CN105827560B - Noise suppressing method applied to wideband OFDM electric line communication system - Google Patents
Noise suppressing method applied to wideband OFDM electric line communication system Download PDFInfo
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- CN105827560B CN105827560B CN201610143460.9A CN201610143460A CN105827560B CN 105827560 B CN105827560 B CN 105827560B CN 201610143460 A CN201610143460 A CN 201610143460A CN 105827560 B CN105827560 B CN 105827560B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2649—Demodulators
- H04L27/265—Fourier transform demodulators, e.g. fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
Abstract
The present invention provides a kind of noise suppressing methods applied to wideband OFDM electric line communication system.In the noise suppressing method; discrete Fourier transform is carried out to receiving end ofdm signal; guard band signal is extracted from output result; a part useless between two neighbouring channels is distributed namely in frequency spectrum; the relevant parameter of impulsive noise is estimated in conjunction with time-domain and frequency-domain method; then according to the estimation parameter of impulsive noise, an envelope window function appropriate impulse noise mitigation in the time domain is constructed.The present invention can effectively inhibit impulsive noise, while greatly reduce spectral leakage, improve the performance of broadband power line communication system.
Description
Technical field
The present invention relates to field of communication technology more particularly to a kind of noises applied to wideband OFDM electric line communication system
Suppressing method.
Background technique
Power-line broadband communication technology utilizes power line network by information fast propagation to each corner.In broadband power
In line communication environment, there is the different various electrical equipments of a large amount of unknown watt levels.The switch of these equipment and work,
And the radio wave that various wireless devices generate, it all can carry out various strong time-varying to broadband power line communication channel strip and make an uproar
Acoustic jamming.Can be divided into according to the difference of noise source: the amplitude of ambient noise and impulsive noise, the latter is significantly larger than ambient noise,
Impulsive noise can be distinguished according to the difference of noise model are as follows: bernoulli Gauss pulse noise and cluster hair style impulsive noise.Pulse
The randomness and high intensity of noise seriously constrain the reliability and handling capacity of broadband power line communication system.
It is at present zero suppression and limiting technology for what is in the method for noise suppressed, be widely used, wherein especially with zero suppression skill
Art is the most simple and effective.But zero suppression processing, significant effect, and for cluster hair style are carried out for bernoulli Gauss pulse noise
For impulsive noise, common zero suppression technology is equivalent to be handled in a simple rectangular window function envelope, due to this
The performance of the problem of non-linear behavior of technology can bring certain spectral leakage, lead to inter-sub-carrier interference, system will be tight
Decline again.Therefore a kind of cluster hair style impulse noise suppression method is needed in the industry, to reduce the limitation bring frequency of zero suppression technology
Spectrum leakage.
Summary of the invention
(1) technical problems to be solved
In view of above-mentioned technical problem, the present invention provides a kind of noise suppressions applied to wideband OFDM electric line communication system
Method processed.
(2) technical solution
The present invention be applied to wideband OFDM electric line communication system noise suppressing method include:
Step A: carrying out discrete Fourier transform to the ofdm signal received, and guard band letter is extracted from result of variations
Number Sg, and calculate its instantaneous mean power Pg；
Step B: according to instantaneous mean power PgOfdm signal is determined whether by cluster hair style impulse noise effect, if OFDM
Signal executes step C by cluster hair style impulse noise effect；Otherwise, step F is executed；
Step C: by the sampled value of each ofdm signal and the adaptive amplitude-limiting based on best false-alarm probability and detection probability
Threshold value TclipIt carries out, statistical comparison is as a result, determine that cluster hair style impulsive noise cluster sends out domain ψ according to comparison result；
Step D: domain ψ is sent out according to cluster hair style impulsive noise cluster and determines burst of noise duration Φ and burst of noise centre bit
Set n0；And
Step E: domain ψ, burst of noise duration Φ and burst center n are sent out according to cluster hair style impulsive noise cluster0Place
The cluster hair style impulsive noise in ofdm signal is managed, realizes noise suppressed；
Step F: OFDM demodulation is executed.
