Low-complexity underwater acoustic channel estimation algorithm based on orthogonal matching pursuit

An orthogonal matching tracking, underwater acoustic channel technology, applied in baseband systems, baseband system components, digital transmission systems, etc., can solve problems such as excessive computational load

Active Publication Date: 2019-08-09
XIAMEN UNIV
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Problems solved by technology

[0012] The purpose of the present invention is to overcome the existing OMP algorithm in the search for the best matching atoms, the calculati

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  • Low-complexity underwater acoustic channel estimation algorithm based on orthogonal matching pursuit
  • Low-complexity underwater acoustic channel estimation algorithm based on orthogonal matching pursuit
  • Low-complexity underwater acoustic channel estimation algorithm based on orthogonal matching pursuit

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Embodiment Construction

[0095] In order to better understand the purpose, technical solution and beneficial effects of the present invention, the following embodiments will describe the present invention in detail with reference to the accompanying drawings.

[0096] figure 2 It is a schematic flow diagram of the method of the present invention, such as figure 2 As shown, the low-complexity OMP algorithm steps provided by the present invention are as follows:

[0097] 1) Construct a double-spread sparse channel compressed sensing model in the OFDM system, and derive the observation matrix Ψ;

[0098] Assuming that the OFDM symbol period is T and the number of subcarriers is N, then the frequency interval between adjacent subcarriers Δf=1 / T, the number of subcarriers available within the system bandwidth K=B / Δf=BT, that is, each OFDM A symbol can carry K data symbols, and the transmitted baseband OFDM signal x(t) can be expressed by formula (1).

[0099] Due to the sparsity of the underwater acou...

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Abstract

The invention discloses a low-complexity underwater acoustic channel estimation algorithm based on orthogonal matching pursuit, and relates to a low-complexity underwater acoustic channel estimation algorithm based on orthogonal matching pursuit. Firstly, ignoring a Doppler spread factor, and establishing a solution space required by a PSO algorithm on a time delay dimension; secondly, optimizingan inertia weight coefficient in a PSO algorithm, and searching a most matched atom set in a solution space, namely, an initially estimated path delay set; thirdly, expanding the initially estimated path delay set, and establishing a solution space required by the PSO algorithm again in combination with a Doppler spread factor; and finally, searching the most matched atom set by adopting a PSO algorithm to obtain an underwater acoustic channel impulse response estimation value. An inner product storage index table is established in the process of searching the most matched atoms twice, so thatrepeated calculation of the inner product is avoided, and the searching speed is increased. On the basis of an existing OMP algorithm, a two-step estimation method is adopted, the number of times ofinner product calculation can be reduced, and the complexity of the existing OMP algorithm is effectively reduced.

Description

technical field [0001] The present invention relates to a low-complexity underwater acoustic channel estimation algorithm based on Orthogonal Matching Pursuit (OMP, Orthogonal Matching Pursuit), in particular to an underwater acoustic Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) communication system. A Low Complexity Underwater Acoustic Channel Estimation Algorithm Based on Orthogonal Matching Pursuit. Background technique [0002] In recent years, underwater acoustic communication has received extensive attention and research. However, the severe multipath spread and Doppler effect of underwater acoustic channels limit the performance of underwater acoustic communication. Due to the difference in signal propagation speed, the Doppler effect of terrestrial wireless communication can be approximated as Doppler frequency shift, while the underwater acoustic channel presents broadband characteristics, and the Doppler frequency sh...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L27/38H04L25/02
CPCH04L25/0222H04L27/2695H04L27/3854
Inventor 王德清谢沁伶付立群徐景鑫胡晓毅岳蕾
Owner XIAMEN UNIV
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