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Doppler estimation method of MIMO-OFDM hydroacoustic communication system

A MIMO-OFDM and Doppler estimation technology, applied in the field of underwater acoustic communication, can solve complex problems, and achieve the effects of improving multiplexing degree, improving estimation accuracy, and reducing implementation complexity

Inactive Publication Date: 2016-04-13
JIANGSU UNIV OF SCI & TECH
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Problems solved by technology

The Doppler estimation method in the MIMO-OFDM system is much more complicated than the Doppler estimation method in the single-input-output underwater acoustic communication system

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  • Doppler estimation method of MIMO-OFDM hydroacoustic communication system
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  • Doppler estimation method of MIMO-OFDM hydroacoustic communication system

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Embodiment Construction

[0041] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings;

[0042] In order to facilitate the understanding of the basic principles and specific methods of the present invention, the system model adopted by the present invention is first given.

[0043] 1. MIMO underwater acoustic channel model

[0044] The present invention is based on the following underwater acoustic channel model. Consider a N t transducers, N r An underwater acoustic MIMO-OFDM communication system with hydrophones, assuming that in the underwater acoustic sparse channel between the i-th transducer and the j-th hydrophone, the multipath attenuation is approximately constant within a symbol period , assuming that the signal transmission path sent by each transducer undergoes different amplitude attenuation, Doppler spread and delay spread in sequence, and the corresponding description parameters are the amplitude factor α p , Doppler facto...

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Abstract

The invention discloses a Doppler estimation method of a MIMO-OFDM hydroacoustic communication system. The method comprises the following steps: sampling sparse signals received at a receiving end at a sampling interval to obtain a sparse vector y; through synchronization pilot signals s(t) already known to both two receiving sides and channel features, selecting proper precision to construct an over-complete dictionary; in one period, performing accumulation on all sampling values to obtain y=Cx+n, wherein a receiving vector is seen as a linear combination of a C series taking an x element as a coefficient; receiving the sparse vector y through the over-complete dictionary C, and reconstructing signals x by use of an SBL algorithm; and finding out a corresponding column in the over-complete dictionary C corresponding to a non-zero element in the x, and accordingly finding out an equivalent Doppler factor corresponding to each path. According to the invention, the estimation precision of a MIMO-OFDM hydroacoustic Doppler factor is greatly improved, and a new solution method is also brought forward for routine Doppler spread.

Description

technical field [0001] The invention belongs to the technical field of underwater acoustic communication, in particular to a Doppler estimation method for a MIMO-OFDM underwater acoustic communication system. Background technique [0002] The underwater acoustic communication network has important application value in the remote control of the offshore oil industry, marine environment monitoring, marine scientific data collection, underwater communication, and marine resource exploration. It usually consists of subsea sensors, autonomous underwater vehicles and surface stations. The characteristics of ocean transmission channels, such as limited available frequency band, extended transmission time, and high environmental noise levels, severely limit the service quality of underwater acoustic communication networks. Therefore, the realization of high-performance and high-reliability underwater acoustic communication network has great technical challenges. The key is to study...

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Application Information

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IPC IPC(8): H04L25/02H04L27/26
CPCH04L25/0222H04L27/2628H04L27/2646H04L27/2675
Inventor 王彪丁鹭飞杨奕飞戴跃伟
Owner JIANGSU UNIV OF SCI & TECH
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