Underwater acoustic communication channels: propagation models and statistical characterization
IEEE Communications Magazine
Experimental demonstration of time reversal communication in doubly dispersive underwater channels
Proceedings of the Eighth ACM International Conference on Underwater Networks and Systems
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Time reversal processing (TRP) has been proved to achieve temporal compressing when the waveguide environment is invariant. Underwater acoustic communications exploit this feature as it can reduce severe inter-symbol-interferences caused by complex multi-path propagation without any prior knowledge of the underwater acoustic channel. When conducting acoustic communications in the real ocean, environmental variations occur almost all the time, and indeed become one of the main factors determining the communication performance. However, it has been shown in numerous experiments that when the TRP is applied to the channel impulse response (CIR), the resulted response is relatively slowly time-varying compared to the CIR itself. Thus in the present paper, we exploit this factor and develop a channel tracking approach based on the so-called time-reversed channel response. Experimental results demonstrate that, compared to the conventional equalization method countering the CIR variation, the new approach requires less frequent update of the CIR in a time-variant environment, also achieving significant computational saving in tracking the channel.