CN103199881B - Auto gain control method, system and receiver - Google Patents
Auto gain control method, system and receiver Download PDFInfo
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- CN103199881B CN103199881B CN201310125230.6A CN201310125230A CN103199881B CN 103199881 B CN103199881 B CN 103199881B CN 201310125230 A CN201310125230 A CN 201310125230A CN 103199881 B CN103199881 B CN 103199881B
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Abstract
The embodiment of the present invention relates to communication technical field, discloses a kind of auto gain control method, system and receiver.Wherein, the method comprises: the averaged signal energy calculating the top n symbol of a frame signal; The value of described N presets; The first gain control value is calculated according to described averaged signal energy; Described first gain control value is utilized to carry out gain control to a described frame signal.Implement the embodiment of the present invention, the real-time that gain controls 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 growth control (AGC, Automatic Gain Control) circuit is the circuit often used in a kind of signal processing, automatically gain can be adjusted according to the size of input signal strength, make the gain when receiving weak signal high, and gain is low when receiving strong signal, thus the level making output signal keep suitable, be unlikely to because input signal is too little and cannot normally work, being also unlikely to input signal and making too greatly receiver that saturated or blocking occurs.It also can compensate gain instability when internal receipt machine works simultaneously, 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: 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) carry out digital received process, 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 a controlling value to the VGA(Variable Gain Amplifier of front end, variable gain amplifier).After VGA obtains this value, when upper once time slot receives to the signal adjustment of eating dishes without rice or wine received.Such as, time slot 1 is current received frame, and after the reception completing this frame, the signal of eating dishes without rice or wine that DSP receives at time slot 2 pairs of time slots 1 processes.After DSP completes process, DSP can feed back to a gain control value to VGA according to the energy value of eating dishes without rice or wine calculated.The gain control value that VGA receives can work at next receiving slot, is adjusted in suitable scope by the signal of eating dishes without rice or wine of next receiving slot.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 carry out gain control to a rear frame (X frame) signal.
Such scheme based on a precondition be, signal of eating dishes without rice or wine has continuity, (about 100ms) there will not be violent change at short notice, in open wireless transmitting procedure, signal of eating dishes without rice or wine in most cases meets this feature, but under many special application conditions, the continuity of signal can not effectively be met (such as complex environment, high-speed mobile etc.), therefore its response real-time can not be guaranteed.
In sum, there is the problem of real-time deficiency in the auto gain control method adopted in prior art.
Summary of the invention
Embodiments provide a kind of auto gain control method, system and receiver, for improving the real-time of automatic growth control.
The embodiment of the present invention provides a kind of auto gain control method, comprising:
Calculate the averaged signal energy of the top n symbol of a frame signal; The value of described N presets;
The first gain control value is calculated according to described averaged signal energy;
Described first gain control value is utilized to carry out gain control to a described frame signal.
Accordingly, the embodiment of the present invention also provides a kind of AGC (automatic gain control) system, and described system comprises:
First computing unit, for calculating the averaged signal energy of the top n symbol of a frame signal; The value of described N presets;
Second computing unit, for calculating the first gain control value according to described averaged signal energy;
Gain control unit, carries out gain control for utilizing described first gain control value to a described frame signal.
Accordingly, the embodiment of the present invention also provides a kind of AGC (automatic gain control) system, and described system comprises:
Signal processor, for calculating the averaged signal energy of the top n symbol of a frame signal, and calculates the first gain control value of a described frame signal according to described averaged signal energy;
Variable gain amplifier, connects with described signal processor lotus root, carries out gain control for utilizing the first gain control value to a described frame signal.
Accordingly, the embodiment of the present invention also provides a kind of receiver, and described receiver comprises AGC (automatic gain control) system as above.
The auto gain control method provided in the embodiment of the present invention, system and receiver, can calculate the averaged signal energy of the top n symbol of a frame signal, and the gain control value of this frame signal is calculated according to this averaged signal energy, thus can realize controlling the real-time gain of this frame signal, gain control method compared to existing technology, improve the real-time that gain controls, can more be adapted to the application conditions such as high-speed mobile or complex environment.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is flow process first schematic diagram of the auto gain control method that the embodiment of the present invention one provides;
Fig. 2 is flow process first schematic diagram of the auto gain control method that the embodiment of the present invention one provides;
Fig. 3 is the structural representation of the AGC (automatic gain control) system that the embodiment of the present invention two provides;
Fig. 4 is the structural representation of the AGC (automatic gain control) system that the embodiment of the present invention three provides;
Fig. 5 is the gain control effects exemplary plot in the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
A kind of auto gain control method, system and receiver is provided, for improving the real-time that gain controls in the embodiment of the present invention.Below be described in detail respectively.
