基于被动时反的时分复用下行通信研究  

A research of time division multiplexed downlink communications using passive time reversal

作　　者：孙琳[1] 李若 周天[1,2] 

机构地区：[1]哈尔滨工程大学水声工程学院,黑龙江哈尔滨150001 [2]哈尔滨工程大学水声技术重点实验室,黑龙江哈尔滨150001

出　　处：《哈尔滨工程大学学报》2013年第10期1254-1260,共7页Journal of Harbin Engineering University

基　　金：中国高等学校博士学科点专项科研基金资助项目(20112304130003);中央高校基本科研业务费专项资金资助项目(HEUCFR1012;HEUCF130501)

摘　　要：为了解决现有时反通信方案不能实现单工模式下行通信的问题,提出了基于被动时反的时分复用下行通信方案,对该方案的原理和性能进行了理论分析和仿真研究.理论推导表明,被动时反处理后的信号中增加了一个由信道响应的互相关而产生的信号分量.分析了该分量对码间干扰和噪声干扰的影响,推导出码间干扰、噪声干扰及总干扰的一般表达式.基于典型的浅海信道模型,对码间干扰、噪声干扰以及总干扰进行了计算,分析了提出的方案的性能与阵元数、阵元间距及输入信噪比等参数的关系.结果表明,提出的方案不仅可以解决利用时反技术实现单工模式的下行通信的问题,而且能够提高输入信噪比较低的双工模式的下行通信的性能.In order to solve the problem that the existing time reversal communication scheme is hard to achieve sim- plex downlink communication, a time division multiplexing downlink communication scheme on basis of passive time reversal was proposed. Theoretical analysis and simulative research were carried out for the theory and perform- ances of the proposed scheme. The theoretical analysis shows that a signal component generated from the cross-cor- relation of channel response was added into the signal experiencing passive time reversal processing. The effects of the signal component on intersymbol interference （ISI） and noise were analyzed and the general expressions on ISI, noise and total interference were derived. Based on a typical shallow water channel model, ISI, noise and total in- terference were computed, the relationships between the performance of the proposed scheme and the number of el- ements, spacing of elements and the input signal-to-noise ratio were analyzed. The results show that the proposed scheme may not only achieve downlink communication of the simplex system using time reversal, but also improve the performance of the downlink communication of the duplex system with low input signal-to-noise ratio.

关 键 词：被动时反 时分复用 下行通信 码间干扰 噪声干扰 

分 类 号：TN929.3[电子电信—通信与信息系统]