摘要本文对当今的一些隐蔽水声通信技术进行了总结,并用matlab软件对其中的某些结论进行了仿真、验证。文中涉及了信号的调制机制、接收机结构及一些参数对误码率的影响。在隐蔽水声通信中,发送端采用直接序列扩频调制方式,它可以有效对抗干扰,并且受扩频调制的信号具有低截获率的特性。在接收端采用可有效适应多径通信环境的RAKE接收机,RAKE接收技术属于分集接收方式的一种,可以合并多径信号来增加输出信号的强度。文章最后列出了matlab仿真结果,提高RAKE接收机指峰数或信道多径数量可以降低误码率的结论将得到验证。8674 关键词隐蔽水声通信直接序列扩频调制RAKE接收机误码率 毕业设计说明书(论文)外文摘要 Titlestudy on covert underwater munication technology Abstract Abstract:This paper summarizes some technology of covert underwater munication and verifys a few conclusions using MATLAB software simulation. The mechanism of modulation of the signal and the receiver structure along with sequence and channel parameters which impacts on the BER are presented. In this paper, concealment of Direct Sequence Spread Spectrum(DSSS) based modem and the structure and performance of the RAKE receiver are proposed and discussed. Finally, the conclusion that the increase of the number of receiving fingers or the number of the propagation paths lowers he bit error rate(BER) will be verified by the SNR-BER curves drawn by the MATLAB. Keywordscovert underwater munication; DSSS; RAKE receiver;matlab; BER 目次 1. 绪论:1 . 课题研究的背景及意义1 . 国内外的研究现状1