Embodiment one:
The invention provides a kind of auto gain control method, as shown in Figure 1, comprising:
101, the averaged signal energy of the top n symbol of a frame signal is calculated; The value of N presets;
102, the first gain control value is calculated according to the averaged signal energy of above-mentioned top n symbol;
103, above-mentioned first gain control value is utilized to carry out gain control to an above-mentioned frame signal.
Alternatively, also can comprise before above-mentioned 101:
100, the hardware interrupts that external timer triggers is received.
After reception hardware interrupts, can respond this hardware interrupts, thus perform step 101.
In the present embodiment, user can set the timing of external timer according to the value of N, such as, when the value of N is 3, can completes, then the timing of external timer can be set to 160ms if receive front 3 symbols within 160ms.
Particularly, in the present embodiment, an above-mentioned frame signal can comprise the first modem section and the second modem section, and the first modem section is positioned at the head of an above-mentioned frame signal, and the second modem section is after the first modem section.
Particularly, above-mentioned 101 can specifically comprise: calculate the averaged signal energy of the top n symbol of the first modem section of the frame signal received.
Particularly, above-mentioned 103 can specifically comprise: utilize second modem section of above-mentioned first gain control value to an above-mentioned frame signal to carry out gain control.
Particularly, the value of N should be less than the number of the symbol in a frame signal included by the first modem section, the value of N can be set according to the total number of symbols of the first modem section of a frame signal and Hardware Response Delay speed, to make the automatic growth control completed before whole symbols of above-mentioned first modem section are received this frame signal, thus the second modem section after the first modem section is made to obtain suitable gain control.
For example, the first modem section can be the pilot header of a frame signal, the second modem section can be pilot header after effective second modem section.
With TETRA(Trans European Trunked Radio, pan-European trunked radio) system is example, in TETRA frame structure, comprise pilot header (the first modem section) valid data symbol (the second modem section) is front, pilot header is the training sequence comprising 6 symbols, because 3 symbols can characterize the integral energy of whole frame substantially, and through test, Hardware Response Delay speed completes calculating and the feedback of gain control value before being enough supported in and receiving valid data symbol, therefore the value of N can be set as 3; Certainly, when Hardware Response Delay speed, also the value of N can be set to 4 or 5.Certain those skilled in the art also can according to the frame structure of signal, difference to the aspect such as requirement and Hardware Response Delay speed of gain control accuracy, and the suitable concrete value arranging N, is not specifically limited herein.
Alternatively, as shown in Figure 2, before above-mentioned 101, also can comprise:
201, the top n symbol of the second gain control value to an above-mentioned frame signal set is utilized to carry out gain control;
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 does not calculate, the top n symbol of the gain control value of previous frame signal to this frame signal (pilot header) can be used to carry out gain control.
Accordingly, above-mentioned steps 101 specifically comprises: the averaged signal energy calculating the top n symbol controlled through above-mentioned gain of an above-mentioned frame signal.The averaged signal energy of above-mentioned top n symbol specifically can be calculated in conjunction with the second gain control value.
The auto gain control method that the present embodiment provides can be applicable to the signal system comprising pilot header, the training sequence comprised due to pilot header can not use in systems in which, therefore this section of training sequence can not carry out correct process, the auto gain control method that the present embodiment provides utilizes this section of training sequence to carry out the measurement of signal averaging energy just, and carry out calculated gains according to signal averaging energy, and the frame signal of gain to this section of training sequence place calculated is used to carry out gain control.
By the setting of suitable N value; before the valid data symbol of reception one frame signal, complete gain control value calculating and feedback can be guaranteed; thus the up-to-date gain control value calculated can be adopted to carry out gain control to follow-up valid data symbol; digital-analog mixed type feedback AGC method compared to existing technology; response real-time is stronger, is applicable to high-speed mobile or other complex environment.
