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A method and system for underwater acoustic channel estimation based on msaswomp algorithm

An underwater acoustic channel and algorithm technology, applied in baseband system components, transmission systems, electrical components, etc., can solve the problem of consuming a lot of pilot resources, and achieve the effect of improving channel estimation performance and achieving accurate reconstruction.

Active Publication Date: 2021-06-11
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

[0005] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides an underwater acoustic channel estimation method based on the MSASWOMP algorithm, which solves the problem of consuming too many pilot resources, and simultaneously the present invention also provides a method based on the MSASWOMP algorithm. Underwater Acoustic Channel Estimation System

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  • A method and system for underwater acoustic channel estimation based on msaswomp algorithm
  • A method and system for underwater acoustic channel estimation based on msaswomp algorithm
  • A method and system for underwater acoustic channel estimation based on msaswomp algorithm

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Embodiment 1

[0046] The present invention provides a kind of algorithm flowchart of the underwater acoustic channel estimation based on MSASWOMP algorithm, the MSASWOMP algorithm that this method uses is the improvement to MSAMP algorithm, specifically as follows, as figure 1 Shown:

[0047] Step 1, such as figure 2 To establish an underwater acoustic OFDM system, assuming that all subcarriers are orthogonal, that is, there is no inter-carrier interference (ICI), the data symbols X of N subcarriers can be expressed in matrix form, and the data carrier positions are set to zero.

[0048]

[0049] Wherein, X[i] represents the pilot signal on the i-th subcarrier, i=0,1,2,...,N-1.

[0050] After passing through the underwater acoustic channel, do Fourier transform to get the received pilot signal Y:

[0051]

[0052] Among them, H is the frequency domain matrix of the underwater acoustic channel, which is the Fourier transform of the impulse response h of the underwater acoustic chann...

Embodiment 2

[0071] On the other hand, the present invention also provides a kind of underwater acoustic channel estimation system based on MSASWOMP algorithm, such as image 3 shown, including:

[0072] The frequency division multiplexing system building block 1 is used to construct the frequency division multiplexing system, obtain the received pilot signal Y according to the data symbols of the subcarriers, and establish the underwater acoustic channel compressive sensing equation y, including:

[0073]Pilot signal calculation unit 11 first sets up the underwater acoustic OFDM system; assuming that all subcarriers are orthogonal, that is, there is no inter-carrier interference (ICI), then the data symbol X of N subcarriers can be expressed as a matrix form, and the data carrier position Zero.

[0074]

[0075] Wherein, X[i] represents the pilot signal on the i-th subcarrier, i=0,1,2,...,N-1.

[0076] Secondly, calculate the pilot signal Y; after passing through the underwater acous...

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Abstract

The invention discloses a method for estimating an underwater acoustic channel based on the MSASWOMP algorithm, including: (1) constructing a frequency division multiplexing system, obtaining a received pilot signal Y according to the data symbols of subcarriers, and establishing an underwater acoustic channel compressed sensing equation ; (2) Add threshold weak selection to the signal residual matching of MSAMP algorithm, add backtracking screening after threshold weak selection to iteratively optimize, update the support set, and then realize the estimation of the underwater acoustic channel vector. The present invention adopts the threshold weak selection method, and adds backtracking screening after the threshold weak selection, and the atoms that pass the threshold weak selection are regarded as candidate atoms in the backtracking stage. with the initial support set K 0 , can effectively improve channel estimation performance with less pilot resources.

Description

technical field [0001] The invention relates to the field of underwater acoustic channel estimation, in particular to an underwater acoustic channel estimation method and system based on MSASWOMP algorithm. Background technique [0002] At present, to counter the multipath interference and time-varying problems of underwater acoustic channels, accurately estimate channel state information and effectively track fast-changing underwater acoustic channels has become an important task for underwater acoustic communication systems. For underwater acoustic Orthogonal Frequency Division Multiplexing (OFDM) communication, the commonly used channel estimation methods are least squares (LS) and minimum mean square error (MMSE), both of which are based on the optimal estimation of the L2 norm, and the channel is regarded as a dense channel , which cannot reflect the sparsity of the channel. The research shows that the inherent sparsity of the underwater acoustic channel is a prerequis...

Claims

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Application Information

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IPC IPC(8): H04L25/02H04B13/02
Inventor 张秀再赵慧蒋闯刘思成沈嘉程
Owner NANJING UNIV OF INFORMATION SCI & TECH
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