(3) beneficial effect
It can be seen from the above technical proposal that the present invention is in broadband power line communication environment, for the cluster on power line
Hair style impulsive noise makes decisions estimation, determines suitable envelope window function to noise according to the impulsive noise relevant parameter of estimation
It carries out inhibiting processing so as to effectively inhibit impulsive noise, while greatly reducing spectral leakage, improve broadband power
The performance of line communication system.
Detailed description of the invention
Fig. 1 is the noise suppressing method for being applied to wideband OFDM electric line communication system according to first embodiment of the invention
Flow diagram.
Fig. 2 is the detailed process block diagram of step A, B in noise suppressing method shown in Fig. 1；
Fig. 3 is the flow diagram that optimal window function peak A is determined in noise suppressing method shown in Fig. 1.
Specific embodiment
Noise suppressing method of the present invention includes: noise monitoring and estimation, the determination and noise suppressed three of envelope window function
Part.Discrete Fourier transform is carried out to receiving end ofdm signal, guard band signal, that is, frequency are extracted from output result
A part useless between two neighbouring channels is distributed in spectrum, estimates impulsive noise in conjunction with time-domain and frequency-domain method
Relevant parameter constructs an envelope window function appropriate suppressor pulse in the time domain then according to the estimation parameter of impulsive noise
Noise.
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment, and reference
Attached drawing, the present invention is described in more detail.
In an exemplary embodiment of the present invention, it provides a kind of applied to wideband OFDM electric line communication system
Noise suppressing method.
As shown in Figure 1, baseband signal by IDFT convert (Inverse Discrete Fourier Transform, from
Dissipate inverse Fourier transform) generate ofdm signal Symbolk.Ofdm signal SymbolkIt is transmitted in broadband power line channel, thus
Introduce impulsive noise and ambient noise.Therefore, include in the signal that receiving end receives: ofdm signal Symbolk, pulse makes an uproar
Sound and ambient noise.
Please continue to refer to Fig. 1, the noise suppressing method that the present embodiment is applied to wideband OFDM electric line communication system includes:
Step A: discrete Fourier transform (Discrete Fourier is carried out to the ofdm signal received
Transform, abbreviation DFT transform), guard band signal S is extracted from output resultg, and calculate its instantaneous mean power Pg；
Wherein, guard band signal S is calculatedgInstantaneous mean power PgIn, guard band signal SgIn sample point be exactly
The subcarrier of guard band signal finds out the amplitude of each subcarrier, is averaging after carrying out square to the amplitude of each subcarrier
Obtain guard band signal SgInstantaneous mean power Pg。
Referring to figure 2., step A further comprises:
Sub-step A1: discrete Fourier transform is carried out to the ofdm signal received；
Sub-step A2: guard band signal S is extracted in the signal after carrying out discrete Fourier transformg；
Sub-step A3: guard band signal S is found outgIn each subcarrier amplitude, the amplitude of each subcarrier is carried out
It is averaging after square and obtains guard band signal SgInstantaneous mean power Pg。
Step B: according to instantaneous mean power PgOfdm signal is determined whether by cluster hair style impulse noise effect, if OFDM
Signal executes step C by cluster hair style impulse noise effect；Otherwise, step F is executed；
Referring to figure 2., step B further comprises:
Sub-step B1: the mean power P of the guard band of ambient noise AWGN is calculatedw；
Sub-step B2: by instantaneous mean power PgWith mean power PwIt compares, if PgGreater than Pw, illustrate ofdm signal
By cluster hair style impulse noise effect, step C is executed；Otherwise, illustrate that ofdm signal by cluster hair style impulse noise effect, does not execute step
Rapid F.
Step C: by the sampled value of each ofdm signal and the adaptive amplitude-limiting based on best false-alarm probability and detection probability
Threshold value TclipIt carries out, statistical comparison is as a result, determine that cluster hair style impulsive noise cluster sends out domain ψ according to comparison result；
Specifically, step C further comprises:
Sub-step C1: by the sampled value x of each ofdm signalnWith adaptive amplitude-limiting threshold value TclipIt is compared, if xn
Greater than Tclip, record the position of sampled value at this time；
Wherein, adaptive amplitude-limiting threshold value TclipIt is defined as follows:
Wherein, μ is the energy ratio of impulsive noise energy and ambient noise AWGN, i.e., It is white Gaussian
The variance of noise,It is the variance of impulsive noise,It is the variance of ofdm signal；
Sub-step C2: it defines cluster hair style impulsive noise cluster and sends out domain ψ are as follows: the sampled value x of ofdm signalnMiddle amplitude is greater than adaptive
Answer the set of the position of limiting threshold.