It should be noted that, the auto gain control method that the present embodiment provides also can be used for the automatic growth control to other suitable type signal, if there is the symbol (i.e. the first modem section) that several can not carry out using in the prostatitis of a frame of this signal, the averaged signal energy of this frame signal then can be determined according to the calculating of the averaged signal energy to these ignore characters, thus the gain control value calculated this frame signal, as long as completed the calculating of gain control value and feed back before useful symbol (i.e. the second modem section) gain to this frame signal control.
Embodiment two:
The present invention also provides a kind of AGC (automatic gain control) system, as shown in Figure 3, comprising:
First computing unit 301, for calculating the averaged signal energy of the top n symbol of a frame signal; The value of above-mentioned N presets;
Second computing unit 302, for calculating the first gain control value according to above-mentioned averaged signal energy;
Gain control unit 303, carries out gain control for utilizing above-mentioned first gain control value to an above-mentioned frame signal.
In the present embodiment, this system also can comprise: receiving element, for receiving the hardware interrupts that external timer triggers.
Receiving element is after reception hardware interrupts, and the first computing unit 301 can respond this hardware interrupts, thus performs the calculating to the averaged signal energy of the top n symbol of a frame signal.
In the present embodiment, user can set the timing of external timer according to the value of N, when the value as N is 3, can completes, then the timing of external timer can be set to 160ms if receive front 3 symbols within 160ms.
Particularly, in the present embodiment, an above-mentioned frame signal can comprise the first modem section and the second modem section, and the first modem section is positioned at the head of an above-mentioned frame signal, and the second modem section is after the first modem section.
Particularly, the first computing unit 301 can specifically for calculating the averaged signal energy of the top n symbol of the first modem section of a frame signal; Gain control unit 303 can carry out gain control specifically for utilizing second modem section of above-mentioned first gain control value to an above-mentioned frame signal.
Wherein the value of N can preset, the value of N should be less than the number of the symbol in a frame signal included by the first modem section, the value of N can be set according to the total number of symbols of the first modem section of a frame signal and Hardware Response Delay speed, to make the automatic growth control completed before whole symbols of above-mentioned first modem section are received this frame signal, thus the second modem section after the first modem section is made to obtain normal gain control.
For example, the first modem section can be the pilot header of a frame signal, the second modem section can be pilot header after effective second modem section.
For TETRA system, in TETRA frame structure, comprise pilot header (the first modem section) valid data symbol (the second modem section) is front, pilot header is the training sequence comprising 6 symbols, because three symbols can characterize the integral energy of whole frame substantially, and through test, Hardware Response Delay speed completes calculating and the feedback of gain control value before being enough supported in and receiving valid data symbol, therefore the value of N can be set as 3; Certainly, when Hardware Response Delay speed, also the value of N can be set to 4 or 5.Certain those skilled in the art also can according to the frame structure of signal, difference to the aspect such as requirement and Hardware Response Delay speed of gain control accuracy, and the suitable concrete value arranging N, is not specifically limited herein.
Alternatively, gain control unit 303 also can be used for utilizing the top n symbol of the second gain control value to an above-mentioned frame signal set to carry out gain control;
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 does not calculate, the top n symbol of the gain control value of previous frame signal to this frame signal (pilot header) can be used to carry out gain control.
Accordingly, the first computing unit 301 is specifically for calculating the averaged signal energy of the top n symbol controlled through above-mentioned gain of a frame signal.The averaged signal energy of above-mentioned top n symbol specifically can be calculated in conjunction with the second gain control value.
The AGC (automatic gain control) system that the present embodiment provides can be used for controlling the gain of the signal comprising pilot header, the training sequence comprised due to pilot header can not use in signal system, therefore this section of training sequence can not carry out correct process, the AGC (automatic gain control) system that the present embodiment provides utilizes this section of training sequence to carry out the measurement of signal averaging energy just, and carry out calculated gains according to signal averaging energy, and the frame signal of gain to this section of training sequence place calculated is used to carry out gain control.
