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Channel estimation method for sparse property of underwater acoustic block structure

A technology of channel estimation and sparse characteristics, which is applied in the field of underwater acoustic channels with sparse multipath and block-like distribution, and can solve the problem that the channel response cannot be accurately estimated.

Inactive Publication Date: 2016-10-12
JIANGSU UNIV OF SCI & TECH
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Problems solved by technology

Since the sparse channel has only a few non-zero taps, the traditional channel estimation method cannot accurately estimate the channel response when the channel is sampled to zero taps

Method used

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  • Channel estimation method for sparse property of underwater acoustic block structure
  • Channel estimation method for sparse property of underwater acoustic block structure
  • Channel estimation method for sparse property of underwater acoustic block structure

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Embodiment Construction

[0040] The technical solutions and beneficial effects of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0041] The present invention provides a channel estimation method for the sparse characteristics of the underwater acoustic block structure. According to the characteristics of the underwater acoustic channel, on the basis of standard compressed sensing channel estimation, the internal structure of the sparse signal is further considered, and the sparse signal is effectively divided into blocks. Reduce the sparsity of the signal, especially suitable for channels with sparse structures such as underwater sound.

[0042] The following first introduces the mathematical model of OFDM and underwater acoustic channel and the relevant information of the received signal.

[0043] 1. OFDM mathematical model

[0044] Let the number of OFDM subcarriers be N, and the frequency of the nth subcarrier be f n = f c+nΔf, where Δf=1...

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Abstract

The invention discloses a channel estimation method for the sparse characteristic of underwater acoustic block structure, which includes three modules: an OFDM system overall working module; a block orthogonal matching tracking algorithm flow module; and a block sparse compressed sensing channel estimation module. This channel estimation method can effectively reduce signal sparsity, thereby reducing the number of pilots required for estimation, greatly reducing the time required for algorithm estimation, and improving the accuracy of reconstruction.

Description

technical field [0001] The invention belongs to the field of underwater acoustic communication, and relates to a channel estimation method with a block sparse structure in an OFDM underwater acoustic communication system, and is particularly suitable for an underwater acoustic channel with sparse multipath distributed in a block shape. Background technique [0002] With more and more frequent activities in the ocean, people have higher and higher requirements on the speed of underwater acoustic communication. Orthogonal Frequency Division Multiplexing (OFDM) has become the preferred technology for high-speed underwater acoustic communication due to its high frequency band utilization and low complexity. However, OFDM is sensitive to timing and frequency offset, and Doppler frequency shift will generate frequency synchronization error and cause inter-carrier interference. In the design of underwater acoustic OFDM system receivers, it is often necessary to know the channel st...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L25/02
CPCH04L27/2695H04L25/0224
Inventor 王彪朱芹
Owner JIANGSU UNIV OF SCI & TECH
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