CN108712234A - A kind of frequency deviation detection method under the interlacing multi-address technology of combination coordinate descent - Google Patents

A kind of frequency deviation detection method under the interlacing multi-address technology of combination coordinate descent Download PDF

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CN108712234A
CN108712234A CN201810501444.1A CN201810501444A CN108712234A CN 108712234 A CN108712234 A CN 108712234A CN 201810501444 A CN201810501444 A CN 201810501444A CN 108712234 A CN108712234 A CN 108712234A
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frequency deviation
ofdm
idma
iteration
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CN108712234B (en
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何燃燃
肖悦
康洁思
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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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/391—Modelling the propagation channel
    • 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
    • H04L1/0047—Decoding adapted to other signal detection operation
    • H04L1/005—Iterative decoding, including iteration between signal detection and decoding operation
    • 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
    • H04L27/2626—Arrangements specific to the transmitter only
    • H04L27/2627—Modulators
    • H04L27/2628—Inverse Fourier transform modulators, e.g. inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators
    • 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
    • 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
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2668—Details of algorithms
    • H04L27/2669—Details of algorithms characterised by the domain of operation
    • H04L27/2671—Time domain
    • 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
    • H04L27/2697—Multicarrier modulation systems in combination with other modulation techniques

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Discrete Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Electromagnetism (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention belongs to wireless communication technology fields, and in particular to a kind of frequency deviation detection method based on interlacing multi-address technology.Since orthogonal frequency division multiplexing (OFDM-IDMA) system based on interlacing multi-address will suffer from by the influence of multiple frequency deviations caused by Doppler frequency shift or sending and receiving end crystal oscillator precision difference, and frequency deviation suppressing method traditional in orthogonal frequency division multiplexing (OFDM) system can not be suitable for OFDM-IDMA systems, therefore need to study the inclined suppressing method of multifrequency in OFDM-IDMA systems.The method of the present invention is to decline (CDM) frequency deviation detection algorithm using a kind of coordinate in OFDM-IDMA systems to inhibit frequency deviation.After carrying out frequency deviation detection, promoted.

