CN109361633A - A kind of anti-time domain impulse interference method of reseptance of coded OFDM systems - Google Patents

A kind of anti-time domain impulse interference method of reseptance of coded OFDM systems Download PDF

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CN109361633A
CN109361633A CN201811476429.2A CN201811476429A CN109361633A CN 109361633 A CN109361633 A CN 109361633A CN 201811476429 A CN201811476429 A CN 201811476429A CN 109361633 A CN109361633 A CN 109361633A
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noise
interference
ofdm
time domain
symbol
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CN109361633B (en
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刘松淘
王军
黄巍
李雪迎
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University of Electronic Science and Technology of China
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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
    • H04L25/03012—Arrangements for removing intersymbol interference operating in the time domain
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0045—Arrangements at the receiver end
    • H04L1/0054—Maximum-likelihood or sequential decoding, e.g. Viterbi, Fano, ZJ algorithms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0071—Use of interleaving
    • 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
    • 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
    • H04L2025/03592—Adaptation methods
    • H04L2025/03598—Algorithms
    • H04L2025/03611—Iterative algorithms

Abstract

The invention belongs to fields of communication technology, particularly relate to a kind of anti-time domain impulse interference method of reseptance of coded OFDM systems.The present invention is not have the characteristics of data-signal using high frequency zero setting subcarrier, directly does IFFT/FFT operation, carries out noise reduction process, compared to calculating channelSimpler, wherein D is Np×LtMatrix and D (i :)=F (ni,:),1≤i≤Np,The case where being the LS estimation of guide symbol, and avoiding the occurrence of singular matrix.Since there are time domain impulse disturbances for channel, can all there be interference on the entire frequency band of frequency domain, at this moment desired performance cannot be obtained by Error Correction of Coding merely, and although interference can be reduced to the method that interference sections zoom in and out by using, soft demodulation performance is still undesirable, and this interference is regarded as equivalent noise by the present invention together with noise, calculates the mean power of equivalent noise, to replace the noise variance in soft demodulation, system performance is improved.

