CN109787656A - The automatic gain control equipment of OFDM power line communication - Google Patents
The automatic gain control equipment of OFDM power line communication Download PDFInfo
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- CN109787656A CN109787656A CN201910075475.XA CN201910075475A CN109787656A CN 109787656 A CN109787656 A CN 109787656A CN 201910075475 A CN201910075475 A CN 201910075475A CN 109787656 A CN109787656 A CN 109787656A
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Abstract
The invention discloses a kind of automatic gain control equipments of OFDM power line communication comprising: AFE(analog front end), gain controller, digital filter.AFE(analog front end) carries out analog-to-digital conversion for zooming in or out, filtering by received power line carrier analog signal, and to power line carrier analog signal.Gain controller controls AFE(analog front end) to the amplification factor of power line carrier analog signal for generating gain control word, is also used to carry out received power line carrier digital signal the detection and inhibition of impulse disturbances.Digital filter is used to filter out the out-of-band noise of power line carrier digital signal and narrowband interferes.Wherein gain controller includes the first digital gain amplifier, impulse disturbances detection and suppressor, the first power estimator, the first loop filter, gain decomposer.The automatic gain control equipment can substantially reduce the computational complexity of gain control, improve anti-impulse disturbances ability, and processing delay is small, be very suitable to power line communication engineer application.
Description
Technical field
The present invention relates to OFDM field of power line communication, especially with regard to a kind of automatic gain of OFDM power line communication
Control device.
Background technique
Power line communication refers to a kind of communication mode using power line transmission data and media signal, because of its construction cost
The advantages such as low, wide coverage, smart home, power information acquisition with electrical equipment monitoring with etc. fields obtained widely
Using.However power line design for conveying electric energy, the characteristic of channel is very unsatisfactory, show as noise significantly, signal declines
Subtract severity, and there is time variation.The power-line carrier communication system of current mainstream all uses OFDM (orthogonal frequency division multiplexing) thus
Technology by using longer circulation prefix, and combines diversity copy and channel coding technology, to effectively antagonize on power line
Frequency selective fading, multi-path jamming and various noises realize the reliable data transmission of high speed on power line.
The performance of ofdm communication system is easier to be influenced by the power for receiving signal, when received signal power is excessive,
The output signal that will lead to analog-digital converter is overflowed, and generating truncation effect reduces the performance of receiver；Can then it increase when signal is too small
Add quantizing distortion, reduces the sensitivity of receiver.Therefore automatic growth control is needed to adjust the gain amplifier of receiver, make
The input signal amplitude of ADC (analog-digital converter) be adjusted to be suitble to demodulation optimum position, make full use of ADC dynamic range,
Quantizing distortion is reduced, receiver performance is improved.
Power line communication automatic gain control used at present excessively pays close attention to gain adjustment precision and dynamic model mostly
It encloses, does not account for that power line environment noise is significant, burst transfer frame length is shorter (mostly at several milliseconds, generally also only have by longest
20~30 milliseconds) factor that becomes slowly with channel, there is the problems such as computational complexity is high, processing delay is big, unsuitable engineer application.
The information disclosed in the background technology section is intended only to increase the understanding to general background of the invention, without answering
When being considered as recognizing or imply that the information constitutes the prior art already known to those of ordinary skill in the art in any form.
Summary of the invention
The purpose of the present invention is to provide a kind of automatic gain control equipments of OFDM power line communication, can drop significantly
The computational complexity of low gain control, improves anti-impulse disturbances ability, and processing delay is small, is very suitable to power line communication engineering
Using.
To achieve the above object, described the present invention provides a kind of automatic gain control equipment of OFDM power line communication
Automatic gain control equipment is used to carry out gain control to the received power line carrier signal of OFDM receiver comprising: simulation
Front end, gain controller, digital filter.AFE(analog front end) includes that programmable gain amplifier, low-pass filter and modulus turn
Parallel operation is carried for zooming in or out, filtering by itself received power line carrier analog signal, and to the power line
Wave simulation signal carries out analog-to-digital conversion.The input terminal of gain controller is connected with the output end of the AFE(analog front end), the increasing
The output end of beneficial controller is connected with the input terminal of the AFE(analog front end), and the gain controller is for generating gain control word
To control the AFE(analog front end) to the amplification factor of the power line carrier analog signal, it is also used to its own received electricity
The detection and inhibition of line of force carrier wave digital signal progress impulse disturbances.The input terminal of digital filter and the gain controller
Output end be connected, for filter out itself received power line carrier digital signal out-of-band noise and narrowband interfere.