Step D: domain ψ is sent out according to cluster hair style impulsive noise cluster and determines burst of noise duration Φ and burst of noise centre bit
Set n0；
In this step, burst of noise duration Φ is the element in the cluster hair style impulsive noise cluster hair domain ψ that statistics obtains
Number, burst of noise center n0The central point of domain ψ is sent out for cluster hair style impulsive noise cluster.
Step E: domain ψ, burst of noise duration Φ and burst center n are sent out according to cluster hair style impulsive noise cluster0Place
The cluster hair style impulsive noise in ofdm signal is managed, realizes noise suppressed；
Wherein, window function envelope function used by being handled for the impulsive noise in cluster hair style impulsive noise cluster hair domain ψ
It is as follows:
Wherein, n is noise sample point；n0For the center of cluster hair style impulsive noise；A is window function peak value, and 0≤A
≤1；The transformation factor of β expression window function；For the width factor of window function, wherein Φ is the burst of noise duration,
N is the size of discrete Fourier transform DFT, i.e. its corresponding sub-carrier number, TsFor the duration of ofdm signal.
Referring to figure 3., the determination process of window function peak A is as follows:
(1) impulsive noise average power density P is determinedi',Wherein NgIndicate guard band signal
SgSub-carriers number, Sg(n) guard band signal S is indicatedgMiddle sample point amplitude；
(2) according to impulsive noise average power density Pi' determine the gross energy E of impulsive noisetotal, wherein Etotal=
NPi', N is the size of discrete Fourier transform DFT, i.e. its corresponding sub-carrier number；
(3) impulsive noise is calculated in the mean power P of time domaini, wherein
(4) repressed pulse energy E is determined according to envelope window functioni, wherein
(5) the dump energy E of ofdm signal is determined according to envelope window functionres, whereinWherein PnFor the mean power of ofdm signal；
(6) window function transformation factor β takes 0.2,0.1,0.05,0.025 and 0.01 respectively, and A is set an initial value 0；
It should be noted that window function transformation factor β is at least 4, can in the range of less than 1 value, window function
Peak A can be more than or equal to 0 in the range of value.
(7) according to Etotal, EiAnd EresSignal-to-noise ratio after calculating impulse noise mitigation, is indicated with SNR, whereinAnd
(8) judge whether the value of A is completed from 0 and change to 1, if it is not, enabling A=A+0.01, go to step (7) and hold
Row；Otherwise, during finding out from 0 to 1, so that the maximum A of SNR, is denoted as optimal window function peak Aopti, as window letter
Number peak A.
It should be noted that in above-mentioned A=A+0.01,0.01 is only a preferred value, and those skilled in the art can be with
As needed carry out value, value can in the range of less than 0.1 value, value is smaller more accurate, but its computational complexity
It is higher.
In this step, the cluster hair style impulsive noise handled in ofdm signal includes following three kinds of situations:
(1) as judgement ofdm signal sample point n and burst of noise center n0Meet (1-2 β) K≤(n-n0)≤(1+2
β) when K, using following suppressing method:
Wherein, xnFor the sampled value of ofdm signal n " ' sample point；|xn| indicate the sampling of ofdm signal n " ' sample point
The amplitude of signal；
(2) as judgement ofdm signal sample point n and noise center n0Meet (- 1-2 β) K≤(n-n0)≤(2β-1)K
When, using following suppressing method:
(3) as judgement ofdm signal sample point n and noise center n0Meet (2 β -1) K≤(n-n0)≤(1-2β)K
When, using following suppressing method:
By above-mentioned steps, the noise suppressed of signal is completed.
Step F: will treated that signal is sent to OFDM demodulation module demodulates.
