| 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） |
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