基于时变衰落信道分解的OFDM信号接收技术  

OFDM Signal Receiving Technique Based on Time-varying Fading Channels Decomposing

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,北京100876

出　　处：《电子与信息学报》2005年第10期1630-1634,共5页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(60272052)资助课题

摘　　要：OFDM信号在时变衰落信道中传输时存在载波间干扰(ICI),降低了系统的性能。基于衰落信道的多普勒分解,OFDM信号在时变衰落信道中的传输可以等效成信息数据直接通过无衰落的离散白噪声滤波器模型信道传输,改进的Viterbi算法可用于接收这类信号。该接收技术可以有效去除传统的OFDM系统中的载波间干扰,消除误码的地板效应,提高了系统性能。There exist Inter-Carrier Interference （ICI） phenomena when OFDM signals are transmitted through time-varying fading channels. The performance of communication systems also decreases. Based on decomposing of time-varying fading channels, the system can be treated as data transmitting through a discrete-time white noise filter model channel. The Viterbi algorithm is used to receive the signal. In this way, the ICI and ＂error floor＂ in traditional OFDM system are removed, and the performance is enhanced.

关 键 词：OFDM 时变衰落 信道分解 信道模型 VITERBI算法 

分 类 号：TN929.5[电子电信—通信与信息系统]