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Research on the Key Techniques of DFT-SOFDM Underwater Acoustic Communication System and the Implementation Based on DSP

Abstract

长的传输时延、多普勒扩散、频率选择性衰落以及有限的可用带宽等诸多因素,决定了水声通信信道的复杂性。然而20世纪以来,由于军用和民用的需求,水下通信技术开始被广泛研究。当今社会对高速率的传输系统的需求也日益迫切。多载波调制技术被认为是高速水下通信的一种备选方案,其中最常用的是正交频分复用(OFDM)技术。但是,OFDM技术本身有一些缺陷,其中之一就是具有较高的峰值平均功率比。 本文研究了一种适用于在水声信道中使用的DFT扩展正交频分复用(DFT-SOFDM)技术,它不仅具备传统的OFDM的优势,而且具有更低的峰值平均功率比。本文着重研究DFT-SOFDM的关键技术及其DSP实现。计算机仿真结果...The complexity of underwater acoustic communication channel is driven by the ocean environment characteristics, including large delay, Doppler-spreads, frequency-selective fading and limited bandwidth. However, since the 20th century, underwater communication has been widely studied and there is a pressing demand for higher data rate systems. Multi-carrier modulation is an alternative high data ra...学位:工学硕士院系专业:信息科学与技术学院通信工程系_通信与信息系统学号:2332007115219

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