An underwater acoustic mimo communication method based on space-time-frequency coding and passive time-reverse reception

Abstract

The invention discloses a space-time-frequency coding and passive time reversal reception based underwater acoustic MIMO (Multiple Input Multiple Output) communication method which comprises the following steps of: 1, modulating a signal source data stream by using a new space-time-frequency code at an emitting end of a underwater acoustic MIMO communication system; 2, designing a frame structure of an emitted signal; 3, performing multi-array-element passive phase yoke time reversal treatment on a received signal and recovering information sent from each emitting array element. The space-time-frequency coding and passive time reversal reception based underwater acoustic MIMO communication method has the advantages that: as the emitting end adopts a new space-time-frequency code modulation technology, cochannel interference in the received signal can be removed completely, the decoding performance of the receiving end is not only improved efficiently, but barriers are also removed, at the same time, for performing reception by applying the time reversal technology in the underwater acoustic MIMO communication system. On the basis, the multi-array-element passive time reversal technology excluding an adjustable parameter is adopted at the receiving end to efficiently suppress intersymbol interference caused by multi-path spread and meanwhile improve SNR (Signal to Noise Ratio) of the receiving end. Therefore, the stability and the decoding performance of the system are improved obviously.

Description

technical field [0001] The invention belongs to the technical field of underwater acoustic communication, and in particular relates to a robust and high-speed underwater acoustic communication method. Background technique [0002] As a flexible and effective means of wireless transmission of underwater information, underwater acoustic communication has broad application prospects in both military and civilian fields. Especially in recent years, with the rapid development of ocean development and information industry, people's demand for high-speed underwater acoustic communication has become increasingly urgent. However, since the underwater acoustic channel is a very complex time-space frequency-varying random multipath channel, there are many unfavorable factors such as narrow bandwidth, high noise, and large fluctuations, which make it particularly difficult to achieve high-speed and reliable communication underwater, which also leads to underwater acoustic The communica...

AI Technical Summary

Problems solved by technology

Its disadvantage is that due to the presence of intersymbol interference and co-channel interference in the received signal, its decoding performance is often not ideal.

The traditional receiving technology of underwater acoustic MIMO communication system based on layered space-time coding is adaptive space-time equalization technology. The disadvantage of this technology is that it contains two user-adjustable parameters, and the algorithm is very sensitive to the selection of the two parameters. deviation, which can easily lead to equilibrium failure

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