基于时间反转镜的水声通信方案分析

Time reversal mirror-based underwater acoustic communication scheme

提出了基于时间反转镜(TRM)的水声通信方案,该方案可在没有任何先验知识的情况下具有自适应匹配声信道的作用.上行通信采用虚拟式时间反转镜,可在接收机中通过数字卷积运算实现时间反转镜;下行通信采用主动式时间反转镜,利用上行通信中接收到的探测码的时间反转作为信息码元载体,有助于减少水下用户端信道均衡设备复杂性并节省功耗.通过仿真,验证了该方案能够有效地抑制声信道多途扩展产生的码间干扰,具有很好的鲁棒性.

The underwater acoustic communication scheme using time reversal mirror was proposed, which raked advantage of the heterogeneity of the medium to match the acoustic channel automatically without any transcendental knowledge. A virtual time reversal mirror was applied to upstream communication implemented by convolution in computer instead of ocean channel; for downstream communication, an active time reversal mirror was adopted to reduce the complexity and power-cost, which could use the received probe-code at upstream communication. The results of computer simulations show that the underwater acoustic communication system could mitigate the intersymbol interference robustly caused by acoustic multipath channel.