时变衰落信道中同步时间扩展信号的分集接收技术  

Diversity Receiving Technique for Synchronous Time Spreading Signal in Time-Varying Fading Channels

作　　者：孟德香[1] 吴湛击[1] 梁红玉[1] 吴伟陵[1] 

机构地区：[1]北京邮电大学信息工程系,181信箱北京100876

出　　处：《电子与信息学报》2005年第11期1695-1698,共4页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(60272052)

摘　　要：扩频通信可以区分多径信号进行RAKE 分集接收,是一种有效处理多径效应的手段。与此对应,时间扩展通信也可以在频域上进行类似“RAKE”的分集接收,有效处理时变衰落带来的影响。时间扩展会带来严重的符号间干扰,同步时间扩展可以有效控制和处理符号间干扰。基于信道分解的分集接收技术保证了同步时间扩展在时变衰落信道下的性能。获得10^(-4)误码率,本文分集算法(扩展长度1024)在时变衰落信道中所需的信噪比与AWGN 信道不分集处理所需的信噪比只相差1.4dB。By Spectrum Spreading, the multi-path signals can be distinguished and received by RAKE receiver, and spectrum spreading is an efficient way to overcome multi-path fading. Time spreading can implement RAKE diversity receiving in frequency domain. But time spreading comes with serious ISI in fading channels. Synchronous time spreading can overcome the ISI. By channel decomposing, the signal can be received by diversity receiver, so good performance can be achieved. To achieve 10^-4 BER performance, the SNR required in time-varying fading channels by our algorithm with 1024 bit spreading length is only 1.4dB more than that in AWGN channels without diversity.

关 键 词：时间扩展 时变衰落信道 信道分解 RAKE接收 

分 类 号：TN929.5[电子电信—通信与信息系统]