Wherein, the gain controller includes: the first digital gain amplifier, impulse disturbances detection and suppressor, first
Power estimator, the first loop filter, gain decomposer.First digital gain amplifier is used for according to the gain controller
The yield value of input selects corresponding amplification factor, then by itself received power line carrier digital signal according to the amplification
Multiple exports after amplifying.The output of impulse disturbances detection and the input terminal and first digital gain amplifier of suppressor
End is connected, and carries out impulse disturbances detection and inhibition for the power line carrier digital signal to real-time reception.First power
The input terminal of estimator is detected with the impulse disturbances to be connected with the output end of suppressor, for the automatic growth control
The signal power phase of the target adjustment power and each sampled point of itself received power line carrier digital signal of device setting
Subtract to obtain the power error of each sampled point.The input terminal of first loop filter and first power estimator
Output end be connected, first carry out integration operation for the power error to each sampled point, then carry out ratio operation,
The value after ratio operation is shifted later, removes the yield value of fractional part, it is final to obtain integral gains value.Increase
The input terminal of beneficial decomposer is connected with the output end of first loop filter, the output end difference of the gain decomposer
The input terminal of the input terminal of first digital gain amplifier and the programmable gain amplifier of the AFE(analog front end) is connected,
The yield value that the gain decomposer is used to be exported according to first loop filter generates the first yield value and the second gain
First yield value is directly output to first digital gain amplifier, the gain point by value, the gain decomposer
Second yield value is converted to the gain control word and is exported again to the programmable gain amplifier by solution device, described to compile
Journey gain amplifier selects corresponding amplification factor to itself received power line carrier simulation letter according to the gain control word
It number is adjusted.
In a preferred embodiment, first loop filter is advanced to the power error of each sampled point
Row integration operation, the integration operation use following relational expression: Pacc(n)=Pacc(n-1)+Perr(n)*KI, wherein Pacc(n)
Indicate the power integral value of n-th of sampled point, Perr(n) power error of n-th of sampled point, K are indicatedIIndicate customized product
Divide coefficient；Described and then progress ratio operation, later shifts the value after ratio operation, removes fractional part
Yield value, final to obtain integral gains value, which uses following relational expression: Pgain(n)=(Pacc(n)+Perr(n)*Kp)>>
Lfrac, wherein Pacc(0)=0, KpFor customized proportionality coefficient, LfracFor score word length.
In a preferred embodiment, the gain decomposer generates the first yield value and the second yield value includes: institute
Whether state gain decomposer judges the integral gains value of the first loop filter output in the programmable gain amplifier
Actual gain within the scope of, first yield value is 0dB if within the scope of the actual gain, and second yield value is
The yield value of the first loop filter output；If first yield value is institute not within the scope of the actual gain
The yield value for stating the output of the first loop filter exceeds the numerical value beyond part of the actual gain range, second gain
Value be first loop filter output yield value without departing from the actual gain range part numerical value.
In a preferred embodiment, the automatic gain control equipment further includes digital gain compensation device, the number
The input terminal of word gain compensator is connected with the output end of the digital filter, and the digital gain compensation device is for compensating
Signal power losses caused by the digital filter.
In a preferred embodiment, the digital gain compensation device includes: the second digital gain amplifier, the second function
Rate estimator, the second loop filter.The output end phase of the input terminal of second digital gain amplifier and the digital filter
Connection, for being exported after amplifying itself received power line carrier digital signal according to the amplification factor of itself.Second
The input terminal of power estimator is connected with the output end of second digital gain amplifier, for the automatic gain control
Each of the target adjustment power of device processed and the received power line carrier digital signal of second power estimator itself are adopted
The signal power of sampling point subtracts each other to obtain the power error P ' of each sampled pointerr(n).Second loop filter it is defeated
Enter end to be connected with the output end of second power estimator, for the power error P ' to each sampled pointerr(n)
It is weighted and averaged and integration operation, that is, uses following relational expression: P 'avg(n)=P 'avg(n-1)*(1-Ka)+P′err(n)*Ka
With P 'acc(n)=P 'acc(n-1)+P′avg(n)*KI', wherein P 'avg(0)=0, P 'acc(0)=1；KaIndicate customized weighting
Mean coefficient, K 'IFor customized integral coefficient, the P 'avg(n) indicate that the received power line of second power estimator carries
The weighted average of the power of n-th of sampled point of wave digital signal, the P 'acc(n) indicate that second power estimator connects
The weighted average integrated value of the power of n-th of sampled point of the power line carrier digital signal of receipts, the weighted average integrated value is most
Amplification factor of the output to second digital gain amplifier as second digital gain amplifier eventually.
