept, in the above-described embodiments,
Description to each embodiment all emphasizes particularly on different fields, and does not have the part of detailed description among certain embodiment, can be referring to the associated description of other embodiment.
One of ordinary skill in the art will appreciate that all or part of step in the whole bag of tricks of above-described embodiment is to instruct relevant hardware to finish by program, this program can be stored in the computer-readable recording medium, storage medium can comprise: flash disk, read-only memory (Read-Only Memory, ROM), random access device (Random Access Memory, RAM), disk or CD etc.
More than auto gain control method, system and receiver that the embodiment of the invention is provided be described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (10)
1. an auto gain control method is characterized in that, comprising:
Calculate the average signal energy of the top n symbol of a frame signal; The value of described N preestablishes;
Calculate first gain control value according to described average signal energy;
Utilize described first gain control value to the control that gains of a described frame signal.
2. method according to claim 1 is characterized in that, a described frame signal comprises first modem section and second modem section;
The average signal energy of the top n symbol of described calculating one frame signal comprises: the average signal energy that calculates the top n symbol in first modem section of a described frame signal; The sum of the symbol that the value of described N comprises less than described first modem section;
Describedly utilize described first gain control value control that gains comprises to a described frame signal: utilize described first gain control value to the control that gains of second modem section of a described frame signal.
3. method according to claim 1 and 2 is characterized in that, before the average signal energy of the top n symbol of described calculating one frame signal, described method also comprises:
Utilize second gain control value set to the control that gains of the top n symbol of a described frame signal;
The average signal energy of the top n symbol of described calculating one frame signal comprises: the average signal energy that calculates the top n symbol of the described gain control of the process of a frame signal.
4. an AGC (automatic gain control) system is characterized in that, described system comprises:
First computing unit is for the average signal energy of the top n symbol that calculates a frame signal; The value of described N preestablishes;
Second computing unit is used for calculating first gain control value according to described average signal energy;
Gain control unit is used for utilizing described first gain control value to the control that gains of a described frame signal.
5. system according to claim 4 is characterized in that, a described frame signal comprises first modem section and second modem section;
Described first computing unit specifically be used for to calculate the average signal energy of top n symbol of first modem section of a described frame signal; The sum of the symbol that the value of described N comprises less than described first modem section;
Described gain control unit specifically is used for utilizing described first gain control value to the control that gains of second modem section of a described frame signal.
6. according to claim 4 or 5 described systems, it is characterized in that described gain control unit also be used for to utilize second gain control value set to the control that gains of the top n symbol of a described frame signal;
Described first computing unit specifically be used for to calculate the average signal energy of top n symbol of the described gain control of process of a frame signal.
7. an AGC (automatic gain control) system is characterized in that, described system comprises:
Signal processor is used for the average signal energy of the top n symbol of calculating one frame signal, and calculates first gain control value of a described frame signal according to described average signal energy;
Variable gain amplifier connects with described signal processor lotus root, is used for utilizing first gain control value to the control that gains of a described frame signal.
8. system according to claim 7 is characterized in that, a described frame signal comprises first modem section and second modem section;
Described signal processor specifically be used for to calculate the average signal energy of top n symbol of first modem section of a described frame signal; The sum of the symbol that the value of described N comprises less than described pilot header;
Described variable gain amplifier specifically is used for utilizing first gain control value to the control that gains of second modem section of a described frame signal.
9. according to claim 7 or 8 described systems, it is characterized in that, described variable gain amplifier also was used for before described signal processor calculates the average signal energy of top n symbol of a described frame signal, used second gain control value set to the control that gains of the top n symbol of a described frame signal;
Described signal processor specifically be used for to calculate the average signal energy of top n symbol of the described gain control of process of a described frame signal.
10. a receiver is characterized in that, described receiver comprises each described AGC (automatic gain control) system as claim 7-9.
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| WO2017173916A1 (en) * | 2016-04-05 | 2017-10-12 | 中兴通讯股份有限公司 | Beam training phase automatic gain control method and apparatus |
| CN108768425A (en) * | 2018-07-02 | 2018-11-06 | 成都国恒空间技术工程有限公司 | A kind of dynamic adjusting method of automatic growth control AGC |
| CN112995082A (en) * | 2019-12-17 | 2021-06-18 | 辰芯科技有限公司 | OFDM symbol processing method, device, equipment and storage medium |
| CN113366865A (en) * | 2019-02-13 | 2021-09-07 | 杜比实验室特许公司 | Adaptive loudness normalization for audio object clustering |
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