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Underwater acoustic sparse channel estimation method, system and device and storage medium

A sparse channel and underwater acoustic channel technology, applied in channel estimation, baseband system, transmission system, etc., can solve problems such as long delay and sparse multipath

Active Publication Date: 2019-10-08
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of sparse multipath, long delay, and non-Gaussian channel estimation in underwater acoustic communication, and proposes a joint iterative estimation method for sparse channels based on DGAMP and MP

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  • Underwater acoustic sparse channel estimation method, system and device and storage medium
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  • Underwater acoustic sparse channel estimation method, system and device and storage medium

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Embodiment 1

[0065] The purpose of the present invention is to design a sparse channel joint iterative estimation method for underwater acoustic multi-carrier transmission. Iteratively implements sparse estimation of the channel.

[0066] Such as figure 1 As shown, in the OFDM system model, binary data is input at the input terminal, serial-to-parallel conversion is performed after multi-ary modulation, pilot symbols are inserted on subcarriers of a specific frequency, and IFFT operation is performed to convert the frequency domain signal into time domain Signal. In order to avoid intersymbol interference (ISI) caused by multipath, a certain length of cyclic prefix (CP) is added before OFDM symbols, and then sent to multipath channels through parallel-to-serial conversion. At the receiving end, after serial-to-parallel conversion, cyclic prefix removal, and FFT, the received signal is used for channel estimation by pilot frequency, channel influence is removed, and symbol detection is pe...

Embodiment 2

[0107] Embodiment 2 of the present invention provides an underwater acoustic sparse channel estimation system, the system comprising:

[0108] An underwater acoustic channel estimation model building module, used to establish an underwater acoustic channel estimation model; and

[0109] The underwater acoustic channel estimation module is used to determine the sparse support set of the underwater acoustic channel through the matching pursuit algorithm, and then realize the joint iterative sparse estimation of the channel based on the damped generalized approximate message passing algorithm in the sparse support set.

Embodiment 3

[0111] Embodiment 3 of the present invention provides a computer device, including a memory, a processor, and a computer program stored on the memory and operable on the processor. When the processor executes the computer program, the computer program is implemented. Example 1 method.

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Abstract

The invention provides an underwater acoustic sparse channel estimation method, system and device and a storage medium. The method comprises: establishing an underwater acoustic channel estimation model; and determining a sparse support set of the underwater acoustic channel through a matching pursuit algorithm, and then realizing joint iteration sparse estimation of the channel in the sparse support set based on a damping generalized approximate message transfer algorithm. According to the invention, a matching pursuit MP algorithm and a DGAMP algorithm are organically combined, a sparse channel joint iteration estimation method is provided, on one hand, a support set of sparse points is determined through MP iteration, the number of nodes of a DGAMP factor is reduced, the convergence ofthe DGAMP is ensured, and the robustness of the DGAMP factor is greatly improved; and on the other hand, DGAMP iterative estimation is adopted in the support set to obtain the estimation value of thechannel, and the iteration process only involves scalar operation, so that the calculation complexity is greatly reduced.

Description

technical field [0001] The present invention relates to an underwater acoustic sparse channel estimation method, in particular to a sparse channel joint iterative estimation method for underwater acoustic multi-carrier transmission, in particular to an underwater acoustic sparse channel estimation method, system, device and storage medium. Background technique [0002] The underwater acoustic channel is a long-delay multipath channel, and the multipath effect is particularly obvious for horizontal transmission channels. The long-delay multipath effect has two main effects on underwater acoustic communication signals: it introduces strong inter-symbol interference in the time domain; it brings serious frequency selectivity in the frequency domain. Therefore, in order to accurately recover the transmitted symbols and bits, the receiving end of the underwater acoustic communication system needs to make full use of the information of the underwater acoustic channel. [0003] Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L27/26
CPCH04L25/0202H04L25/024H04L25/0242H04L27/261
Inventor 李栋房小芳朱敏武岩波
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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