In a preferred embodiment, the automatic gain control equipment further include: SNR detection module, input terminal
It is connected with the digital gain compensation device, the input terminal and the digital gain of output end and the gain controller are mended
The input terminal for repaying device is connected, and the SNR detection module is used to determine the initial position of the received frame of the receiver, first
It is first slightly synchronized, then carries out essence and synchronize, it is when the initial initial position for detecting the frame in thick synchronizing process, then described
Gain controller and the digital gain compensation device stop gain and update, i.e., described first power estimator and first ring
Path filter stops working, and second power estimator and second loop filter stop working.
In a preferred embodiment, the impulse disturbances detection is also used to after detecting impulse disturbances with suppressor
Set pulse detection mark, otherwise reset pulse detection mark, when pulse detection flag set, the gain controller it is described
First power estimator and first loop filter stop working.
In a preferred embodiment, the impulse disturbances detection is also used to after detecting impulse disturbances with suppressor
Set pulse detection mark, otherwise reset pulse detection mark, when pulse detection flag set, the gain controller it is described
First power estimator and first loop filter stop working, and second function of the digital gain compensation device
Rate estimator and second loop filter can software configuration stop working.
In a preferred embodiment, the automatic gain control equipment further include: demodulation and decoding module, input
End is connected with the output end of the SNR detection module, for carrying out to itself received power line carrier digital signal
Time-frequency conversion, frequency domain processing and bit-level processing.
In a preferred embodiment, the AFE(analog front end) is realized with analog circuit, the gain controller, the number
Word filter, the digital gain compensation device, the SNR detection module and the demodulation use digital electricity with decoder module
Realize that modules can be integrated into OFDM power communication baseband chip in road.
Compared with prior art, the automatic gain control equipment of OFDM power line communication according to the present invention is provided with gain
Controller realizes automatic growth control by carrying out the control of integral ratio to sampled point in gain controller, and the process is real-time
It is calculated, is dropped significantly without caching to receive data and carry out complex calculations, the automatic gain control equipments such as logarithm operation
Low computational complexity, improves operation efficiency, in OFDM power line communication, shortens to the processing delay of receiving frame, the dress
The realization set is simpler, has saved cost；It is also provided with digital gain compensation device on the basis of gain controller, number is filtered
Signal power caused by wave device is compensated, and can be further improved the stability of output signal；In addition it is also provided with pulse
Detection and inhibition device, timing synchronization device, reduce impulse disturbances to the shake of gain adjustment and make automatic gain control
System more fast and stable.
Detailed description of the invention
Fig. 1 is the composition signal of the automatic gain control equipment of OFDM power line communication according to an embodiment of the present invention
Figure.
Fig. 2 is that the connection relationship of the internal structure of AFE(analog front end) and gain controller according to an embodiment of the present invention is shown
It is intended to.
Fig. 3 is the composition schematic diagram of digital gain compensation device according to an embodiment of the present invention.
Specific embodiment
With reference to the accompanying drawing, specific embodiments of the present invention will be described in detail, it is to be understood that guarantor of the invention
Shield range is not limited by the specific implementation.
Unless otherwise explicitly stated, otherwise in entire disclosure and claims, term " includes " or its change
Changing such as "comprising" or " including " etc. will be understood to comprise stated element or component, and not exclude other members
Part or other component parts.
