CN107086875B - Automatic gain control equipment and method - Google Patents
Automatic gain control equipment and method Download PDFInfo
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- CN107086875B CN107086875B CN201710234393.6A CN201710234393A CN107086875B CN 107086875 B CN107086875 B CN 107086875B CN 201710234393 A CN201710234393 A CN 201710234393A CN 107086875 B CN107086875 B CN 107086875B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/21—Monitoring; Testing of receivers for calibration; for correcting measurements
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Abstract
The invention discloses a kind of automatic gain control equipments, the invention also discloses a kind of auto gain control methods, for a kind of new agc circuit structure of in-band on-channel wireless terminal receiver design, the signal quality, changed power and dynamic range requirement of different phase are matched using close coupling multistage multi-channel A GC framework, it is mutually calibrated using analog signal and the respective characteristic of digital signal, the road Shi Ge signal can obtain optimal demodulation performance.The close coupling multistage multi-channel A GC circuit structure that the present invention designs, each road signal that IBOC receiver can be allowed to demodulate, especially digital signal realizes optimum signal-noise ratio, so that having same laser propagation effect, i.e., the consistent quality of reception and coverage area with the multiple signals that frequency broadcasts.
Description
Technical field
The present invention relates to the communications field more particularly to a kind of automatic gain control equipment and methods.
Background technique
In a wireless communication environment, since the wireless channel of transmitting radio frequency signal is time variation channel, there is various letters
Number fade-out, and communicating pair can may also mutually move or switching channels, so the radio frequency that wireless receiver receives
Signal power be it is unpredictable, inherently fluctuated in a very big range.When signal source is close or signal transmits item
When part is fine, receiver may receive very strong signal, and when signal source is far or transmission conditions are bad, receiver may
Receive very faint signal.The fluctuation range for the signal power that receiver is likely to be received is very big, i.e. the dynamic of wireless signal
Range is very big.
In order to realize the wireless receiver of Larger Dynamic range, it is necessary to realize the automatic gain control circuit of Larger Dynamic range,
The signal gain of adjustment receiver stablizes signal power near an expectation numerical value, to reduce signal power change as far as possible
Change bring influence, allow receiver it is stable demodulate data.Automatic gain control circuit in receivers has been set
Before suitable signal gain, receiver probably can not normal demodulated signal.Therefore, it is logical that automatic growth control, which becomes,
An essential part in the realization of letter system.
Automatic growth control abbreviation AGC is exactly the gain automatically to signal, and power, amplitude are controlled in other words.One
As be in this one end of receiver, control the amplifier on radio-frequency module to analog signal by detecting the signal energy that receives
Power is adjusted, or does amplitude adjusted to the digital signal after sampling to realize the control of signal power.
Agc circuit realizes the target of signal power adjustment, first is that the radiofrequency signal of simulation is amplified to digital-to-analogue conversion tolerance
The optimal power of change, two are to ensure that receiver has sufficiently large dynamic range to handle the signal of varying strength.Therefore, it uses
Agc circuit can utmostly reduce the quantizing noise of receiver analog-digital converter introducing, and optimal letter is provided for demodulator
It makes an uproar and compares, reach the minimum bit error rate.
In wireless digital audio broadcast world, the technical solutions such as HD Radio, CDRadio, CDR pass through digital simulation aliasing
With the mode broadcast, existing modulated-analog signal and new digital modulation signals is allowed to broadcast in the same frequency band, i.e., in band
With frequency (In Band On Channel, IBOC) technology.The feature of IBOC technology maximum without new frequency resource allocation,
Realize the smooth transition of case of conventional analog broadcast to digital broadcasting.
Such IBOC broadcast system mixed transport analog fm signal and digital ofdm modulation signal in the same frequency,
These signals have different transmission powers, and the signal of time-varying occur due to the influence of fading effect during wireless transmission
Power ratio, so that IBOC wireless receiver faces very big challenge in progress Signal separator reconciliation timing.It is especially existing wirelessly to connect
The agc circuit design structure of receipts machine is difficult to meet the optimum reception effect of IBOC signal, the multiple signals that can not be allowed while broadcast
It is optimal received signal to noise ratio simultaneously.The multiple signals broadcasted with frequency are caused the different quality of reception and coverage area occur, it is right
Popularization, engineering construction complexity and the market efficiency of IBOC technology bring significant impact.
Above content is only used to facilitate the understanding of the technical scheme, and is not represented and is recognized that above content is existing skill
Art.
Summary of the invention
Present invention is primarily aimed at providing the auto gain control method and device of a kind of in-band on-channel wireless receiver,
Aiming to solve the problem that can not allow while the multiple signals that broadcast while the technical issues of be optimal received signal to noise ratio in the prior art.
To achieve the above object, the present invention also provides a kind of automatic gain control equipment, described device includes:
First AGC module, signal separation module, the 2nd AGC module and the 3rd AGC module；
The first AGC module carries out gain to the mixed signal according to the first yield value for receiving mixed signal
Control, and signal separation module will be sent to by the mixed signal of gain control；
The signal separation module, for being separated to the mixed signal by gain control, after separation
Analog signal is sent to the 2nd AGC module, and the digital signal after separation is sent to the 3rd AGC module；
The 2nd AGC module obtains gain for carrying out gain control to the analog signal according to the second yield value
Analog signal；
The 3rd AGC module obtains gain for carrying out gain control to the digital signal according to third yield value
Digital signal；
The 2nd AGC module is also used to be adjusted first yield value according to the second power difference, according to institute
It states the second power difference to be adjusted the third yield value, the first yield value adjusted is sent to the first AGC
Third yield value adjusted is sent to the 3rd AGC module by module；Second power difference is according to the simulation
The difference that second power estimation value of signal and the second preset reference performance number are subtracted each other, second power estimation value is pre-
If the average power content of the analog signal in the period.
Preferably, the 2nd AGC module according to second power difference by following formula to first yield value into
Row adjustment:
Gnext1=G1+α1·ΔP1+β1·ΔP2
Wherein, Gnext1For first yield value adjusted, G1For first yield value, Δ P1For the first difference power
Value, first power difference are to be subtracted each other according to the first power estimation value and the first preset reference performance number of the mixed signal
Obtained difference, first power estimation value are the average power content of the mixed signal in preset time period；ΔP2For institute
State the second power difference, α1And β1For the preset gain regulation coefficient for being adapted to the first AGC module.
