Method for estimating underwater acoustic channel impulse response function in multipath environment

An impulse response, underwater acoustic channel technology, applied in the fields of underwater acoustics and underwater acoustic signal processing, can solve the problem of low estimation accuracy of underwater acoustic channel, and achieve the effect of optimizing sparse signal recovery, less requirements, and effective estimation

Active Publication Date: 2017-11-24
NORTHWESTERN POLYTECHNICAL UNIV
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[0004] In order to avoid the deficiencies of the prior art, the present invention proposes a method for estimating the impulse response function of the underw...

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  • Method for estimating underwater acoustic channel impulse response function in multipath environment
  • Method for estimating underwater acoustic channel impulse response function in multipath environment
  • Method for estimating underwater acoustic channel impulse response function in multipath environment

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[0072] The present invention will now be further described with reference to the drawings. Reference figure 1 BPSK signal (binary phase shift keying, BPSK) is used as the transmitting signal, the number of taps of the underwater acoustic channel is 100, and the position and size conform to the Gaussian law of zero mean unit variance. The OSNR of the received signal is defined as

[0073]

[0074] figure 1 The parameters are set as follows: OSNR=15dB, M=L=100, the sparsity is increased from 3 to 30, the change step is 3, from figure 1 It can be seen that when the sparsity is greater than 3, the performance of GSMP is much better than the other two classic algorithms. This is because GSMP uses precision to reduce residuals, avoids redundant iterative calculations and effectively implements sparsity constraints.

[0075] Considering that the shorter the training sequence in practical applications, the more beneficial it is to acquire and capture the time delay and amplitude attenua...

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Abstract

The invention relates to a method for estimating an underwater acoustic channel impulse response function in a multipath environment. Matching pursuit is improved by using a Schmidt orthogonalization strategy, so that the residual can be reduced on the orthogonalization direction by each step of iteration in a solving process so as to avoid redundant calculation. According to the method provided by the invention, a Schmidt orthogonalization process is imported in a matching pursuit iteration strategy for the first time, a convolution matrix is constructed via probe signals or training sequences, matching selection is performed on the convolution matrix by using Schmidt orthogonalization, and the matching intensity in every matching operation of the convolution matrix is arranged in sequence to construct a dictionary; and an estimation result of underwater acoustic channel is obtained by pseudo inverse operation. Therefore, delay and amplitude attenuation parameters are obtained.

Description

Technical field [0001] The invention belongs to an underwater acoustic channel estimation method, relates to a method for estimating the impulse response function of an underwater acoustic channel in a multi-path environment, and is suitable for marine underwater acoustic communication, seabed topography, landform survey, and seabed parameter inversion And other content, belong to the field of hydroacoustics and hydroacoustic signal processing. Background technique [0002] In order to remove multipath influences, the present invention uses received signals and known probe signals for periodic training to estimate the underwater acoustic channel impulse response function, including time delay and amplitude attenuation parameters. At present, the methods of using periodic training modes to estimate the impulse response function of underwater acoustic channels mainly include Matching Filter (MF), Least Square (LS) and Matching Pursuit (Matching Pursuit). ,MP). Among them, the mat...

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Application Information

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IPC IPC(8): H04L25/02H04B13/02
CPCH04B13/02H04L25/0222H04L25/024H04L25/0242
Inventor 伍飞云杨坤德孙权薛润泽张宇坤
Owner NORTHWESTERN POLYTECHNICAL UNIV
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