So far, attached drawing is had been combined the embodiment of the present invention is described in detail.According to above description, art technology
The noise suppressing method that personnel should be applied to wideband OFDM electric line communication system to the present invention has clear understanding.
It should be noted that in attached drawing or specification text, the implementation for not being painted or describing is affiliated technology
Form known to a person of ordinary skill in the art, is not described in detail in field.In addition, the above-mentioned definition to each element and method is simultaneously
It is not limited only to various specific structures, shape or the mode mentioned in embodiment, those of ordinary skill in the art can carry out letter to it
It singly changes or replaces.
In addition, can provide the demonstration of the parameter comprising particular value herein, but these parameters are equal to corresponding value without definite,
But analog value can be similar in acceptable error margin or design constraint.In addition, unless specifically described or must be sequentially
The step of generation, there is no restriction for the sequences of above-mentioned steps in listed above, and can change or rearrange according to required design.
In conclusion the present invention is in broadband power line communication environment, for the cluster hair style impulsive noise on power line into
Row judgement estimation, determines that suitable envelope window function carries out inhibition processing to noise according to the impulsive noise relevant parameter of estimation.
This noise suppressing method can effectively inhibit impulsive noise, while greatly reduce spectral leakage, improve broadband power line
The performance of communication system has preferable practical value.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical scheme and beneficial effects
It describes in detail bright, it should be understood that the above is only a specific embodiment of the present invention, is not intended to restrict the invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution, improvement and etc. done should be included in guarantor of the invention
Within the scope of shield.
Claims (10)
1. a kind of noise suppressing method applied to wideband OFDM electric line communication system characterized by comprising
Step A: discrete Fourier transform is carried out to the ofdm signal received, guard band signal S is extracted from result of variationsg,
And calculate its instantaneous mean power Pg；
Step B: according to instantaneous mean power PgOfdm signal is determined whether by cluster hair style impulse noise effect, if ofdm signal
By cluster hair style impulse noise effect, step C is executed；Otherwise, step F is executed；
Step C: by the sampled value of each ofdm signal and the adaptive amplitude-limiting threshold value based on best false-alarm probability and detection probability
TclipIt carries out, statistical comparison is as a result, determine that cluster hair style impulsive noise cluster sends out domain ψ according to comparison result；
Step D: domain ψ is sent out according to cluster hair style impulsive noise cluster and determines burst of noise duration Φ and burst of noise center n0；
And
Step E: domain ψ, burst of noise duration Φ and burst center n are sent out according to cluster hair style impulsive noise cluster0Handle OFDM
Cluster hair style impulsive noise in signal realizes noise suppressed；
Step F: OFDM demodulation is executed.
2. noise suppressing method according to claim 1, which is characterized in that in the step E, according to following three kinds of situations
Handle the cluster hair style impulsive noise in ofdm signal:
(1) as judgement ofdm signal sample point n and burst of noise center n0Meet (1-2 β) K≤(n-n0)≤(1+2β)K
When, using following suppressing method:
(2) as judgement ofdm signal sample point n and noise center n0Meet (- 1-2 β) K≤(n-n02 β -1 of)≤() K when, adopt
With following suppressing method:
(3) as judgement ofdm signal sample point n and noise center n0Meet (2 β -1) K≤(n-n0)≤(1-2 β) K when, adopt
With following suppressing method:
Wherein, A is window function peak value, and 0≤A≤1；The transformation factor of β expression window function；For the width of window function
The factor, wherein N is the size of discrete Fourier transform, i.e. its corresponding sub-carrier number, TsFor the duration of ofdm signal；
Wherein, xnFor the sampled value of ofdm signal n " ' sample point；|xn| indicate the sampled signal of ofdm signal n " ' sample point
Amplitude.