By the setting of suitable N value; before the valid data symbol of reception one frame signal, complete gain control value calculating and feedback can be guaranteed; thus the up-to-date gain control value calculated can be adopted to carry out gain control to follow-up valid data symbol; digital-analog mixed type feedback AGC method compared to existing technology; response real-time is stronger, is applicable to high-speed mobile or other complex environment.
It should be noted that, the AGC (automatic gain control) system that the present embodiment provides also can be used for the automatic growth control to other suitable type signal, if there is the symbol (i.e. the first modem section) that several can not carry out using in the prostatitis of a frame of this signal, the averaged signal energy of this frame signal then can be determined according to the calculating of the averaged signal energy to these ignore characters, thus the gain control value calculated this frame signal, as long as completed the calculating of gain control value and feed back before useful symbol (i.e. the second modem section) gain to this frame signal control.
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:
Signal processor 401, for calculating the averaged signal energy of the top n symbol of a frame signal, and calculates the first gain control value of an above-mentioned frame signal according to the averaged signal energy of above-mentioned top n symbol; Variable gain amplifier 402, connects with signal processor 401 lotus root, carries out gain control for using the first gain control value to an above-mentioned frame signal.
In the present embodiment, this system also can comprise external timer, external timer is used in after receiver completes and receive the top n symbol of a frame signal, a hardware interrupts is triggered to signal processor 401, to make signal processor 401 respond this hardware interrupts, thus the averaged signal energy of the top n symbol of a frame signal and the first gain control value are calculated.
It should be noted that, user can set the timing of external timer according to the value of N, when the value as N is 3, can completes, then the timing of external timer can be set to 160ms if receive front 3 symbols within 160ms.
Particularly, in the present embodiment, an above-mentioned frame signal can comprise the first modem section and the second modem section, and the first modem section is positioned at the head of an above-mentioned frame signal, and the second modem section is after the first modem section.
Particularly, in the present embodiment, signal processor 401 can specifically for calculating the averaged signal energy of the top n symbol of the first modem section of a frame signal; Variable gain amplifier 402 can carry out gain control specifically for utilizing second modem section of above-mentioned first gain control value to an above-mentioned frame signal.
Wherein the value of N can preset, the value of N should be less than the number of the symbol in a frame signal included by the first modem section, the value of N can be set according to the total number of symbols of the first modem section of a frame signal and Hardware Response Delay speed, to make the automatic growth control completed before whole symbols of above-mentioned first modem section are received this frame signal, thus the second modem section after the first modem section is made to obtain normal gain control.
For example, the first modem section can be the pilot header of a frame signal, the second modem section can be pilot header after effective second modem section.
For TETRA system, in TETRA frame structure, comprise pilot header (the first modem section) valid data symbol (the second modem section) is front, pilot header is the training sequence comprising 6 symbols, because three symbols can characterize the integral energy of whole frame substantially, and through test, Hardware Response Delay speed completes calculating and the feedback of gain control value before being enough supported in and receiving valid data symbol, therefore the value of N can be set as 3; Certainly, when Hardware Response Delay speed, also the value of N can be set to 4 or 5.Certain those skilled in the art also can according to the frame structure of signal, difference to the aspect such as requirement and Hardware Response Delay speed of gain control accuracy, and the suitable concrete value arranging N, is not specifically limited herein.
Alternatively, variable gain amplifier 401 also before signal processor calculates the averaged signal energy of top n symbol of a frame signal, can carry out gain control to utilizing the top n symbol of the second gain control value to this frame signal set.
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 does not calculate, the top n symbol of the gain control value of previous frame signal to this frame signal (pilot header) can be used to carry out gain control.
Accordingly, signal processor 301 is specifically for calculating the averaged signal energy of the top n symbol controlled through above-mentioned gain of a frame signal.The averaged signal energy of above-mentioned top n symbol specifically can be calculated in conjunction with the second gain control value.
The AGC (automatic gain control) system that the present embodiment provides can be used for the automatic growth control to the signal comprising pilot header, the training sequence comprised due to pilot header can not use in signal system, therefore this section of training sequence can not carry out correct process, the auto gain control method that the AGC (automatic gain control) system that the present embodiment provides adopts utilizes this section of training sequence to carry out the measurement of signal averaging energy just, and carry out calculated gains according to signal averaging energy, and use the frame signal of gain to this section of training sequence place calculated to carry out gain control.