Preferably, the 2nd AGC module according to second power difference by following formula to the third yield value into
Row adjustment:
Gnext3=G3+α3·ΔP3+β3·ΔP2
Wherein, Gnext3For the third yield value adjusted, G3For the third yield value, Δ P3For third difference power
Value, the third power difference are to be subtracted each other according to the third power estimation value and third preset reference performance number of the digital signal
Obtained difference, the third power estimation value are the average power content of the digital signal in preset time period；ΔP2For institute
State the second power difference, α3And β3For the preset gain regulation coefficient for being adapted to the 3rd AGC module.
Preferably, described device further include: demodulator module, the demodulator module, for receiving the 3rd AGC mould
The gain digital signal that block is sent, demodulates the gain digital signal；
The demodulator module is also used to the Signal to Noise Ratio (SNR) value according to the demodulator module to the 3rd AGC module
α3And β3It is modified, and receives the revised gain digital signal of the 3rd AGC module, by the revised gain
Digital signal is demodulated.
Preferably, the demodulator module is also used to when the SNR value of the demodulator module is less than preset threshold, will
The α3It tunes up and by the β3It turns down；When the SNR value of the demodulator module is greater than or equal to preset threshold, by the α3
It turns down and by the β3It tunes up.
To achieve the above object, the present invention also provides a kind of methods of automatic growth control, which is characterized in that the method
Include:
First AGC module receives mixed signal, carries out gain control to the mixed signal according to the first yield value, and will
Signal separation module is sent to by the mixed signal that gain controls；
The signal separation module separates the mixed signal by gain control, and the simulation after separation is believed
Number it is sent to the 2nd AGC module, the digital signal after separation is sent to the 3rd AGC module；
The 2nd AGC module carries out gain control to the analog signal according to the second yield value, obtains gain analog
Signal；
The 3rd AGC module carries out gain control to the digital signal according to third yield value, obtains gain digital
Signal；
The 2nd AGC module is adjusted first yield value according to the second power difference, according to described second
Power difference is adjusted the third yield value, and the first yield value adjusted is sent to the first AGC module, will
Third yield value adjusted is sent to the 3rd AGC module；Second power difference is according to the analog signal
The difference that second power estimation value and the second preset reference performance number are subtracted each other, second power estimation value are preset time
The average power content of the analog signal in section.
Preferably, the 2nd AGC module according to second power difference by following formula to first yield value into
Row adjustment:
Gnext1=G1+α1·ΔP1+β1·ΔP2
Wherein, Gnext1For first yield value adjusted, G1For first yield value, Δ P1For the first difference power
Value, first power difference are to be subtracted each other according to the first power estimation value and the first preset reference performance number of the mixed signal
Obtained difference, first power estimation value are the average power content of the mixed signal in preset time period；ΔP2For institute
State the second power difference, α1And β1For the preset gain regulation coefficient for being adapted to the first AGC module.
Preferably, the 2nd AGC module according to second power difference by following formula to the third yield value into
Row adjustment:
Gnext3=G3+α3·ΔP3+β3·ΔP2
Wherein, Gnext3For the third yield value adjusted, G3For the third yield value, Δ P3For third difference power
Value, the third power difference are to be subtracted each other according to the third power estimation value and third preset reference performance number of the digital signal
Obtained difference, the third power estimation value are the average power content of the digital signal in preset time period；ΔP2For institute
State the second power difference, α3And β3For the preset gain regulation coefficient for being adapted to the 3rd AGC module.
Preferably, demodulator module receives the gain digital signal that the 3rd AGC module is sent, to the gain digital
Signal is demodulated；
According to the Signal to Noise Ratio (SNR) value of the demodulator module to the α of the 3rd AGC module3And β3It is modified, and connects
The revised gain digital signal of the 3rd AGC module is received, the revised gain digital signal is demodulated.
Preferably, when the SNR value of the demodulator module is less than preset threshold, by the α3It tunes up and by the β3It adjusts
It is small；When the SNR value of the demodulator module is greater than or equal to preset threshold, by the α3It turns down and by the β3It tunes up.
The invention discloses a kind of auto gain control methods, and the invention also discloses a kind of automatic growth control dresses
It sets, devises a kind of new agc circuit structure for IBOC receiver, difference is matched using close coupling multistage multi-channel A GC framework
Signal quality, changed power and the dynamic range requirement in stage carry out phase using analog signal and the respective characteristic of digital signal
Mutually calibration, the road Shi Ge signal can obtain optimal demodulation performance.The close coupling multistage multi-channel A GC circuit knot that the present invention designs
Structure, each road signal that IBOC receiver can be allowed to demodulate, especially digital signal realize optimum signal-noise ratio, so that broadcasted with frequency
Multiple signals have same laser propagation effect, i.e., the consistent quality of reception and coverage area.
Detailed description of the invention
Fig. 1 is a kind of automatic gain control equipment circuit diagram of the present invention；
Fig. 2 is a kind of automatic gain control equipment first embodiment schematic diagram of the present invention；
A kind of automatic gain control equipment second embodiment schematic diagram of Fig. 3 present invention；
Fig. 4 is a kind of auto gain control method flow diagram of the present invention；
Fig. 5 is a kind of auto gain control method first embodiment flow diagram of the present invention；
Fig. 6 is a kind of auto gain control method second embodiment flow diagram of the present invention.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
Fig. 1 is a kind of automatic gain control equipment circuit diagram of the present invention, and referring to Fig.1, described device includes:
First AGC module 10, signal separation module 20, the 2nd AGC module 30 and the 3rd AGC module 40；
The first AGC module 10 increases the mixed signal according to the first yield value for receiving mixed signal
Benefit control, and signal separation module 20 will be sent to by the mixed signal of gain control；
It should be noted that the reception mixed signal, received mixed signal, which can be, to be received by receiver by penetrating
The mixed signal that frequency front end and analog-digital converter issue is by the way that the original signal of radio frequency or base band to be modulated and digital-to-analogue
Convert the mixed signal to be formed；Received mixed signal, which can also be, directly receives existing mixed signal.Wherein, described mixed
Closing signal to be includes the set of analog AM signal, digital ofdm modulation signal, or being includes analog AM signal, simulation tune
The set of other signals such as frequency signal, digital ofdm modulation signal, the present invention are without restriction to mixed signal at this.
It is understood that the automatic growth control (automatic gain control) is the increasing for making amplifying circuit
The autocontrol method that benefit is automatically adjusted with signal strength.Automatic growth control is one kind of clipping output, it utilizes line
Property amplification and compression amplification efficient combination output signal is adjusted.When weak signal input, linear amplifier circuit work
Guarantee the intensity of output signal；When input signal reaches some strength, starting compression amplifying circuit reduces output amplitude.
That is, AGC function can automatically control the amplitude of gain by changing input and output compression factor.AGC is subdivided into AGCi
(input automatic growth control) and AGCo (output automatic growth control).