3. noise suppressing method according to claim 2, which is characterized in that the window function peak A is obtained by following steps
:
(1) impulsive noise average power density P is determinedi',Wherein NgIndicate guard band signal SgIn
Number of sub carrier wave, Sg(n) guard band signal S is indicatedgMiddle sample point amplitude；
(2) according to impulsive noise average power density Pi' determine the gross energy E of impulsive noisetotal, wherein Etotal=NPi'；
(3) impulsive noise is calculated in the mean power P of time domaini, wherein
(4) repressed pulse energy E is determined according to envelope window functioni, whereinWherein,For packet
Network window function；
(5) the dump energy E of ofdm signal is determined according to envelope window functionres, wherein
Wherein PnFor the mean power of ofdm signal, whereinFor envelope window function；
(6) initial value of window function transformation factor β and window function peak A are initialized, wherein window function transformation factor β at least takes 4
Value, each value are respectively less than 1, window function peak A value in the range of being more than or equal to 0；
(7) according to Etotal, EiAnd EresSignal-to-noise ratio after calculating impulse noise mitigation, is indicated with SNR, whereinAnd
(8) judge whether the value of A is completed from 0 and change to 1, if it is not, enabling A=A+a, go to step (7) execution；Otherwise,
During finding out from 0 to 1, so that the maximum A of SNRopti, as window function peak A.
4. noise suppressing method according to claim 3, which is characterized in that described determined according to envelope window function is suppressed
Pulse energy the step of in:
5. noise suppressing method according to claim 3, which is characterized in that the initialization window function transformation factor β with
In the step of initial value of window function peak value: the window function transformation factor β takes 0.2,0.1,0.05,0.025 and 0.01 respectively, institute
Stating window function peak A initial value is 0.
6. noise suppressing method according to claim 3, which is characterized in that in described the step of enabling A=A+a, a=
0.01。
7. noise suppressing method according to any one of claim 1 to 6, which is characterized in that in the step A, find out
Each guard band signal SgThe amplitude of subcarrier calculates guard band signal S according to these amplitudesgInstantaneous mean power Pg,
Wherein, the guard band signal SgSubcarrier corresponds to the guard band signal SgIn sample point.
8. noise suppressing method according to any one of claim 1 to 6, which is characterized in that the step B includes:
Sub-step B1: the mean power P of the guard band of ambient noise is calculatedw；And
Sub-step B2: by instantaneous mean power PgWith mean power PwIt compares, if PgGreater than Pw, illustrate that ofdm signal is sent out by cluster
Type impulse noise effect executes step C；Otherwise, illustrate that ofdm signal by cluster hair style impulse noise effect, does not execute step F.
9. noise suppressing method according to any one of claim 1 to 6, which is characterized in that the step C includes:
Sub-step C1: by the sampled value x of each ofdm signalnWith adaptive amplitude-limiting threshold value TclipIt is compared, if xnIt is greater than
Tclip, record the position of sampled value at this time；And
Sub-step C2: the cluster for defining cluster hair style impulsive noise sends out domain ψ are as follows: the sampled value x of ofdm signalnMiddle amplitude is greater than adaptive
The set of the position of limiting threshold；
Wherein, the adaptive amplitude-limiting threshold value TclipIt is defined as follows:
Wherein, μ is the energy ratio of impulsive noise energy and ambient noise, i.e., It is white Gaussian noise
Variance,It is the variance of impulsive noise,It is the variance of ofdm signal.
10. noise suppressing method according to any one of claim 1 to 6, which is characterized in that in the step D, noise
Burst duration Φ is the element number in the cluster hair style impulsive noise cluster hair domain ψ that statistics obtains, burst of noise center
n0The central point of domain ψ is sent out for cluster hair style impulsive noise cluster.
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| US20070280097A1 (en) * | 2006-06-06 | 2007-12-06 | Himax Technologies, Inc. | Impulsive noise suppression scheme in orthogonal frequency division multiplexing |
| CN103457638A (en) * | 2013-09-11 | 2013-12-18 | 大连理工大学 | Restraining device and restraining method for burst impulse noise of power line communication channel |
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| US20070280097A1 (en) * | 2006-06-06 | 2007-12-06 | Himax Technologies, Inc. | Impulsive noise suppression scheme in orthogonal frequency division multiplexing |
| CN103457638A (en) * | 2013-09-11 | 2013-12-18 | 大连理工大学 | Restraining device and restraining method for burst impulse noise of power line communication channel |
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