It is big for the generally existing computational complexity height of existing power line communication automatic gain control, processing delay
The problems such as, inventor is made that following thinking: the frame structure of domestic and international power line communication standard is substantially all by leading, frame control at present
System and load data composition.Leading is a special periodic sequence, has fabulous correlation, usually by multiple duplicate
Positive synchronizing symbol (SYNCP) and inverted-Sync symbols (SYNCM) composition.Power line communication is a kind of burst transmission mode, and
In view of when power channels be it is a kind of slow become channel, therefore generally without pilot tone or ginseng in the OFDM symbol of frame control and load data
Signal is examined, the automatic growth control, Timing Synchronization and channel estimation in receiver are all by leading progress.Power line has ring
Border noise is significant, burst transfer frame length is shorter, and (mostly at several milliseconds, longest generally also only has 20~30 milliseconds) becomes slowly with channel
The characteristics of.Therefore inventor provides a kind of power line communication automatic gain control equipment, noise resisting ability using These characteristics
By force, computing relay is small, complexity is low, can be more suitable for engineer application.
Fig. 1 is the composition signal of the automatic gain control equipment of OFDM power line communication according to an embodiment of the present invention
Figure.Fig. 2 is the connection relationship of the AFE(analog front end) of the embodiment and the internal structure of gain controller.Automatic growth control dress
It sets including AFE(analog front end) 10, gain controller 11, digital filter 12, it is preferable that further include digital gain compensation device 13, timing
Synchronization module 14 and demodulation and decoder module 15.
AFE(analog front end) 10 includes programmable gain amplifier 10a, low-pass filter 10b, analog-digital converter 10c.It is programmable
The typical actual gain range of gain amplifier 10a is -20dB~63dB, and practical gain ranging external can be arranged, if input
Gain exceeds actual gain range, then takes maximum or minimum value.Programmable gain amplifier 10a is by gain control word to input
Analog signal zoom in or out.Low-pass filter 10b is for filtering out with outer high-frequency signal.Analog-digital converter 10c is electricity
Line of force analog carrier signal is converted to digital signal, carries out complicated Digital Signal Processing convenient for subsequent.
Gain controller 11 first according to the difference of the target power of the signal power and setting of input, generates corresponding gain control
Information processed adjusts the amplification factor of programmable gain amplifier 10a, at the same input signal can be carried out impulse disturbances detection with
Inhibit operation.Specifically, gain controller 11 includes the first digital gain amplifier 11a, impulse disturbances detection and suppressor
11b, the first power estimator 11c, the second loop filter 11d, gain decomposer 11e.
It is 0~63dB that first digital gain amplifier 11a, which typically inputs actual gain range, and actual gain range can be outer
Portion's setting takes maximum or minimum value, increasing is realized with a fixed look-up table if input gain exceeds actual gain range
Benefit value arrives the conversion of amplification factor.Input signal is multiplied by amplification factor, then carries out being that the first digital gain is put after operated in saturation
The output of big device 11a.
Impulse disturbances detection carries out step-by-step counting based on the real-time sampling data of input with suppressor 11b, according to pulse width
Degree carrys out real-time detection pulse with width and respective threshold, and carries out corresponding clipping or zero setting.Impulse disturbances can be diffused into frequency domain
On all subcarriers, amplitude is much higher than ambient noise, increases the requirement to demodulation and time-frequency conversion FFT word length in decoding,
By the way that the probability of FFT transform saturation can be effectively reduced to its clipping or zero setting, receiver performance is improved.Once detecting pulse
Interference, it will set pulse detection mark, it otherwise can reset pulse detection mark.
First power estimator 11c is by target power PtargetWith the power P of each input sample pointsig(n) subtract each other, obtain
Power error Perr(n), it may be assumed that Perr(n)=Ptarget-Psig(n)。
First loop filter 11d is to power error Perr(n) integration operation is first carried out, to integral result, Pacc(n) it carries out
Ratio operation, the yield value after comparative example operation are shifted, and removal fractional part gain obtains integral gains value Pgain(n),
That is: Pacc(n)=Pacc(n-1)+Perr(n)*KIAnd Pgain(n)=(Pacc(n)+Perr(n)*Kp) > > Lfrac.Wherein, Pacc
(0)=0, KI、KpRespectively configurable loop integral coefficient and proportionality coefficient, LfracFor score word length.
