文章摘要
周跃海,江伟华,陈磊,童峰.采用时反和时频差分OFDM的水声语音通信方法[J].,2015,34(4):283-290
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
投稿时间:2014-10-10  修订日期:2015-06-23
中文摘要:
      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。
英文摘要:
      The difficulties of underwater acoustic channel, i.e., multipath, time varying and Doppler shifting poses 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 is 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 demonstrated the effectiveness of the method at presence of time varying multipath underwater acoustic channel.
DOI:10.11684/j.issn.1000-310X.2015.04.001
中文关键词: 水下语音通信  多通道时间反转  时频差分OFDM
英文关键词: underwater acoustic speech communication  multi-path time reversal  time-frequency differential OFDM
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位E-mail
周跃海 厦门大学海洋与地球学院 ruddy100@sina.com 
江伟华 厦门大学海洋与地球学院 whjiang268@126.com 
陈磊 厦门大学海洋与地球学院 wc407304980@163.com 
童峰 厦门大学海洋与地球学院 ftong@xmu.edu.cn 
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