Multi-carrier underwater acoustic communication method applied to deep-sea channel

An underwater acoustic communication and multi-carrier technology, which is applied in the modulation carrier system, multi-frequency code system, transmission monitoring, etc., can solve the problem of low transmission rate

Inactive Publication Date: 2018-08-21
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Direct sequence spread spectrum technology has strong anti-interference performance, but its transmission rate is low

Method used

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  • Multi-carrier underwater acoustic communication method applied to deep-sea channel
  • Multi-carrier underwater acoustic communication method applied to deep-sea channel
  • Multi-carrier underwater acoustic communication method applied to deep-sea channel

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Embodiment Construction

[0057] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0058] Step 1: In the present invention, the ocean is divided into a surface isothermal layer, a thermocline and a deep-sea isothermal layer, the surface isothermal layer and the deep-sea isothermal layer are positive sonic gradient water layers, and the thermocline is a negative sonic gradient water layer, wherein the surface isothermal The layer is the depth of 0-100 meters in the ocean, the thermocline is the depth of 100-300 meters, and the deep-sea isothermal layer is the depth below 300 meters. The sea depth is taken as H, and the sound source is placed at the depth h. The change of H, the negative gradient of sound velocity and the positive gradient of sound velocity on the upper and lower sides of the channel axis respectively, the horizontal transmission distance is s, the track of the sound ray bends when propagating, the sound ray path only tr...

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Abstract

The invention provides a multi-carrier underwater acoustic communication method applied to a deep-sea channel, related to the field of underwater acoustic communication. According to the invention, atwo-path channel model which is transmitted in a convergence zone is established through calculating parameters such as the amplitude attenuation coefficient caused by wave surface extension and the amplitude attenuation coefficient caused by acoustic absorption when the acoustic wave is propagated in the ocean, and a two-path channel model is established for transmission in a convergence zone andis used for communication simulation; the two-path model of the deep-sea underwater acoustic channel established by the invention not only simplifies the channel model, but also truly reflects the characteristics of the underwater acoustic channel; through performing MC-DS-CDMA system simulation, the experimental results are shown in the harsh underwater acoustic channel environment; the systemhas good characteristics and can realize more stable communication; the transmission efficiency of the system is high, and the bit error rate meets the needs of practical engineering application, therefore, the system can be applied in practice.

Description

technical field [0001] The invention relates to the field of underwater acoustic communication, in particular to an underwater acoustic communication method suitable for deep sea channels. Background technique [0002] As the development of marine resources has received more and more attention from governments in recent years, the application demand for underwater acoustic communication has continued to increase. The attenuation of high-frequency signals by the ocean medium is serious, resulting in a narrow transmission bandwidth; the transmission speed of sound waves in the ocean is slow, and the relative movement of the transceiver leads to a large Doppler frequency deviation of the received signal. The complex and changeable marine environment leads to the characteristics of time-varying, space-varying, strong multipath interference, Doppler and other characteristics of underwater acoustic channels. All of these have brought great challenges to underwater communication d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B13/02H04L27/26H04B17/391H04B1/707
CPCH04B1/707H04B13/02H04L27/2601H04B17/3912
Inventor 樊养余展海玲吕国云王剑书王敏庆刘洋王菲
Owner NORTHWESTERN POLYTECHNICAL UNIV
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