Description

A kind of frequency deviation detection method under the interlacing multi-address technology of combination coordinate descent
Technical field
The invention belongs to wireless communication technology fields, and in particular to a kind of frequency deviation detection side based on interlacing multi-address technology Method.The present invention relates to based on orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM interlacing multi-address technology (Interleave-Division Multiple Access, IDMA) and coordinate) declines (Coordinate Descent Method, CDM) frequency deviation detection algorithm.
Background technology
Multiple access technique is the basis for constituting wireless communication networks, it is also one of the mark that wireless communication updates. How multiple access technology refers to whole resources (time, frequency and space) of all user allocation systems in cell, more to realize A user accesses shared channel and carries out while communicating.In order to adapt to the wireless network application demand of rapid growth, magnanimity is supported to set Standby connection, reaches higher spectrum efficiency, the channel capacity of faster data rate and bigger, novel multiple access technique at One of the hot spot of next generation mobile communication system 5G network research.
Hand over point multiplexing (Interleave Division Multiplexing, IDM) technology using different interleavers come Different data flows is distinguished, it is suggested as a kind of multi-access mode earliest, i.e. interlacing multi-address (Interleave-Division Multiple Access, IDMA) basic thought of IDMA is to distribute unique interleaver to each user, pass through different friendships Device is knitted to distinguish user, and divides multiple access (Code-Division Multiple Access, CDMA) using expansion different from conventional code Frequency code distinguishes user.When the interleaver random independent of all users generates, chip sequence by intertexture almost not phase It closes.IDMA inherits many merits of CDMA, such as diversity is anti-fading, the interference elimination of minizone, dynamic channel are shared.Together When, the channel coding due to IDMA by entire apread spectrum bandwidth for low bit- rate, so as to maximize coding gain and obtain ratio The higher spectrum efficiencies of CDMA.In addition, the performance of IDMA is better than CDMA, and the iteration detection method with low complex degree.IDMA The receiver of system generally uses the iteration multi-subscriber test method of low complex degree, such as traditional cell signal estimator (Elementary Signal Estimator,ESE)。
Orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) technology is Play important role in four Generation Mobile Communication Systems.Since OFDM technology has the higher availability of frequency spectrum and overcomes frequency The ability of Selective intensity.In order to reduce the complexity detected in multipath channel and overcome frequency selective fading, IDMA can be with Combined with OFDM, i.e., orthogonal frequency division multiplexing (OFDM-IDMA) technology based on interlacing multi-address, with reach bigger handling capacity and can By property.
Since OFDM-IDMA systems will suffer from by multiple frequencies caused by Doppler frequency shift or sending and receiving end crystal oscillator precision difference Inclined influence, and frequency deviation suppressing method traditional in ofdm system can not be suitable for OFDM-IDMA systems, therefore need to study The inclined suppressing method of multifrequency in OFDM-IDMA systems.Technical solution of the present invention propose it is a kind of based on OFDM-IDMA technologies one Kind CDM frequency deviation detection algorithms.
Invention content
It is an object of the present invention to propose a kind of frequency deviation detection algorithm suitable under OFDM-IDMA systems.
The transmitter architecture of upgoing O FDM-IDMA systems is as shown in Figure 1, wherein include K user.For k-th of user, Data sequence d firstkCarry out Low Bit-rate Coding, including two steps of FEC codings and spread spectrum；Then encoded codeword sequence ck Into the specific chip-level interleaver pi of the userk, generate the chip sequence x after intertexturek, to complete the parts IDMA in transmitter Processing.It is followed later by inverse fast fourier transform (Inverse Fast Fourier Transform, IFFT) and insertion Ring prefix converts the signal into time domain, and the time-domain signal of k-th of user is represented by
Wherein, N indicates total number of sub-carriers, NgIndicate the length of cyclic prefix.
The receiver structure of OFDM-IDMA systems is as shown in Figure 2.It receives signal and carries out cyclic prefix and Fourier first It converts (Fast Fourier Transform, FFT), time-domain received signal is transformed into frequency domain, then be iterated multi-user's letter Number detection.
Time-domain received signal from all users is represented by,
Wherein,Indicate convolution algorithm, hk(u) the time domain impulse response at u-th of moment of k-th of user is indicated.W is mean value For 0, variance σ2White Gaussian noise (Additive White Gaussian Noise, AWGN).
In actual OFDM-IDMA systems, due to the difference of sending and receiving end crystal oscillator precision and the influence of Doppler frequency shift, Receiver will be influenced by the carrier frequency offset from different user, as shown in figure 3, by multidiameter fading channel it Afterwards, become by the time-domain received signal that multifrequency influences partially：
Wherein, εkIndicate the normalization frequency deviation value of k-th of user, hjkIt indicates between jth root reception antenna and k-th of user Channel time domain impulse response.wnIt is AWGN.
By time-domain received signal rj,CFO(u) it removes CP, then switch to frequency domain, be represented by
Wherein Si(k) frequency offset factor for indicating k-th of user on n-th of subcarrier, can be represented by the formula：
A kind of detection method for inhibiting multifrequency inclined in upgoing O FDM-IDMA systems is presented below.This method is first Single user frequency deviation correcting method is respectively adopted to each user in time domain slightly to be synchronized, to inhibit each user frequency deviation of itself； Then it by the reception signal of each user by FFT transform to frequency domain, is finally gone using a kind of iterative interference cancellation method in frequency domain Inhibit the residual frequency departure of other users, and detects the signal of each user.
After overdeviation offset, the signal on jth root n-th of subcarrier of reception antenna can be expressed as：
WhereinIt indicates the residual frequency departure factor after CFO is compensated, can be formulated as：
The technical scheme is that：
CDM detectors and IDMA systems are organically combined, modulated according to M-PSK or M-QAM, B indicates reception antenna number, U indicates that number of users, the information of the μ user can be expressed asSo CDM algorithms include the following steps：
S1, setting IDMA systematic parameters, including assignment is carried out to number of users U and antenna number B, it is arranged what each user used Number of constellation points is M and setting maximum iteration tmax；
S2, initialization：We first assume that probability when the 1st iteration isWhereinWe assume that the amplitude of each subscriber signal is initialized as 1, initialisation phase 0, i.e.,
S3, the update of inbound message iteration judge t whether beyond the maximum iteration set in step S1, if t≤tmax, S4 is then entered step, if t>tmax, then termination messages iteration updates and enters step S8, and judges whether μ sets beyond step S1 The number of users set enters step S4 if μ≤U, if μ >U then terminates the update of user message and enters step S7；
S4, the update for carrying out user's amplitude and phase, specially；
S41, the frequency deviation residual factor is calculated
Wherein, εμIndicate that the frequency deviation value of the μ user, N are the data length of each user, the optimal compensation value ε0For
S42, the amplitude and phase that the μ subscriber signal is updated with following two formula
Wherein, HbμIndicate channel matrix H ∈ CB×U(b, μ) a element, SbμIndicate S ∈ CB×U(b, μ) a member Element, ybIndicate the signal vector y ∈ C that receiving terminal receivesB×1B-th of element.
S5, the signal that the μ user is estimated with following formula：
S6, number of users μ is set to μ+1, returns to S2, until the signal update of U user is completed
S7, t is set to t+1, returns to S2, until iterative cycles are completed
S8, updated probability distribution, completion Multiuser Detection, to user's progress soft-decision output are utilized.
Description of the drawings
Fig. 1 is the basic model of OFDM-IDMA system transmitters；
Fig. 2 is the basic model of OFDM-IDMA system receivers；
Fig. 3 is the OFDM-IDMA system structures influenced partially by multifrequency；
Fig. 4 is that single-shot four receives the interlacing multi-address system CDM detections based on orthogonal frequency division multiplexing using 2 users of QPSK modulation The frequency deviation of method inhibits contrast simulation figure；
Specific implementation mode
With reference to the accompanying drawings and examples, detailed description of the present invention technical solution：
The present embodiment is tested using Matlab emulation platforms.
The purpose of this example is achieved by the steps of：
S1, IDMA simulation parameters are set, systematic parameter is as follows in this example：Number of users U=2, reception antenna number B=4, iteration Number tmax=5, it is modulated using QPSK, i.e. M=4, for coding using 1/6 turbo codes, simulated channel is TDL-C channels；
S2, the primary data for generating two groups of group users, are encoded, are interweaved successively respectively, are carried out after carrying out QPSK modulation Inverse Fast Fourier Transforms；
S3, it crosses after channel to signal addition frequency deviation, and white Gaussian noise is added, carry out Fast Fourier Transform (FFT) feeding later Receiving terminal；
S4, in receiving terminal, 4 tunnels are received after the data on antenna do maximum-ratio combing, to carry out the frequency deviation inspection based on CDM It surveys, deinterleave, despreading and decoding completes iterative cycles；
S5, by the recovery data after detection, obtain BER with primary data comparison statistics.
Can be obtained according to Fig. 4, by simulation result it is found that OFDM-IDMA-CDM systems because frequency deviation presence, performance has dropped About 5dB, and after test side carries out frequency deviation compensation detection, system performance is promoted.