Description

A kind of anti-time domain impulse interference method of reseptance of coded OFDM systems
Technical field
The invention belongs to fields of communication technology, particularly relate to a kind of anti-time domain impulse interference of coded OFDM systems Method of reseptance.
Background technique
In recent years, people to using mobile Internet as representative data traffic communicate requirement it is higher and higher, wireless communication Technology is also being developed with the direction for providing the higher rate of information throughput for user.High speed is carried out in complex environment in order to realize Rate and highly reliable communication, communication system need to have the features such as high spectrum utilization and preferable ability of anti-multipath.It is orthogonal Frequency division multiplexing (OFDM) technology is just to have become the solution of many wireless communication systems because having these features.? Currently in commercial 4G mobile communication solution, orthogonal frequency division multiplexing has become the key technology of program physical layer One of.
In order to provide highly reliable communication, system needs to have the ability of anti-wireless channel interference.Under fading channel, channel Coefficient has significant change, produces very important inter-carrier interference (ICI), (the Zhang Shichang cognitive radio system of document 1 Middle NC-OFDM channel estimation technique research [D] University of Electronic Science and Technology, 2009) it gives under normal conditions, training can be passed through Symbol estimates channel coefficients, and carries out equilibrium to signal is received, then passes through intertexture scatter errors bit, and then utilize and compile Code carries out error correction, to reach performance requirement.But when interfering in channel there are very important time domain impulse, this method is just It fails.Time domain impulse interference how is fought, new challenge is proposed to OFDM technology.
The modeling of Gauss time domain impulse are as follows:
Wherein τ is pulse duration, TpIt is the pulse period, it is 0 that p (t), which obeys mean value, and variance is pulse_power's Gaussian Profile.
(research [D] China Civil Aviation of the non-linear OFDM receiver pulse interference suppression method of Cong Wan and performance is big for document 2 Learn, 2017) in give a kind of method of pulse clipping, document 3 (grind under boat impulsive noise by the parameter Estimation of ofdm system Study carefully [D] Xian Electronics Science and Technology University, 2014) give the method based on Myriad filtering.Both methods is all dry to pulse It disturbs and is handled in itself, by impulse noise mitigation to improving performance.But the processing for receiving waveform can produce actual signal Raw distortion, and Myriad filtering is suitable for short pulse.Therefore, this patent is directed to coded OFDM systems, and in conjunction with document 2, (Cong Wan is non- Research [D] Civil Aviation University of China of linear OFDM receiver pulse interference suppression method and performance, 2017) time domain impulse clipping Or extinguish algorithm, based on time domain impulse interference after FFT transform, jamming power can uniformly be diffused into all OFDM subcarriers Characteristic estimates jamming power using the high frequency zero setting idle sub-carrier of OFDM symbol, and the interference function based on the estimation Rate modifies the noise power in soft demodulation to lifting system performance.
Summary of the invention
The present invention provides a kind of anti-time domain impulse interference signal reception schemes of coded OFDM systems, including following step Suddenly, wherein step 1 is time-domain processing method, is optional step, step 2~4 are frequency domain techniques:
Step 1: clipping being carried out to time-domain signal or extinguishing is handled.
If T is to receive waveform frame duration, receive signal y (t), 0 < t < T is represented by
Y (t)=h (t) * x (t)+w (t)+Jp(t) (2)
Wherein x (t) is transmitting signal, and h (t) is channel time domain shock response, and w (t) is Gaussian noise, JpIt (t) is time domain Impulse disturbances.Assuming that pulse duration Tp≤ mT, wherein (0,1) m ∈, is divided into d sections for y (t), finds out every section of maximum value Form vector pmax, take pmaxIn minimum value pmax, clipping or extinguishing thresholding are pthreshold=λ pmax, λ >=1, then clipping result For
Wherein θ is original signal sampled point phase.
Extinguishing result is
Step 2: noise reduction process is carried out to guide symbol.
The channel coefficients estimated value of OFDM subcarrier, is obtained where receiver obtains guide symbol by known guide symbol Obtain the estimated value of frequency domain channel matrix HTo the estimated value of p-th of symbolIFFT is to convert to obtain g [n]:
Wherein k is sub-carrier indices, and n is time domain sampling point index, and N is OFDM symbol total number of sub-carriers.
Pass through maximum multipath time delay τmaxWith sampling time TsCalculate the preceding l diameter comprising main energetic:
L before taking to g [n], and zero padding is to N, then is FFT to treated g [n] and obtainsBecause of data OFDM symbol there are high frequency zero setting subcarrier,The coefficient and DC coefficient of medium-high frequency zero setting sub-carrier positions can neglect Slightly, remaining coefficient is usable levels.
Step 3: estimation interference and noise power.
If the data symbol that k-th of received over subcarriers of d-th of OFDM symbol arrives is Yd[k], d=1,2 ..., m.This The corresponding channel estimate matrix of all subcarriers of m OFDM symbol is
WhereinFor the channel estimation of k-th of sub-carrier positions of d-th of OFDM symbol.
The general power of interference plus noise is calculated each OFDM symbol respectively using high frequency zero setting subcarrier:
Wherein NzeroIt is high frequency zero setting subcarrier number, unused_index is high frequency zero setting sub-carrier indices.
Step 4: modified soft demodulation.
Receiver is after carrying out OFDM reception, frequency-domain received signal are as follows:
Yd[i]=Hd[i]Xd[i]+Wd[i]+Jd[i], i=1,2 ..., N；D=1 ..., m (9)
Wherein Xd[i] indicates modulated signal on i-th of subcarrier of d-th of OFDM, the corresponding one group of ratio of the modulated signal Special sequenceWherein 2MFor order of modulation,It indicates k-th that the modulation symbol represents Bit；Wd[i] is that i-th of subcarrier upside deviation of d-th of OFDM is σ2Additive white Gaussian noise, J [i] is that time domain impulse is dry Disturb the influence on i-th of subcarrier of d-th of OFDM.
For bitLog-likelihood calculations are as follows:
WhereinIndicate that k-th of bit is 1 modulation symbol set,Indicate that k-th of bit is 0 modulation symbol collection It closes, α is modulated signal.It is represented by after abbreviation
The soft bit information of acquisition, which is sent into deinterleaver and decoder, can recover transmission bit information.
The invention has the benefit that
Receiving signal time domain clipping or extinguishing can be effectively reduced stronger impulse disturbances after being FFT, to all Subcarrier extends influence, so that the bit error rate corresponding to error floor is lower.
Inter-sub-carrier interference (ICI), this portion can be introduced due to the presence of fading channel for the signal received every time Noise can be regarded as by dividing, and the present invention is not have the characteristics of data-signal using high frequency zero setting subcarrier, directly does IFFT/FFT fortune It calculates, carries out noise reduction process, compared to calculating channelSimpler, wherein D is Np×LtMatrix and D (i :)=F (ni,:),1≤i≤Np,The case where being the LS estimation of guide symbol, and avoiding the occurrence of singular matrix.
Since there are time domain impulse disturbances for channel, can all there be interference on the entire frequency band of frequency domain, at this moment simple rely on is entangled Miscoding cannot obtain desired performance, although and use interference can be reduced to the method that interference sections zoom in and out, Soft demodulation performance is still undesirable, and this interference is regarded as equivalent noise by the present invention together with noise, calculates the flat of equivalent noise Equal power improves system performance to replace the noise variance in soft demodulation.
Detailed description of the invention
Fig. 1 is flow chart of the method for the present invention；
Fig. 2 is simulation result schematic diagram.
Specific embodiment
The present invention will be described in detail with reference to the accompanying drawings and examples, so that those skilled in the art can be more preferable Ground understands the present invention.
Embodiment
The present embodiment carries out running experiment using Matlab2014a emulation platform.Ofdm system parameter: subcarrier N= 512, it is encoded using the turbo of 1/3 rate, each code block includes 4096 source bits, and 675 code blocks carry out random interleaving, Waveform frame duration 4.2012ms.
Wireless channel environment is that Doppler frequency shift is fd=150Hz and maximum multipath time delay τmaxThe three diameter channel moulds of=5us Type, Rice factor (direct projection diameter and reflection diameter ratio) be 20, channel width W=22.5MHz, baseband sampling frequency 22.5MHz, Pulse JSR=10dB, pulse period 25ms, duty ratio 1/8.Implementation steps are as follows, and wherein step 1 is in the feelings for considering complexity It can also be omitted under condition.
Step 1: extinguishing processing being carried out to time-domain received signal, signal will be received and be divided into 10 sections, calculate each section of amplitude Maximum value, take wherein the smallest one calculate pthreshold, each waveform frame is by pthresholdCarry out extinguishing processing.
Step 2: frequency domain channel matrixVector g is obtained by formula (5), to g to measuring the simultaneously zero padding of preceding 113 data To N point, then it is FFT and obtains
Step 3: estimation interference and noise power P are calculated by high frequency zero setting subcarrierjam_noise。
Step 4: calculating log-likelihood ratio according to formula (11)Obtain the estimation logarithm to k-th of coded-bit Likelihood ratio, transmission bit information can be recovered by being sent into deinterleaver and decoder.From Fig. 2 result it is found that by the present invention Promote disturb processing BER performance will significantly better than the scheme of Error Correction of Coding is only relied on, since the pulse duration is longer, wherein The performance for only extinguishing processing is unable to satisfy performance requirement, on the basis of extinguishing processing, adds noise power estimation and corrects soft Demodulation parameter can significantly improve error rate of system performance；In the case where considering system complexity, Time Domain Processing step is omitted Suddenly, retain noise reduction and correct the frequency domain technique of soft demodulation parameter, can also improve bit error rate performance, but bit error rate leveling is earlier Occur；The curve performance that time-domain processing method and frequency domain technique are combined is best.

