基于时变衰落信道分解的OFDM信号接收技术

孟德香; 吴湛击; 梁红玉; 吴伟陵

基于时变衰落信道分解的OFDM信号接收技术

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出版历程
- 收稿日期: 2004-04-12
- 修回日期: 2004-09-13
- 刊出日期: 2005-10-19

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

摘要

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。
- OFDM; 时变衰落; 信道分解;信道模型;Viterbi算法
Abstract: 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.

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