By the setting of suitable N value; before the valid data symbol of reception one frame signal, complete gain control value calculating and feedback can be guaranteed; thus the up-to-date gain control value calculated can be adopted to carry out gain control to follow-up valid data symbol; the receiver of digital-analog mixed type feedback AGC method is adopted compared to existing technology; response real-time is stronger, is applicable to high-speed mobile or other complex environment.
For example, in the present embodiment, AGC (automatic gain control) system also can comprise external timer, (external timer is set to the time of reception of N number of signal) after external timer has been used in the reception of top n symbol, a hardware interrupts is triggered to signal processor, to make signal processor respond this hardware interrupts, the calculating of signal energy that top n symbol is averaged.
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 is all analog signals, then between variable gain amplifier 402 and signal processor 401, also can comprise A/D converter and D/A converter, to realize the conversion between analog signal and digital signal.
For example, signal processor can adopt following method of measurement to measure averaged signal energy:
In the communication system based on QPSK and QAM debud mode, baseband signal represents in rectangular coordinate system with orthogonal I, Q signal usually.And in receiving path, by intermediate frequency frequency conversion, base-band digital I, Q signal is converted to after down-conversion sample quantization, again by RRC(Radio Resource Control, radio resource control) filter, low pass filter etc. are by signal filtration and reduce, and form original baseband I, Q signal arrives DSP.Namely the I that DSP receives, Q signal contain the intensity of signal of eating dishes without rice or wine, and by can obtain estimation and the tolerance of this energy to the numerical calculation of sampled point, the method adopted is the summation of vector, and formula is as follows:
After vector summing being carried out to the N number of sampled point received according to above-mentioned formula, obtain average signal energy value AveragePower, to this value with 10 for the end asks log can obtain the dB(decibel of signal) value.
For example, signal processor can adopt following mode to carry out the calculating of the first gain control value:
After obtaining average signal energy value, need, according to this energy value obtained, to calculate the first gain control value, as follows with reference to computing formula:
F(V)＝RSSI–AveragePower-ANT-B
In above-mentioned formula, F(V) be the first gain control value calculated, ANT is antenna damping, B is calibration value, and both are constant, and RSSI is outer signals field intensity value, can carry out estimation by signal processor by top n symbol to obtain, related content belongs to prior art, does not repeat them here.
For example, calculating the first gain control value F(V) after, variable gain amplifier 402 can utilize F(V) gain control is carried out to a frame signal, as shown in Figure 5:
Fig. 5 is gain control effects exemplary plot, and in this example, in figure, longitudinal axis representative is use F(V) carry out the average energy of the output signal after gain control, transverse axis representative be RSSI value, RSSI value is obtained by estimation.Because the optimum reception average energy to output signal of physical circuit is at single-ended about 45mVp_p, lower than 0.6mVp_p with higher than the scope beyond 0.85Vp_p, physical circuit loses the acquisition capability to signal, therefore needs to utilize F(V) gain control is carried out to signal.As can be seen from Figure 5, when signal strength signal intensity RSSI is in the scope of-80dBm to-6dBm, F(V) play a role, gain control is carried out to signal, output signal average energy after gain is controlled remains on single-ended about 45mVp_p, allows physical circuit obtain optimum reception peak value.
It should be noted that, the AGC (automatic gain control) system that the present embodiment provides also can be used for the automatic growth control to other suitable type signal, if there is the symbol (i.e. the first modem section) that several can not carry out using in the prostatitis of a frame of this signal, the averaged signal energy of this frame signal then can be determined according to the calculating of the averaged signal energy to these ignore characters, thus the gain control value calculated this frame signal, as long as completed the calculating of gain control value and feed back before useful symbol (i.e. the second modem section) gain to this frame signal control.
Embodiment four:
The present invention also provides a kind of receiver, and this receiver comprises the automatic control system described by embodiment three, and the particular content about this automatic control system please refer to embodiment three, does not repeat them here.
It should be noted that, above each embodiment all for same inventive concept, in the above-described embodiments,
The description of each embodiment is all emphasized particularly on different fields, in certain embodiment, there is no the part described in detail, can see the associated description of other embodiments.
