中文摘要：

虚拟时间反转镜（Virtual Time Reversal Mirror,VTRM）引导了空间聚焦和信道均衡,将其应用在Pattern时延差编码（Pattern Time Delay Shift Coding,PDS）水声通信体制,构成VTRM-PDS系统,可增强抗多途干扰的能力。但当通信节点间存在缓慢运动,即信道缓慢时变时,在一帧信号中,信道均衡的效果会随时间逐渐降低,产生失配现象。提出了双向均衡方案,在没有信道先验知识的前提下,通过前向和后向信道均衡,充分利用探测信号和信道信息,提高了信道均衡效果。湖试结果证明了该方案的优越性。

英文摘要：

Virtual time reversal mirror（VTRM） leads to spatial focusing and adaptive channel equalization.When VTRM is applied to pattern time delay shift coding（PDS） system for underwater acoustic communication,the system is called VTRM-PDS system,and so the system has the ability of resisting multipath interference.But when the communication nodes have slow movement,the channel is time-variant,and so in a frame of signal,the channel equalization effect will decrease with the time and mismatch will happen.Bidirectional equalization scheme is proposed in the paper.The scheme can adequately use detection signal and channel information and increase channel equalization effect by for-ward and backward equalization without study of channel.The lake trial results prove the superiority of bidirectional equalization scheme.