Gain decomposer 11e exports P to the first loop filter 11dgain(n) it is decomposed, such as Pgain(n) programmable
Within the scope of the actual gain of gain amplifier 10a, then digital gain is 0dB, is digital gain value beyond part otherwise.Number
Yield value is directly output to the first digital gain amplifier 11a.Analog-gain value is increased by a programmable look-up table
Programmable automation controller of the output to AFE(analog front end) 10 after benefit value to the conversion of the gain control word of programmable gain amplifier 10a
Device 10a.
In 11 control process of gain controller, by carrying out the control of integral ratio to sampled point in gain controller 11
Realize automatic growth control, which calculates, and the complicated fortune such as receives data and carry out logarithm operation without caching
It calculates, so that automatic gain control equipment greatly reduces computational complexity, improves operation efficiency, reduce frame processing delay.And
And in 11 control process of gain controller, if when pulse detection mark is 1, the first power estimator 11c and the second loop
Filter 11d stops working, and gain decomposer 11e output remains unchanged, and prevents interference and influence of noise during normally receiving
The stabilization of automatic gain controller, has been reasonably resistant to signal noise.
Digital filter 12 is made of digital bandwidth/low-pass filter and cascade second order lattice IIR trapper group.For
It filters out out-of-band noise and narrowband interferes, to improve the signal-to-noise ratio of output signal.
Optionally, which further includes digital gain compensation device 13, is used to compensate digital filter
Signal power losses caused by 12.Specifically, the internal structure of digital gain compensation device 13 is as shown in Figure 3 comprising the second number
Word gain amplifier 13a, the second power estimator 13b, the second loop filter 13c.
Digital gain compensation device 13 mainly compensates signal power losses caused by digital filter 12, gain compensation
Range is relatively small.Second digital gain amplifier 13a, the second power estimator 13b are using first with gain controller 11
Digital gain amplifier 11a and the similar structure of the first power estimator 11c, the second loop filter 13c are flat using weighting
+ integral two-level configuration, stability are good.
The algorithm of second loop filter 13c is as follows: P 'avg(n)=P 'avg(n-1)*(1-Ka)+P′err(n)*KaWith P 'acc
(n)=P 'acc(n-1)+P′avg(n)*KI', wherein P 'avg(0)=0, P 'acc(0)=1；KaIndicate customized weighted average system
Number, K 'IIndicate customized integral coefficient, the P 'avg(n) the received power line carrier number of the second power estimator 13b is indicated
The weighted average of the power of n-th of sampled point of word signal, the P 'acc(n) indicate that the second power estimator 13b is received
The weighted average integrated value of the power of n-th of sampled point of power line carrier digital signal, the weighted average integrated value are finally defeated
Amplification factor to the second digital gain amplifier 13a as the second digital gain amplifier out.
Optionally, which further includes SNR detection module 14, is used to determine the initial position of frame,
It is divided to thick synchronous two processes synchronous with essence.In order to obtain preferable performance and reduce computing relay, by the way of cross-correlation；For
The complexity of sliding cross-correlation calculation is reduced, using the local cross-correlation sequence of compression when thick synchronous, and its representation uses
Binary system index mode.
Demodulation includes that time-frequency conversion (FFT) and the processing of subsequent frequency domain and bit-level are handled with decoder module 15.
In the gain control process of the automatic gain control equipment of the OFDM power line communication, if SNR detection module 14
Slightly synchronize and find or impulse disturbances detection with suppressor 11b detects impulse disturbances, i.e., pulse detection mark is 1, then first
Power estimator 11c, the first loop filter 11d and the second power estimator 13b, the second loop filter 13c stop work
Make, the output of the first loop filter 11d and the second loop filter 13c remain unchanged, and prevent from interfering during normally receiving
With the stabilization of influence of noise signal, enables to automatic gain quickly and stablize.