Claims (1)

1. the frequency deviation detection method under a kind of interlacing multi-address technology of combination coordinate descent, which is characterized in that including following step Suddenly：
S1, setting IDMA systematic parameters：
It is modulated using M-PSK or M-QAM, reception antenna number is B, number of users U, and the information of the μ user is expressed as
Assignment is carried out to number of users U and antenna number B, the number of constellation points that each user uses is set for M and setting greatest iteration Number tmax；
S2, initialization：Assuming that probability when the 1st iteration isWherein
Assume that the amplitude of each subscriber signal is initialized as 1 simultaneously, initialisation phase 0, i.e.,
S3, the update of inbound message iteration judge t whether beyond the maximum iteration set in step S1, if t≤tmax, then into Enter step S4, if t>tmax, then whether termination messages iteration updates and enters step S8, and judge μ beyond step S1 settings Number of users enters step S4 if μ≤U, if μ >U then terminates the update of user message and enters step S7；
S4, the update for carrying out user's amplitude and phase, specially：
S41, the frequency deviation residual factor is calculated
Wherein, εμIndicate that the frequency deviation value of the μ user, N are the data length of each user, the optimal compensation value ε0For
S42, the amplitude and phase that the μ subscriber signal is updated with following two formula：
Wherein, HbμIndicate channel matrix H ∈ CB×U(b, μ) a element, SbμIndicate S ∈ CB×U(b, μ) a element, yb Indicate the signal vector y ∈ C that receiving terminal receivesB×1B-th of element；
S5, the signal that the μ user is estimated with following formula：
S6, number of users μ is set to μ+1, returns to S2, until the signal update of U user is completed；
S7, t is set to t+1, returns to S2, until iterative cycles are completed；
S8, updated probability distribution, completion Multiuser Detection, to user's progress soft-decision output are utilized.
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