One of ordinary skill in the art will appreciate that all or part of step in the various methods of above-described embodiment is that the hardware that can carry out instruction relevant by program has come, this program can be stored in a 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.
Above auto gain control method, system and receiver that the embodiment of the present invention provides are described in detail, apply specific case herein to set forth principle of the present invention and execution mode, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (7)
1. an auto gain control method, is characterized in that, comprising:
Calculate the averaged signal energy of the top n symbol of a frame signal; The value of described N presets;
The first gain control value is calculated according to described averaged signal energy;
Described first gain control value is utilized to carry out gain control to a described frame signal;
Wherein, a described frame signal comprises the first modem section and the second modem section;
The averaged signal energy of the top n symbol of described calculating one frame signal comprises: the averaged signal energy calculating the top n symbol in the first modem section of a described frame signal; The value of described N is less than the sum of the symbol that described first modem section comprises, to realize the automatic growth control completed before whole symbols of the first modem section are received this frame signal;
Described utilize described first gain control value to a described frame signal carry out gain control comprise: utilize second modem section of described first gain control value to a described frame signal to carry out gain control.
2. method according to claim 1, is characterized in that, before the averaged signal energy of the top n symbol of described calculating one frame signal, described method also comprises:
The top n symbol of the second gain control value to a described frame signal set is utilized to carry out gain control;
The averaged signal energy of the top n symbol of described calculating one frame signal comprises: the averaged signal energy calculating the top n symbol controlled through described gain of a frame signal.
3. an AGC (automatic gain control) system, is characterized in that, described system comprises:
First computing unit, for calculating the averaged signal energy of the top n symbol of a frame signal; The value of described N presets;
Second computing unit, for calculating the first gain control value according to described averaged signal energy;
Gain control unit, carries out gain control for utilizing described first gain control value to a described frame signal;
Wherein, a described frame signal comprises the first modem section and the second modem section;
Described first computing unit is specifically for calculating the averaged signal energy of the top n symbol in the first modem section of a described frame signal; The value of described N is less than the sum of the symbol that described first modem section comprises, to realize the automatic growth control completed before whole symbols of the first modem section are received this frame signal;
Described gain control unit carries out gain control specifically for utilizing second modem section of described first gain control value to a described frame signal.
4. system according to claim 3, is characterized in that, described gain control unit is also for utilizing the top n symbol of the second gain control value to a described frame signal set to carry out gain control;
Described first computing unit is specifically for calculating the averaged signal energy of the top n symbol controlled through described gain of a frame signal.
5. an AGC (automatic gain control) system, is characterized in that, described system comprises:
Signal processor, for calculating the averaged signal energy of the top n symbol of a frame signal, and calculates the first gain control value of a described frame signal according to described averaged signal energy;
Variable gain amplifier, connects with described signal processor lotus root, carries out gain control for utilizing the first gain control value to a described frame signal;
Wherein, a described frame signal comprises the first modem section and the second modem section;
Described signal processor is specifically for calculating the averaged signal energy of the top n symbol of the first modem section of a described frame signal; The value of described N is less than the sum of the symbol that pilot header comprises, to realize the automatic growth control completed before whole symbols of the first modem section are received this frame signal;
Described variable gain amplifier carries out gain control specifically for utilizing second modem section of the first gain control value to a described frame signal.
6. system according to claim 5, it is characterized in that, described variable gain amplifier also for before the averaged signal energy of the top n symbol of the described frame signal of described signal processor calculating, uses the top n symbol of the second gain control value to a described frame signal set to carry out gain control;
Described signal processor is specifically for calculating the averaged signal energy of the top n symbol controlled through described gain of a described frame signal.
7. a receiver, is characterized in that, described receiver comprises the AGC (automatic gain control) system as described in any one of claim 5-6.
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| CN107294586A (en) * | 2016-04-05 | 2017-10-24 | 中兴通讯股份有限公司 | A kind of method and device of wave beam training stage automatic growth control |
| CN108768425B (en) * | 2018-07-02 | 2021-03-30 | 成都国恒空间技术工程有限公司 | Dynamic adjusting method for automatic gain control AGC |
| US11930347B2 (en) | 2019-02-13 | 2024-03-12 | Dolby Laboratories Licensing Corporation | Adaptive loudness normalization for audio object clustering |
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