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循环前缀不足的OFDM信号检测方法

DOI: 10.13190/jbupt.200706.10.yangzh, PP. 10-13

Keywords: 正交频分复用,残留码间干扰,循环前缀,非采样间隔信道

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Abstract:

提出了一种适用于正交频分复用(OFDM)系统循环前缀(CP)不足情况下的新型信号检测方法。时变信道以及信道冲激响应超过CP会带来子信道间干扰(ICI)和残留码间干扰(ISI),产生误码率平台。本文方法结合ICI消除,利用判决数据,通过快速傅立叶(FFT)变换和反快速傅立叶(IFFT)变换,估出残留ISI,恢复信号循环性。该方法适用于非采样间隔信道且计算量较低。在静态及缓时变信道条件下的仿真结果表明,应用该方法可使CP不足的OFDM系统性能得到改善。

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