时变信道下频域均衡系统的干扰抑制  

Interference cancellation for frequency- domain equalization systems in time-variant channels

作　　者：施婷婷[1] 周世东[1] 姚彦[1] 

机构地区：[1]清华大学电子工程系微波与数字通信技术国家重点实验室,北京100084

出　　处：《清华大学学报（自然科学版）》2005年第3期329-333,336,共6页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(90204001);国家"八六三"高技术项目(2001AA123012)

摘　　要：信道的时变特性会影响单载波频域均衡(SC-FDE)系统的性能。对时变导致的干扰进行了理论分析,并在此基础上,参考正交频分复用(OFDM)系统中载波间干扰的消除方法,提出了单载波频域均衡系统中干扰自消除、时域加窗和分段均衡等抑制信道时变干扰的方法。分析和仿真表明,这几种方法都能有效地抑制信道时变导致的干扰。但是干扰自消除和时域加窗方法需要重复传送相同的信息,效率有所下降;而分段均衡方法增加分段数目,在提高系统性能的同时也增加了接收复杂度。A time-variant multipath channel distorts a single carrier frequency-domain equalization (SC-FDE) system. This paper analyzes the interference due to the time-variant channels to reduce the interference in SC-FDE systems with interference self-cancellation, time-domain windowing, and segment equalization. The simulations show that the effect of the time-variant channel can be effectively reduced with these methods. The redundant modulations of interference self-cancellation and time-domain windowing cause reductions in efficiency. Increasing the number of segments increases the complexity of segment equalization.

关 键 词：频域均衡 时变信道 干扰自消除 时域加窗 分段均衡 

分 类 号：TN92[电子电信—通信与信息系统]