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Research on Time Reversal Spread Spectrum Underwater Acoustic Communication in Time-varying Channels

Abstract

随着海洋开发、海洋环境监测和海洋国防安全等领域信息化建设的快速发展,利用海洋信道进行信息传输的需求大大增加,水声通信越来越受到人们的重视。但是,水声环境的复杂性、时变性和不可确定性导致信号多普勒频移、多径效应、幅度和频率选择性衰落等问题,给高性能水声通信带来了极大的挑战。 时间反转技术近年来成为水下通信的热点研究技术,其最大的优点是可在没有任何环境先验知识的情况下实现多径聚焦,提高检测信噪比。直接序列扩频技术具有抗干扰、抗多径衰落、可提高扩频增益等优点已经在水声通信中广泛应用。 考虑到时变信道下时间反转性能的下降,结合时间反转和扩频通信的优点,本文提出可适应时变信道的时间反转扩频通信方案,...With the rapid development of marine exploitation, marine environment monitoring, marine national defense and security, the requirement of transmitting information through underwater channel is increasing in recent years, so underwater acoustic communication has drawn significant attention. However, the complexity, time-varying and uncertainty of underwater acoustic channel character lead to Doppl...学位:理学硕士院系专业:海洋与环境学院_海洋物理学号:3112010115129

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