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Frequency-domain small wave blind equalization method based on united combining space-time diversity

A frequency domain equalization and blind equalization technology, applied in the field of frequency domain wavelet blind equalization based on joint combining space-time diversity, can solve the problems of large steady-state error, large amount of calculation, slow convergence speed of single-channel orthogonal wavelet constant modulus algorithm, etc.

Inactive Publication Date: 2012-03-07
NANJING UNIV OF INFORMATION SCI & TECH
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  • Description
  • Claims
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to invent a Blind wavelet equalization method in frequency domain based on joint combining space-time diversity

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  • Frequency-domain small wave blind equalization method based on united combining space-time diversity
  • Frequency-domain small wave blind equalization method based on united combining space-time diversity
  • Frequency-domain small wave blind equalization method based on united combining space-time diversity

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Embodiment

[0063] In order to verify the effectiveness of the inventive method JCTSD-FWTCMA, a 16PSK signal is used for simulation. If M=D=2 is assumed in the simulation, two space diversity modules are contained in the instant space diversity module, and two branch modules are contained in each space diversity module. road, you need four underwater acoustic channels, respectively, c 1 =[0.9656-0.09 060.0578 0.2368] and c 2 = [0.8264-0.1653 0.1653] as the channel of the first spatial module, c 3 = [0.35 0 0 1] and c 4 =[0.2 0.5 1 -0.1] As the second space diversity module, the signal-to-noise ratio is 20dB, the weight length of the equalizer is 32 and the center tap is used for initialization, each signal is decomposed by DB2 wavelet, and the decomposition level is 2 layers , the initial power value is 4; β=0.999, the simulation step size is μ WT-CMA = 0.00155; μ FWTCMA =0.015088; In the JCTSD-FWTCMA method, the step size of the two branches of the first module is μ 1 =0.007,μ 2 =0...

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Abstract

The invention discloses a frequency-domain small wave blind equalization method based on united combining space-time diversity, comprising the following steps: firstly, realizing a single channel frequency-domain small wave blind equalization method (FWTCMA) by utilizing an FFT technique and an overlap retaining method; and secondly, constructing a united combining space-time diversity system model, wherein the united combining space-time diversity system model is characterized in that each branch path adopts different space diversity modules on the basis of time diversity; the output of combined space diversity modules is used as the input of a time diversity combiner; and a signal combined by the time diversity combiner is used as the input of a whole system. The frequency-domain small wave blind equalization method has high convergence speed, small steady state error and low computing complexity.

Description

technical field [0001] The invention relates to a wavelet blind equalization method based on joint combined space-time diversity and frequency domain, and belongs to the technical field of blind equalization algorithms for overcoming inter-symbol interference (Inter-Symbol Interference, ISI) caused by multipath fading of underwater acoustic channels. Background technique [0002] Inter-Symbol Interference (ISI) caused by multipath fading of underwater acoustic channel is a key factor affecting the efficiency of underwater data transmission. An effective means to overcome (ISI) is to use a blind equalization method that does not require a training sequence (see literature: [1] Guo Yecai, Han Yingge, Rao Wei. Blind equalization algorithms based on different error equations with exponential variable step size [C] / / The First International Symposium on Test Automation & Instrumentation (ISTAI). Xi'an, China: World Publishing Corporation, 2006: 497-501). Among many blind equaliz...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/03H04L27/26H04B7/08H04B13/02
Inventor 郭业才丁雪洁
Owner NANJING UNIV OF INFORMATION SCI & TECH
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