To sum up, the automatic gain control equipment of OFDM power line communication according to the present embodiment is controlled provided with gain
Device realizes automatic growth control, the process real-time perfoming by carrying out the control of integral ratio to sampled point in gain controller
It calculates, is greatly reduced without caching to receive data and carry out complex calculations, the automatic gain control equipments such as logarithm operation
Computational complexity improves operation efficiency, in OFDM power line communication, shortens to the processing delay of receiving frame, the device
It realizes simpler, has saved cost；Digital gain compensation device is also provided on the basis of gain controller, to digital filter
Caused by signal power compensated, can be further improved the stability of output signal；In addition it is also provided with pulse detection
And inhibits device, timing synchronization device, reduce impulse disturbances to the shake of gain adjustment and make automatic growth control more
Add fast and stable.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
The aforementioned description to specific exemplary embodiment of the invention is in order to illustrate and illustration purpose.These descriptions
It is not wishing to limit the invention to disclosed precise forms, and it will be apparent that according to the above instruction, can much be changed
And variation.The purpose of selecting and describing the exemplary embodiment is that explaining specific principle of the invention and its actually answering
With so that those skilled in the art can be realized and utilize a variety of different exemplary implementation schemes of the invention and
Various chooses and changes.The scope of the present invention is intended to be limited by claims and its equivalents.
Claims (10)
1. a kind of automatic gain control equipment of OFDM power line communication, the automatic gain control equipment is used to receive OFDM
The received power line carrier signal of machine carries out gain control characterized by comprising
AFE(analog front end), including programmable gain amplifier, low-pass filter and analog-digital converter are used for itself received electricity
Line of force carrier wave analog signal is zoomed in or out, is filtered, and carries out analog-to-digital conversion to the power line carrier analog signal；
Gain controller, input terminal are connected with the output end of the AFE(analog front end), the output end of the gain controller with
The input terminal of the AFE(analog front end) is connected, before the gain controller controls the simulation for generating gain control word
Hold to the amplification factor of the power line carrier analog signal, be also used to its own received power line carrier digital signal into
The detection and inhibition of row impulse disturbances；And
Digital filter, input terminal are connected with the output end of the gain controller, for filtering out itself received electric power
The out-of-band noise and narrowband of line carrier wave digital signal interfere,
Wherein, the gain controller includes:
First digital gain amplifier, the yield value for being inputted according to the gain controller select corresponding amplification factor,
Then it is exported after itself received power line carrier digital signal being amplified according to the amplification factor；
Impulse disturbances detection and suppressor, input terminal are connected with the output end of first digital gain amplifier, are used for
Impulse disturbances detection and inhibition are carried out to the power line carrier digital signal of real-time reception；
First power estimator, input terminal is detected with the impulse disturbances to be connected with the output end of suppressor, for institute
State the target adjustment power of automatic gain control equipment setting and each sampling of itself received power line carrier digital signal
The signal power of point subtracts each other to obtain the power error of each sampled point；
First loop filter, input terminal are connected with the output end of first power estimator, for described each
The power error of sampled point first carries out integration operation, then carry out ratio operation, later to the ratio operation after value into
Row displacement, removes the yield value of fractional part, final to obtain integral gains value；
Gain decomposer, input terminal are connected with the output end of first loop filter, the gain decomposer it is defeated
Outlet is separately connected the input terminal of first digital gain amplifier and the programmable gain amplifier of the AFE(analog front end)
Input terminal, integral gains value the first gain of generation that the gain decomposer is used to export according to first loop filter
First yield value is directly output to first digital gain and amplified by value and the second yield value, the gain decomposer
Device, second yield value is converted to the gain control word and is exported again to the programmable-gain by the gain decomposer to be put
Big device, the programmable gain amplifier select corresponding amplification factor to itself received electric power according to the gain control word
Line carrier wave analog signal is adjusted.
2. the automatic gain control equipment of OFDM power line communication as described in claim 1, which is characterized in that first ring
Path filter first carries out integration operation to the power error of each sampled point, and the integration operation uses following relational expression:
Pacc(n)=Pacc(n-1)+Perr(n)*KI, wherein Pacc(n) the power integral value of n-th of sampled point, P are indicatederr(n) it indicates
The power error of n-th of sampled point, KIIndicate customized integral coefficient；And
Described and then progress ratio operation, later shifts the value after ratio operation, removes the increasing of fractional part
Benefit value, final to obtain integral gains value, which uses following relational expression: Pgain(n)=(Pacc(n)+Perr(n)*Kp) > >
Lfrac, wherein Pacc(0)=0, KpFor customized proportionality coefficient, LfracFor score word length.
