虚拟时间反转镜PDS水声通信双向均衡方案  

Research on bidirectional equalization in PDS system for under-water acoustic communication

作　　者：赵安邦[1] 解立坤[1] 陈凯[1,2] 周彬 路晓磊[1] 

机构地区：[1]哈尔滨工程大学水声技术国家重点实验室 [2]广东湛江91388部队

出　　处：《声学技术》2011年第6期480-483,共4页Technical Acoustics

基　　金：国家自然科学基金((51009041);海洋公益性行业科研专项经费项目(gz2010001);中央高校基本科研业务费专项资金(F030102)

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。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.

关 键 词：虚拟时间反转镜 PATTERN时延差编码 双向均衡 

分 类 号：TN911.72[电子电信—通信与信息系统]