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	采用时反和时频差分OFDM的水声语音通信方法; Underwater acoustic speech communication using time reversal and time-frequency differential ofDM methods
	周跃海 ; 江伟华 ; 陈磊 ; 童峰
	2015-07-15
关键词	水下语音通信 多通道时间反转 时频差分OFDM Underwater acoustic speech communication Multi-path time reversal Time-frequency differential ofDM
英文摘要	针对水声信道多径、时变、多普勒等恶劣传输特点对水声语音通信的严重影响,本文采用多通道时间反转和时频差分OfdM进行水声语音通信技术方案设计,该方法首先通过多通道时间反转进行时间域和空间域多径聚焦,进而结合时频差分OfdM调制解调抑制残留多径的影响。由于无需采用信道估计和均衡算法,系统实现方便、复杂度低,同时对信道具有一定程度的稳健性。该方法语音压缩编码采用混合激励线性预测编码。仿真实验和海试实验表明了本文方案的有效性。; The difficulties of underwater acoustic channel, i.e., multipath, time varying and Doppler shifting pose significant challenges to underwater acoustic speech communication.In this paper, multi-channel time reversal is incorporated with time-frequency differential orthogonal frequency division multiplexing(ofDM)technology to design an underwater acoustic speech communication system, which enables time-frequency domain focusing of multipath by multi-channel time reversal, as well as suppressing of the residual multipath with time-frequency differential ofDM.Thus the employment of complicated channel estimation and equalization are avoided to facilitate the low complexity system implementation.In addition, the mixed-excitation linear predictive(MELP) is employed for speech encoding.The simulation and sea trial demonstrate the effectiveness of the method at presence of time varying multipath underwater acoustic channel.; 国家自然科学基金资助项目(11274259)
语种	zh_CN
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/104800]
专题	海洋环境－已发表论文
推荐引用方式 GB/T 7714	周跃海,江伟华,陈磊,等. 采用时反和时频差分OFDM的水声语音通信方法, Underwater acoustic speech communication using time reversal and time-frequency differential ofDM methods[J],2015.
APA	周跃海,江伟华,陈磊,&童峰.(2015).采用时反和时频差分OFDM的水声语音通信方法..
MLA	周跃海,et al."采用时反和时频差分OFDM的水声语音通信方法".(2015).

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