3. the automatic gain control equipment of OFDM power line communication as described in claim 1, which is characterized in that the gain point
It solves device the first yield value of generation and the second yield value includes: that the gain decomposer judges that first loop filter exports
Whether integral gains value is within the scope of the actual gain of the programmable gain amplifier, if within the scope of the actual gain
First yield value is 0dB, and second yield value is the yield value of first loop filter output；If not described
Within the scope of actual gain, then first yield value is that the yield value of first loop filter output exceeds effective increasing
The numerical value beyond part of beneficial range, the yield value that second yield value exports for first loop filter is without departing from institute
State the numerical value of the part of actual gain range.
4. the automatic gain control equipment of OFDM power line communication as described in claim 1, which is characterized in that the automatic increasing
Beneficial control device further includes digital gain compensation device, and the input terminal of the digital gain compensation device is defeated with the digital filter
Outlet is connected, and the digital gain compensation device is for compensating signal power losses caused by the digital filter.
5. the automatic gain control equipment of OFDM power line communication as claimed in claim 4, which is characterized in that the number increases
Beneficial compensator includes:
Second digital gain amplifier, input terminal are connected with the output end of the digital filter, for receiving itself
Power line carrier digital signal amplified according to the amplification factor of itself after export；
Second power estimator, input terminal are connected with the output end of second digital gain amplifier, for described
The target adjustment power of automatic gain control equipment and the received power line carrier number of second power estimator itself are believed
Number the signal power of each sampled point subtract each other to obtaining the power error P ' of each sampled pointerr(n)；
Second loop filter, input terminal are connected with the output end of second power estimator, for described each
The power error P ' of sampled pointerr(n) it is weighted and averaged and integration operation, that is, uses following relational expression: P 'avg(n)=
P′avg(n-1)*(1-Ka)+P′err(n)*KaWith P 'acc(n)=P 'acc(n-1)+P′avg(n)*KI', wherein P 'avg(0)=0,
P′acc(0)=1；KaIndicate customized weighted average coefficients, KI' it is customized integral coefficient, the P 'avg(n) described in indicating
The weighted average of the power of n-th of sampled point of the received power line carrier digital signal of the second power estimator, it is described
P′acc(n) adding for the power of n-th of sampled point of the received power line carrier digital signal of the second power estimator is indicated
Weight average integrated value, the weighted average integrated value final output to second digital gain amplifier is as second number
The amplification factor of gain amplifier.
6. the automatic gain control equipment of OFDM power line communication as claimed in claim 4, which is characterized in that the automatic increasing
Beneficial control device further include:
SNR detection module, input terminal are connected with the digital gain compensation device, output end and the gain controller
Input terminal and the input terminal of the digital gain compensation device be connected, the SNR detection module is for connecing described in determining
The initial position of the received frame of receipts machine, is slightly synchronized first, and it is synchronous then to carry out essence, when detecting institute in thick synchronizing process
The initial initial position of frame is stated, then the gain controller and the digital gain compensation device stop gain update, i.e., described
First power estimator and first loop filter stop working, and second power estimator and second loop
Filter stops working.
7. the automatic gain control equipment of OFDM power line communication as described in claim 1, which is characterized in that the pulse is dry
It disturbs detection and suppressor is also used to the set pulse detection after detecting impulse disturbances and indicates, otherwise reset pulse detection mark,
When pulse detection flag set, first power estimator of the gain controller and first loop filter stop
Work.
8. the automatic gain control equipment of OFDM power line communication as claimed in claim 5, which is characterized in that the pulse is dry
It disturbs detection and suppressor is also used to the set pulse detection after detecting impulse disturbances and indicates, otherwise reset pulse detection mark,
When pulse detection flag set, first power estimator of the gain controller and first loop filter stop
Work, and second power estimator of the digital gain compensation device and second loop filter can software configurations
It stops working.
9. the automatic gain control equipment of OFDM power line communication as claimed in claim 6, which is characterized in that the automatic increasing
Beneficial control device further include:
Module is demodulated and decoded, input terminal is connected with the output end of the SNR detection module, for received to itself
The power line carrier digital signal carries out time-frequency conversion, frequency domain processing and bit-level processing.
10. the automatic gain control equipment of OFDM power line communication as claimed in claim 9, which is characterized in that the simulation
Front end realized with analog circuit, the gain controller, the digital filter, the digital gain compensation device, the timing
Synchronization module and the demodulation and decoder module use digital circuit, and modules can be integrated into OFDM power communication
In baseband chip.
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