It should be noted that described carry out automatic growth control for mixed signal, wherein automatic growth control includes inside
AGC implementation and outside AGC implementation use external AGC implementation or interior according to the concrete condition of radio-frequency front-end
Portion's AGC implementation；The AGC can be divided into two types by Signal Regulation mode --- adjust the outer of external analog radiofrequency signal
The portion AGC and inside AGC for adjusting internal digital sampled signal.External AGC is the power that signal is received by calculating, and is penetrated to control
The variable gain amplifier of frequency module, so that radio-frequency module output signal is fallen within the best dynamic of analog-digital converter simultaneously
It keeps stablizing, there is feedback signal of the numeric field to analog domain here.And inside AGC is then to calculate the increasing for receiving signal
Beneficial regulation coefficient, then with the signal multiplication after delay so that output signal is fallen within the best dynamic of demodulator of PM signal PM
And keep stable.
The signal separation module 20, for being separated to the mixed signal by gain control, after separation
Analog signal be sent to the 2nd AGC module 30, the digital signal after separation is sent to the 3rd AGC module 40；
It should be noted that the process separated to the mixed signal by gain control includes: will be by increasing
The mixed signal of benefit control implements separation, and analog signal and digital OFDM signal to isolate respectively set up a rear class again
AGC, i.e. the 2nd AGC module 30 and the 3rd AGC module 40 do further adjustment to the signal after separation, wherein the 2nd AGC module
30 are responsible for carrying out the analog signal gain control, and the 3rd AGC module 40 is responsible for carrying out gain control to the digital signal,
If having the signal of other types, then corresponding with the type signal set after implementing separation to the mixed signal certainly
An AGC module is set, for carrying out gain control to the type signal.
The 2nd AGC module 30 is increased for carrying out gain control to the analog signal according to the second yield value
Beneficial analog signal；
The 3rd AGC module 40 is increased for carrying out gain control to the digital signal according to third yield value
Beneficial digital signal；
The 2nd AGC module 30 is also used to be adjusted first yield value according to the second power difference, according to
Second power difference is adjusted the third yield value, and the first yield value adjusted is sent to described first
Third yield value adjusted is sent to the 3rd AGC module 40 by AGC module 10；According to second power difference
The difference that second power estimation value of the analog signal and the second preset reference performance number are subtracted each other, second power are estimated
Evaluation is the average power content of the analog signal in preset time period.
It is understood that the 2nd AGC module 30 is to the first AGC module 10 and the 3rd AGC module 40
Be modified, refer to it is described each agc circuit is mutually corrected, that is, utilize analog signal and the respective characteristic of digital signal to carry out
Mutually calibration, the road Shi Ge signal can obtain optimal demodulation performance；It is described to utilize digital demodulation signal modified result gain tune
Integral coefficient, which refers to, demodulates digital signal using demodulated equipments such as similar demodulators, to obtain corresponding digital signal demodulation knot
Fruit is adjusted gain adjustment factor by the digital demodulation signal result.Wherein, the gain adjustment factor, takes
Value size has conclusive influence to the convergence rate of yield value and stability.Biggish gain adjustment factor value receives AGC
Speed quickening is held back, fast-changing dynamic is adapted to and receives environment, but its stability is poor, it is easier to it is influenced by noise signal,
There is obvious shake in signal after leading to gain adjustment；Lesser gain adjustment factor value can make signal jitter very small, but
Convergence rate is slow, is not suitable for fast-changing dynamic and receives environment.For this purpose, this programme uses tightly coupled mode, allow
Each agc circuit is mutually corrected, and utilizes digital demodulation signal modified result gain adjustment factor, so that each AGC can work
Make in optimum state.
Correspondingly, the 2nd AGC module 30 passes through following formula to first yield value according to second power difference
It is adjusted:
Gnext1=G1+α1·ΔP1+β1·ΔP2
Wherein, Gnext1For first yield value adjusted, G1For first yield value, Δ P1For the first difference power
Value, first power difference are to be subtracted each other according to the first power estimation value and the first preset reference performance number of the mixed signal
Obtained difference, first power estimation value are the mean power of the mixed signal in preset time period by gain control
Value；ΔP2For second power difference, α1And β1For the preset gain regulation coefficient for being adapted to the first AGC module.
It should be noted that using the calculated result of the 2nd AGC module 30 after separation to the first AGC module
10 are modified.Because the analog fm signal is constant envelope signal, more accurate to the tracking of signal strength
α1And β1For the preset gain regulation coefficient for being adapted to the first AGC module 10, one can be arranged according to specific system
A suitable determining value.
Correspondingly, the 2nd AGC module 30 passes through following formula to the third yield value according to second power difference
It is adjusted:
Gnext3=G3+α3·ΔP3+β3·ΔP2
Wherein, Gnext3For the third yield value adjusted, G3For the third yield value, Δ P3For third difference power
Value, the third power difference are to be subtracted each other according to the third power estimation value and third preset reference performance number of the digital signal
Obtained difference, the third power estimation value are the average power content of the digital signal in preset time period；ΔP2For institute
State the second power difference, α3And β3For the preset gain regulation coefficient for being adapted to the 3rd AGC module 40.
It will be appreciated that using the calculated result of the 2nd AGC module 30 after separation to the 3rd AGC module 40
It is modified.Because the digital power signal in digital-to-analogue mixed signal is far below analog fm signal, under high-noise environment, institute
The noise component(s) containing significant proportion in the data of the 3rd AGC module 40 input is stated, so that signal power estimation inaccuracy.And institute
The data of the 2nd AGC module 30 input are stated as FM signal sampling, signal-to-noise ratio with higher, so its calculated result can be used to
The 3rd AGC module 40 is modified.
It should be noted that power difference is the difference subtracted each other according to power estimation value and preset reference performance number,
The power estimation value is the average power content of signal in preset time period, calculates N number of sampled signal s within a preset time
(i) mean power, calculation formula are as follows:
Wherein, PestFor the power estimation value, the tracking and control cycle length that N is AGC, s (i) is sampled signal.
Current gain value is adjusted using power difference, the power difference is the power estimation value and default ginseng
The difference of performance number is examined, calculation formula is as follows:
Δ P=Pref-Pest
Wherein, Δ P is the power difference, PrefFor the preset reference performance number, PestFor the power estimation value.
