时间反转直扩通信系统及性能分析

Time-Reversal DSSS Communication Systems and Performance Analysis

时间反转传输技术的空时聚焦特性能够有效地提升通信系统的性能.本文设计了一种将时间反转技术应用于直扩通信系统的方案,并对多径衰落信道下单用户和多用户系统的接收信干噪比、系统容量、误比特率等性能进行了理论分析与仿真验证.理论与仿真结果表明,通过时间反转预处理,直扩通信系统的性能得到了改善,且优于复杂度较高的多通道Rake接收的系统,且多径数目越多,优势越明显.

The space-time focusing characteristics of the time-reversal transmission technology can effectively im-prove the performance of the communication system.This paper designs a scheme that applies the time-reversal technology to the direct-spread-spread-spectrum(DSSS)communication system.The performance of the system,such as receiving sig-nal-to-interference-noise ratio,system capacity,and bit error rate,is analyzed theoretically and verified by simulation.The-oretical and simulation results show that the performance of the DSSS communication system has been significantly im-proved through time-reversal preprocessing,and it is better than the system using multi-channel Rake receiver with high complexity,and the more the number of multi-paths,the more obvious the advantage.