Claims (2)

1. a kind of anti-time domain impulse of coded OFDM systems interferes method of reseptance, which comprises the following steps:
S1, noise reduction is carried out to the LS estimation of OFDM frequency domain channel coefficients:
When OFDM data symbol is there are when high frequency zero setting subcarrier, channel coefficients frequency domain LS is estimatedNoise reduction is carried out,For The estimated value of frequency domain channel matrix H, p refers to p-th of symbol, rightIFFT is to convert to obtain g [n]:
Wherein, k is sub-carrier indices, and n is time domain sampling point index, and N is OFDM symbol total number of sub-carriers；
Pass through maximum multipath time delay τmaxWith sampling time TsCalculate the preceding l diameter comprising main energetic:
L diameter before being taken to g [n], and zero padding is to length N, then is FFT to treated g [n] and obtains
S2, estimation interference and noise power:
If the data symbol that receiver receives is Yd[k], d=1,2 ..., m, d refer to d-th of OFDM symbol, and m is total OFDM symbol number calculates using high frequency zero setting subcarrier each data symbol the general power of interference plus noise respectively:
Wherein NzeroIt is high frequency zero setting subcarrier number, unused_index is high frequency zero setting sub-carrier indices；
S3, modified soft demodulation:
By noise variance σ2Use Pjam_noiseThe frequency domain channel coefficients of replacement, distinct symbols are usedReplacement, i.e.,
Wherein, whereinIndicate that k-th of bit is 1 modulation symbol set,Indicate that k-th of bit is 0 modulation symbol collection It closes, α is modulated signal；
The soft bit information of acquisition, which is sent into deinterleaver and decoder, can recover transmission bit information.
2. a kind of anti-time domain impulse of coded OFDM systems according to claim 1 interferes method of reseptance, which is characterized in that Before step S1, further includes:
Clipping or extinguishing processing are carried out to time-domain signal:
To machine time-domain received signal y (t) is received, the larger amplitude angle value p of not disturbed part is found by being segmentedmin, i.e., will be by y (t) D sections are divided into, every section of maximum value composition vector p is found outmax, take pmaxIn minimum value pmin, thresholding is set as pthreshold=λ pminCarry out clipping or extinguishing processing, λ >=1.
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CN117714245B (en) * 2024-02-06 2024-04-26 山东浪潮数据库技术有限公司 Interference suppression system, method, equipment and medium in wireless ad hoc network system

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