Fig. 2 is a kind of automatic gain control equipment first embodiment schematic diagram of the present invention, based on above-mentioned shown in FIG. 1 interior
Hold, referring to Fig. 2, described device further include: demodulator module 50；
The first AGC module 10 increases the mixed signal according to the first yield value for receiving mixed signal
Benefit control, and signal separation module 20 will be sent to by the mixed signal of gain control；
The signal separation module 20, for being separated to the mixed signal by gain control, after separation
Analog signal be sent to the 2nd AGC module 30, the digital signal after separation is sent to the 3rd AGC module 40；
The 2nd AGC module 30 is increased for carrying out gain control to the analog signal according to the second yield value
Beneficial analog signal；
The 3rd AGC module 40 is increased for carrying out gain control to the digital signal according to third yield value
Beneficial digital signal；
The 2nd AGC module 30 is also used to be adjusted first yield value according to the second power difference, according to
Second power difference is adjusted the third yield value, and the first yield value adjusted is sent to described first
Third yield value adjusted is sent to the 3rd AGC module 40 by AGC module 10；According to second power difference
The difference that second power estimation value of the analog signal and the second preset reference performance number are subtracted each other, second power are estimated
Evaluation is the average power content of the analog signal in preset time period.
The demodulator module 50, the gain digital signal sent for receiving the 3rd AGC module 40, to the increasing
Beneficial digital signal is demodulated；
In the concrete realization, a demodulator module can also be set again after the 2nd AGC module 30, for connecing
The gain digital signal that the 3rd AGC module 40 is sent is received, the gain digital signal is demodulated；If separation certainly
There are also other kinds of signals other than analog signal and digital signal for mixed signal afterwards, can also reset one accordingly
A demodulator module, for being demodulated to the type signal, so that the type signal, which reverts to, can directly carry out communication service
Signal, the present invention is without restriction to this；
The demodulator module 50 is also used to the Signal to Noise Ratio (SNR) value according to the demodulator module 50 to the 3rd AGC
The α of module 403And β3It is modified, and receives the revised gain digital signal of the 3rd AGC module 40, by the amendment
Gain digital signal afterwards is demodulated.
The demodulator module 50 is also used to when the SNR value of the demodulator module 50 is less than preset threshold, will be described
α3It tunes up and by the β3It turns down；When the SNR value of the demodulator module 50 is greater than or equal to preset threshold, by the α3It adjusts
It is small and by the β3It tunes up.
It should be noted that the increasing according to the SNR estimated result of the demodulator module 50 to the 3rd AGC module 40
Beneficial regulation coefficient is modified.The SNR estimated result of the demodulator module 50 indicates the 3rd AGC module 40 input number
According to noise specific gravity.When the SNR value of the demodulator module 50 is less than preset threshold, i.e., SNR value is higher, illustrates noise specific gravity
It is small, correspondingly by the α3It tunes up, the β3It turns down；When the SNR value of the demodulator module 50 is greater than or equal to preset threshold
When, i.e., SNR value is lower, illustrates noise than great, correspondingly by the α3Turn the β down3It tunes up；α3And β3It is described to be adapted to
The preset gain regulation coefficient of 3rd AGC module 40, which can be with dynamic regulation.
A kind of automatic gain control equipment second embodiment schematic diagram of Fig. 3 present invention, is based on above-mentioned content shown in Fig. 2,
Referring to Fig. 3, described device further include: radio-frequency front-end 01 and analog-digital converter 02；
The first AGC module 10 increases the mixed signal according to the first yield value for receiving mixed signal
Benefit control, and signal separation module 20 will be sent to by the mixed signal of gain control；
The signal separation module 20, for being separated to the mixed signal by gain control, after separation
Analog signal be sent to the 2nd AGC module 30, the digital signal after separation is sent to the 3rd AGC module 40；
The 2nd AGC module 30 is increased for carrying out gain control to the analog signal according to the second yield value
Beneficial analog signal；
The 3rd AGC module 40 is increased for carrying out gain control to the digital signal according to third yield value
2nd AGC module 30 described in beneficial digital signal is also used to be adjusted first yield value according to the second power difference, root
The third yield value is adjusted according to second power difference, the first yield value adjusted is sent to described first
Third yield value adjusted is sent to the 3rd AGC module 40 by AGC module 10；According to second power difference
The difference that second power estimation value of the analog signal and the second preset reference performance number are subtracted each other, second power are estimated
Evaluation is the average power content of the analog signal in preset time period.
The demodulator module 50, the gain digital signal sent for receiving the 3rd AGC module 40, to the increasing
Beneficial digital signal is demodulated；
In the concrete realization, a demodulator module can also be set again after the 2nd AGC module 30, for connecing
The gain digital signal that the 3rd AGC module 40 is sent is received, the gain digital signal is demodulated；If separation certainly
There are also other kinds of signals other than analog signal and digital signal for mixed signal afterwards, can also reset one accordingly
A demodulator module, for being demodulated to the type signal, so that the type signal, which reverts to, can directly carry out communication service
Signal, the present invention is without restriction to this；
The demodulator module 50 is also used to the Signal to Noise Ratio (SNR) value according to the demodulator module 50 to the 3rd AGC
The α of module 403And β3It is modified, and receives the revised gain digital signal of the 3rd AGC module 40, by the amendment
Gain digital signal afterwards is demodulated.
The demodulator module 50 is also used to when the SNR value of the demodulator module 50 is less than preset threshold, will be described
α3It tunes up and by the β3It turns down；When the SNR value of the demodulator module 50 is greater than or equal to preset threshold, by the α3It adjusts
It is small and by the β3It tunes up.
The radio-frequency front-end 01 for utilizing radio frequency or Baseband Receiver external signal, and the external signal is sent
To the analog-digital converter 02；
It should be noted that the radio-frequency front-end is by power amplifier (PA), filter, duplexer, RF switch, low noise
The composition such as acoustic amplifier, receiver/transmitter.Its intermediate power amplifier is responsible for the radiofrequency signal amplification of transmission channel；Filter
It is responsible for transmitting and receives the filtering of signal；Duplexer is responsible for the duplex switching and reception/sendaisle radiofrequency signal of FDD system
Filtering；RF switch is responsible for the switching received, between transmission channel；Low-noise amplifier is mainly used for the small letter in receiving channel
Number amplification；Receiver/transmitter is used for the frequency conversion of radiofrequency signal, channel selection.
The analog-digital converter 02, the external signal sent for receiving the radio-frequency front-end 01, by the outside
Signal is sent to the first AGC module 10 at mixed signal, and by the mixed signal by digital-to-analogue conversion；
In the concrete realization, the radiofrequency signal of simulation is amplified to the optimal power of digital analog converter quantization, it is ensured that receive
Machine has sufficiently large dynamic range to handle the signal of varying strength, can utmostly reduce receiver mould using agc circuit
The quantizing noise that number converter introduces, and optimal signal-to-noise ratio is provided for demodulator, reach the minimum bit error rate；It is big in order to realize
The wireless receiver of dynamic range, it is necessary to which the automatic gain control circuit for realizing Larger Dynamic range, the signal for adjusting receiver increase
Benefit stablizes signal power near an expectation numerical value, to reduce the influence of signal power variations bring as far as possible, makes to connect
Receipts machine can be stable demodulate data.
It should be understood that in a wireless communication environment, since the wireless channel of transmitting radio frequency signal is time variation channel,
There is various signal fadeout phenomenons, and communicating pair can may also mutually move or switching channels, so wireless receiving
The RF signal power that machine receives be it is unpredictable, inherently fluctuated in a very big range.When signal source is close or
When person's signal transmission conditions are fine, receiver may receive very strong signal, when signal source is far or transmission conditions are bad
When, receiver is likely to be received very faint signal.The fluctuation range for the signal power that receiver is likely to be received is very big, i.e., without
The dynamic range of line signal is very big.
It is understood that fade-out includes slow fading and rapid fading, the slow fading refers to due in wave transmissions
Shadow effect caused by blocking on path by building or massif etc. and the loss generated.The rapid fading refers to, moves
Multipath-propagated signal caused by scatterer (landform, atural object and moving body etc.) near dynamic platform is superimposed in receiving point, causes to connect
It collects mail number quick the phenomenon that rising and falling.
Fig. 4 is a kind of auto gain control method flow diagram of the present invention, referring to Fig. 4, which comprises
S1, the first AGC module receive mixed signal, carry out gain control to the mixed signal according to the first yield value,
And signal separation module will be sent to by the mixed signal of gain control；
It should be noted that the reception mixed signal, received mixed signal, which can be, to be received by receiver by penetrating
The mixed signal that frequency front end and analog-digital converter issue is by the way that the original signal of radio frequency or base band to be modulated and digital-to-analogue
Convert the mixed signal to be formed；Received mixed signal, which can also be, directly receives existing mixed signal.Wherein, described mixed
Closing signal to be includes the set of analog AM signal, digital ofdm modulation signal, or being includes analog AM signal, simulation tune
The set of other signals such as frequency signal, digital ofdm modulation signal, the present invention are without restriction to mixed signal at this.
It is understood that the automatic growth control (automatic gain control) is the increasing for making amplifying circuit
The autocontrol method that benefit is automatically adjusted with signal strength.Automatic growth control is one kind of clipping output, it utilizes line
Property amplification and compression amplification efficient combination output signal is adjusted.When weak signal input, linear amplifier circuit work
Guarantee the intensity of output signal；When input signal reaches some strength, starting compression amplifying circuit reduces output amplitude.
That is, AGC function can automatically control the amplitude of gain by changing input and output compression factor.AGC is subdivided into AGCi
(input automatic growth control) and AGCo (output automatic growth control).
It should be noted that described carry out automatic growth control for mixed signal, wherein automatic growth control includes inside
AGC implementation and outside AGC implementation use external AGC implementation or interior according to the concrete condition of radio-frequency front-end
Portion's AGC implementation；Wherein, the radio-frequency front-end is by power amplifier (PA), filter, duplexer, RF switch, low noise
The composition such as amplifier, receiver/transmitter.Its intermediate power amplifier is responsible for the radiofrequency signal amplification of transmission channel；Filter is negative
Duty transmitting and the filtering for receiving signal；Duplexer is responsible for the duplex switching and the filter of reception/sendaisle radiofrequency signal of FDD system
Wave；RF switch is responsible for the switching received, between transmission channel；Low-noise amplifier is mainly used for the small signal in receiving channel
Amplification；Receiver/transmitter is used for the frequency conversion of radiofrequency signal, channel selection.
It should be understood that the AGC can be divided into two types by Signal Regulation mode --- adjust external analog radio frequency letter
Number external AGC and adjust internal digital sampled signal inside AGC.External AGC is the power that signal is received by calculating, and is come
The variable gain amplifier for controlling radio-frequency module, so that radio-frequency module output signal falls in the best dynamic of analog-digital converter
Within and keep stable, there is the feedback signal of numeric field to analog domain here.And inside AGC is then to calculate reception letter
Number gain adjustment factor, then with the signal multiplication after delay so that output signal falls in the optimal dynamic model of demodulator of PM signal PM
Within enclosing and keep stable.
S2, the signal separation module separate the mixed signal by gain control, by the mould after separation
Quasi- signal is sent to the 2nd AGC module, and the digital signal after separation is sent to the 3rd AGC module；
It should be noted that the process separated to the mixed signal by gain control includes: will be by increasing
The mixed signal of benefit control implements separation, and analog signal and digital signal to isolate respectively set up a rear class AGC again, i.e.,
2nd AGC module and the 3rd AGC module do further adjustment to the signal after separation, wherein the 2nd AGC module is responsible for described
Analog signal carries out gain control, and the 3rd AGC module is responsible for carrying out gain control to the digital signal, if certainly to described
After mixed signal implements separation, there is the signal of other types, then one AGC module of setting corresponding with the type signal,
For carrying out gain control to the type signal.
S3, the 2nd AGC module carry out gain control to the analog signal according to the second yield value, obtain gain mould
Quasi- signal；
S4, the 3rd AGC module carry out gain control to the digital signal according to third yield value, obtain gain number
Word signal；
S5, the 2nd AGC module are adjusted first yield value according to the second power difference, according to described
Two power differences are adjusted the third yield value, and the first yield value adjusted is sent to the first AGC module,
Third yield value adjusted is sent to the 3rd AGC module；Second power difference is according to the analog signal
The second power estimation value and the difference subtracted each other of the second preset reference performance number, when second power estimation value is default
Between in section the analog signal average power content.
It should be noted that the 2nd AGC module repairs the first AGC module and the 3rd AGC module
Just, refer to and mutually correct each agc circuit, i.e., mutually calibrated using analog signal and the respective characteristic of digital signal,
The road Shi Ge signal can obtain optimal demodulation performance
It should be understood that described referred to using digital demodulation signal modified result gain adjustment factor using similar to demodulator
Equal demodulated equipments demodulate digital signal, to obtain corresponding digital signal demodulation result, pass through the digital demodulation signal
As a result gain adjustment factor is adjusted.Wherein, the gain adjustment factor, convergence rate of the value size to yield value
There is conclusive influence with stability.Biggish gain adjustment factor value accelerates AGC convergence rate, is adapted to quickly become
The dynamic of change receives environment, but its stability is poor, it is easier to be influenced by noise signal, the signal after leading to gain adjustment occurs bright
Aobvious shake；Lesser gain adjustment factor value can make signal jitter very small, but convergence rate is slow, not be suitable for quickly
The dynamic of variation receives environment.For this purpose, this programme uses tightly coupled mode, each agc circuit is allowed mutually to correct, and utilizes number
Word signal demodulation result modified gain regulation coefficient, so that each AGC can work in optimum state.
In the concrete realization, the radiofrequency signal of simulation is amplified to the optimal power of digital analog converter quantization, it is ensured that receive
Machine has sufficiently large dynamic range to handle the signal of varying strength, can utmostly reduce receiver mould using agc circuit
The quantizing noise that number converter introduces, and optimal signal-to-noise ratio is provided for demodulator, reach the minimum bit error rate；It is big in order to realize
The wireless receiver of dynamic range, it is necessary to which the automatic gain control circuit for realizing Larger Dynamic range, the signal for adjusting receiver increase
Benefit stablizes signal power near an expectation numerical value, to reduce the influence of signal power variations bring as far as possible, makes to connect
Receipts machine can be stable demodulate data.
Correspondingly, the 2nd AGC module according to second power difference by following formula to first yield value into
Row adjustment:
Gnext1=G1+α1·ΔP1+β1·ΔP2
Wherein, Gnext1For first yield value adjusted, G1For first yield value, Δ P1For the first difference power
Value, first power difference are to be subtracted each other according to the first power estimation value and the first preset reference performance number of the mixed signal
Obtained difference, first power estimation value are the mean power of the mixed signal in preset time period by gain control
Value；ΔP2For second power difference, α1And β1For the preset gain regulation coefficient for being adapted to the first AGC module.
It should be noted that using separation after the 2nd AGC module calculated result to the first AGC module into
Row amendment.Because the analog fm signal is constant envelope signal, more accurate to the tracking of signal strength
α1And β1For the preset gain regulation coefficient for being adapted to the first AGC module, one can be arranged according to specific system
It is suitable to determine value.
Correspondingly, the 2nd AGC module according to second power difference by following formula to the third yield value into
Row adjustment:
Gnext3=G3+α3·ΔP3+β3·ΔP2
Wherein, Gnext3For the third yield value adjusted, G3For the third yield value, Δ P3For third difference power
Value, the third power difference are to be subtracted each other according to the third power estimation value and third preset reference performance number of the digital signal
Obtained difference, the third power estimation value are the average power content of the digital signal in preset time period；ΔP2For institute
State the second power difference, α3And β3For the preset gain regulation coefficient for being adapted to the 3rd AGC module.
It should be noted that using separation after the 2nd AGC module calculated result to the 3rd AGC module into
Row amendment.Because the digital power signal in digital-to-analogue mixed signal is far below analog fm signal, described under high-noise environment
Noise component(s) containing significant proportion in the data of 3rd AGC module input, so that signal power estimation inaccuracy.And described
The data of two AGC modules input are FM signal sampling, signal-to-noise ratio with higher, so its calculated result can be used to described
3rd AGC module is modified.
It should be noted that power difference is the difference subtracted each other according to power estimation value and preset reference performance number,
The power estimation value is the average power content of signal in preset time period, calculates N number of sampled signal s within a preset time
(i) mean power, calculation formula are as follows:
Wherein, PestFor the power estimation value, the tracking and control cycle length that N is AGC, s (i) is sampled signal.
Current gain value is adjusted using power difference, the power difference is the power estimation value and default ginseng
The difference of performance number is examined, calculation formula is as follows:
Δ P=Pref-Pest
Wherein, Δ P is the power difference, PrefFor the preset reference performance number, PestFor the power estimation value.
Fig. 5 is a kind of auto gain control method first embodiment flow diagram of the present invention, based on above-mentioned shown in Fig. 4 interior
Hold, referring to Fig. 5, which comprises
S1, the first AGC module receive mixed signal, carry out gain control to the mixed signal according to the first yield value,
And signal separation module will be sent to by the mixed signal of gain control；
S2, the signal separation module separate the mixed signal by gain control, by the mould after separation
Quasi- signal is sent to the 2nd AGC module, and the digital signal after separation is sent to the 3rd AGC module；
S3, the 2nd AGC module carry out gain control to the analog signal according to the second yield value, obtain gain mould
Quasi- signal；
S4, the 3rd AGC module carry out gain control to the digital signal according to third yield value, obtain gain number
Word signal；
S5, the 2nd AGC module are adjusted first yield value according to the second power difference, according to described
Two power differences are adjusted the third yield value, and the first yield value adjusted is sent to the first AGC module,
Third yield value adjusted is sent to the 3rd AGC module；Second power difference is according to the analog signal
The second power estimation value and the difference subtracted each other of the second preset reference performance number, when second power estimation value is default
Between in section the analog signal average power content.
S6, demodulator module receive the gain digital signal that the 3rd AGC module is sent, to the gain digital signal
It is demodulated；
In the concrete realization, a demodulator module can also be set again after the 2nd AGC module, for receiving
The gain digital signal that the 3rd AGC module is sent, demodulates the gain digital signal；If certainly after separation
There are also other kinds of signals other than analog signal and digital signal for mixed signal, can also reset a solution accordingly
Device module is adjusted, for demodulating to the type signal, so that the type signal reverts to the letter that can directly carry out communication service
Number, the present invention is without restriction to this；
S7, the demodulator module are according to the Signal to Noise Ratio (SNR) value of the demodulator module to the α of the 3rd AGC module3
And β3It is modified, and receives the revised gain digital signal of the 3rd AGC module, by the revised gain digital
Signal is demodulated.
S8, the demodulator module are when the SNR value of the demodulator module is less than preset threshold, by the α3Tune up and
By the β3It turns down；When the SNR value of the demodulator module is greater than or equal to preset threshold, by the α3It turns down and will be described
β3It tunes up.
It should be noted that according to the SNR estimated result of the demodulator module to the gain tune of the 3rd AGC module
Integral coefficient is modified.The SNR estimated result of the demodulator module indicates the noise of the 3rd AGC module input data
Specific gravity.When the SNR value of the demodulator module is less than preset threshold, i.e., SNR value is higher, illustrates that noise specific gravity is small, correspondingly
By the α3It tunes up, the β3It turns down；When the SNR value of the demodulator module be greater than or equal to preset threshold when, i.e., SNR value compared with
It is low, illustrate noise than great, correspondingly by the α3Turn the β down3It tunes up；α3And β3To be adapted to the 3rd AGC module
Preset gain regulation coefficient, which can be with dynamic regulation.
Fig. 6 is a kind of auto gain control method second embodiment flow diagram of the present invention, based on above-mentioned shown in fig. 5 interior
Hold, referring to Fig. 6, which comprises
S1, the first AGC module receive mixed signal, carry out gain control to the mixed signal according to the first yield value,
And signal separation module will be sent to by the mixed signal of gain control；
S2, the signal separation module separate the mixed signal by gain control, by the mould after separation
Quasi- signal is sent to the 2nd AGC module, and the digital signal after separation is sent to the 3rd AGC module；
S3, the 2nd AGC module carry out gain control to the analog signal according to the second yield value, obtain gain mould
Quasi- signal；
S4, the 3rd AGC module carry out gain control to the digital signal according to third yield value, obtain gain number
Word signal；
S5, the 2nd AGC module are adjusted first yield value according to the second power difference, according to described
Two power differences are adjusted the third yield value, and the first yield value adjusted is sent to the first AGC module,
Third yield value adjusted is sent to the 3rd AGC module；Second power difference is according to the analog signal
The second power estimation value and the difference subtracted each other of the second preset reference performance number, when second power estimation value is default
Between in section the analog signal average power content.
S6, demodulator module receive the gain digital signal that the 3rd AGC module is sent, to the gain digital signal
It is demodulated；
S7, the demodulator module are according to the Signal to Noise Ratio (SNR) value of the demodulator module to the α of the 3rd AGC module3
And β3It is modified, and receives the revised gain digital signal of the 3rd AGC module, by the revised gain digital
Signal is demodulated.
S8, the demodulator module are when the SNR value of the demodulator module is less than preset threshold, by the α3Tune up and
By the β3It turns down；When the SNR value of the demodulator module is greater than or equal to preset threshold, by the α3It turns down and will be described
β3It tunes up.
It should be noted that according to the SNR estimated result of the demodulator module to the gain tune of the 3rd AGC module
Integral coefficient is modified.The SNR estimated result of the demodulator module indicates the noise of the 3rd AGC module input data
Specific gravity.When the SNR value of the demodulator module is less than preset threshold, i.e., SNR value is higher, illustrates that noise specific gravity is small, correspondingly
By the α3It tunes up, the β3It turns down；When the SNR value of the demodulator module be greater than or equal to preset threshold when, i.e., SNR value compared with
It is low, illustrate noise than great, correspondingly by the α3Turn the β down3It tunes up；α3And β3To be adapted to the 3rd AGC module
Preset gain regulation coefficient, which can be with dynamic regulation.
Before the step S1, the method also includes:
S01, radio-frequency front-end are used to utilize radio frequency or Baseband Receiver external signal, and the external signal is sent to mould
Number converter；
It should be noted that the radio-frequency front-end is by power amplifier (PA), filter, duplexer, RF switch, low noise
The composition such as acoustic amplifier, receiver/transmitter.Its intermediate power amplifier is responsible for the radiofrequency signal amplification of transmission channel；Filter
It is responsible for transmitting and receives the filtering of signal；Duplexer is responsible for the duplex switching and reception/sendaisle radiofrequency signal of FDD system
Filtering；RF switch is responsible for the switching received, between transmission channel；Low-noise amplifier is mainly used for the small letter in receiving channel
Number amplification；Receiver/transmitter is used for the frequency conversion of radiofrequency signal, channel selection.
S02, analog-digital converter receive the external signal that the radio-frequency front-end is sent, and the external signal is passed through number
Mould is converted into mixed signal, and the mixed signal is sent to the first AGC module；
In the concrete realization, the radiofrequency signal of simulation is amplified to the optimal power of digital analog converter quantization, it is ensured that receive
Machine has sufficiently large dynamic range to handle the signal of varying strength, can utmostly reduce receiver mould using agc circuit
The quantizing noise that number converter introduces, and optimal signal-to-noise ratio is provided for demodulator, reach the minimum bit error rate；It is big in order to realize
The wireless receiver of dynamic range, it is necessary to which the automatic gain control circuit for realizing Larger Dynamic range, the signal for adjusting receiver increase
Benefit stablizes signal power near an expectation numerical value, to reduce the influence of signal power variations bring as far as possible, makes to connect
Receipts machine can be stable demodulate data.
It should be understood that in a wireless communication environment, since the wireless channel of transmitting radio frequency signal is time variation channel,
There is various signal fadeout phenomenons, and communicating pair can may also mutually move or switching channels, so wireless receiving
The RF signal power that machine receives be it is unpredictable, inherently fluctuated in a very big range.When signal source is close or
When person's signal transmission conditions are fine, receiver may receive very strong signal, when signal source is far or transmission conditions are bad
When, receiver is likely to be received very faint signal.The fluctuation range for the signal power that receiver is likely to be received is very big, i.e., without
The dynamic range of line signal is very big.
It is understood that fade-out includes slow fading and rapid fading, the slow fading refers to due in wave transmissions
Shadow effect caused by blocking on path by building or massif etc. and the loss generated.The rapid fading refers to, moves
Multipath-propagated signal caused by scatterer (landform, atural object and moving body etc.) near dynamic platform is superimposed in receiving point, causes to connect
It collects mail number quick the phenomenon that rising and falling.
It should be noted that, in this document, the terms "include", "comprise" or its any other variant are intended to non-row
His property includes, so that the process, method, article or the system that include a series of elements not only include those elements, and
And further include other elements that are not explicitly listed, or further include for this process, method, article or system institute it is intrinsic
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including being somebody's turn to do
There is also other identical elements in the process, method of element, article or system.
The serial number of the above embodiments of the invention is only for description, does not represent the advantages or disadvantages of the embodiments.
Through the above description of the embodiments, those skilled in the art can be understood that above-described embodiment side
Method can be realized by means of software and necessary general hardware platform, naturally it is also possible to by hardware, but in many cases
The former is more preferably embodiment.Based on this understanding, technical solution of the present invention substantially in other words does the prior art
The part contributed out can be embodied in the form of software products, which is stored in a storage medium
In (such as ROM/RAM, magnetic disk, CD), including some instructions are used so that a terminal device (can be mobile phone, computer, clothes
Business device, air conditioner or the network equipment etc.) execute method described in each embodiment of the present invention.
The above is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (10)
1. a kind of device of automatic growth control, which is characterized in that described device includes: the first AGC module, Signal separator mould
Block, the 2nd AGC module and the 3rd AGC module；
The first AGC module carries out gain control to the mixed signal according to the first yield value for receiving mixed signal
System, and signal separation module will be sent to by the mixed signal of gain control；
The signal separation module, for being separated to the mixed signal by gain control, by the simulation after separation
Signal is sent to the 2nd AGC module, and the digital signal after separation is sent to the 3rd AGC module；
The 2nd AGC module obtains gain analog for carrying out gain control to the analog signal according to the second yield value
Signal；
The 3rd AGC module obtains gain digital for carrying out gain control to the digital signal according to third yield value
Signal；
The 2nd AGC module is also used to be adjusted first yield value according to the second power difference, according to described
Two power differences are adjusted the third yield value, and the first yield value adjusted is sent to the first AGC module,
Third yield value adjusted is sent to the 3rd AGC module；Second power difference is according to the analog signal
The second power estimation value and the difference subtracted each other of the second preset reference performance number, when second power estimation value is default
Between in section the analog signal average power content.
2. device as described in claim 1, which is characterized in that the 2nd AGC module is logical according to second power difference
Following formula is crossed to be adjusted first yield value:
Gnext1=G1+α1·ΔP1+β1·ΔP2
Wherein, Gnext1For first yield value adjusted, G1For first yield value, Δ P1For the first power difference, institute
Stating the first power difference is to subtract each other to obtain according to the first power estimation value and the first preset reference performance number of the mixed signal
Difference, first power estimation value be preset time period in by gain control mixed signal average power content；Δ
P2For second power difference, α1And β1For the preset gain regulation coefficient for being adapted to the first AGC module.
3. device as described in claim 1, which is characterized in that the 2nd AGC module is logical according to second power difference
Following formula is crossed to be adjusted the third yield value:
Gnext3=G3+α3·ΔP3+β3·ΔP2
Wherein, Gnext3For the third yield value adjusted, G3For the third yield value, Δ P3For third power difference, institute
Stating third power difference is to subtract each other to obtain according to the third power estimation value and third preset reference performance number of the digital signal
Difference, the third power estimation value be preset time period in the digital signal average power content；ΔP2It is described
Two power differences, α3And β3For the preset gain regulation coefficient for being adapted to the 3rd AGC module.
4. device as claimed in claim 3, which is characterized in that described device further include: demodulator module, the demodulator mould
Block, the gain digital signal sent for receiving the 3rd AGC module, demodulates the gain digital signal；
The demodulator module is also used to the α according to the Signal to Noise Ratio (SNR) value of the demodulator module to the 3rd AGC module3
And β3It is modified, and receives the revised gain digital signal of the 3rd AGC module, by the revised gain digital
Signal is demodulated.
5. device as claimed in claim 4, which is characterized in that the demodulator module is also used to when the demodulator module
SNR value be less than preset threshold when, by the α3It tunes up and by the β3It turns down；Be greater than when the SNR value of the demodulator module or
When equal to preset threshold, by the α3It turns down and by the β3It tunes up.
6. a kind of method of automatic growth control, which is characterized in that the described method includes:
First AGC module receives mixed signal, carries out gain control to the mixed signal according to the first yield value, and will pass through
The mixed signal of gain control is sent to signal separation module；
The signal separation module separates the mixed signal by gain control, and the analog signal after separation is sent out
It send to the 2nd AGC module, the digital signal after separation is sent to the 3rd AGC module；
The 2nd AGC module carries out gain control to the analog signal according to the second yield value, obtains gain analog signal；
The 3rd AGC module carries out gain control to the digital signal according to third yield value, obtains gain digital signal；
The 2nd AGC module is adjusted first yield value according to the second power difference, according to second power
Difference is adjusted the third yield value, and the first yield value adjusted is sent to the first AGC module, will be adjusted
Third yield value afterwards is sent to the 3rd AGC module；Second power difference is according to the second of the analog signal
The difference that power estimation value and the second preset reference performance number are subtracted each other, second power estimation value are in preset time period
The average power content of the analog signal.
7. method as claimed in claim 6, which is characterized in that the 2nd AGC module is logical according to second power difference
Following formula is crossed to be adjusted first yield value:
Gnext1=G1+α1·ΔP1+β1·ΔP2
Wherein, Gnext1For first yield value adjusted, G1For first yield value, Δ P1For the first power difference, institute
Stating the first power difference is to subtract each other to obtain according to the first power estimation value and the first preset reference performance number of the mixed signal
Difference, first power estimation value be preset time period in by gain control mixed signal average power content；Δ
P2For second power difference, α1And β1For the preset gain regulation coefficient for being adapted to the first AGC module.
8. method as claimed in claim 6, which is characterized in that the 2nd AGC module is logical according to second power difference
Following formula is crossed to be adjusted the third yield value:
Gnext3=G3+α3·ΔP3+β3·ΔP2
Wherein, Gnext3For the third yield value adjusted, G3For the third yield value, Δ P3For third power difference, institute
Stating third power difference is to subtract each other to obtain according to the third power estimation value and third preset reference performance number of the digital signal
Difference, the third power estimation value be preset time period in the digital signal average power content；ΔP2It is described
Two power differences, α3And β3For the preset gain regulation coefficient for being adapted to the 3rd AGC module.
9. method according to claim 8, which is characterized in that demodulator module receives the increasing that the 3rd AGC module is sent
Beneficial digital signal demodulates the gain digital signal；
According to the Signal to Noise Ratio (SNR) value of the demodulator module to the α of the 3rd AGC module3And β3It is modified, and receives institute
The revised gain digital signal of the 3rd AGC module is stated, the revised gain digital signal is demodulated.
10. method as claimed in claim 9, which is characterized in that when the SNR value of the demodulator module is less than preset threshold
When, by the α3It tunes up and by the β3It turns down；When the SNR value of the demodulator module is greater than or equal to preset threshold, by institute
State α3It turns down and by the β3It tunes up.
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| CN111224723B (en) * | 2019-12-24 | 2022-02-15 | 展讯通信（上海）有限公司 | Calibration method and system of radio frequency front-end module, electronic equipment and storage medium |
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| KR102190358B1 (en) * | 2014-12-10 | 2020-12-11 | 삼성전자주식회사 | Apparatus and method for cotrolling gain in communication system |
| CN104485909B (en) * | 2014-12-31 | 2017-12-19 | 上海艾为电子技术股份有限公司 | Gain control method and device |
-
2017
- 2017-04-11 CN CN201710234393.6A patent/CN107086875B/en active Active
- 2017-06-22 WO PCT/CN2017/089626 patent/WO2018188193A1/en active Application Filing
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007110816A1 (en) * | 2006-03-24 | 2007-10-04 | Nxp B.V. | Automatic gain control circuit |
| CN102307168A (en) * | 2011-08-06 | 2012-01-04 | 桂林市思奇通信设备有限公司 | Separation method and receiving device of digital broadcasting analog-to-digital (A/D) signal at frequency modulation (FM) broadcast band |
| CN102394714A (en) * | 2011-08-06 | 2012-03-28 | 桂林市思奇通信设备有限公司 | Method and system for receiving digital broadcasting signals in frequency modulation (FM) broadcast bands |
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| WO2018188193A1 (en) | 2018-10-18 |
| CN107086875A (en) | 2017-08-22 |
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