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电子学报  2004 

TDD相位预均衡OFDM系统中的定时误差分析

, PP. 136-140

Keywords: OFDM,预均衡,定时误差,信道估计

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Abstract:

研究了在多径瑞利衰落环境中,抽样定时误差对相位调制的时分双工(TDD)预均衡正交频分多路复用系统(OFDM)的误码率性能影响.给出了理想和非理想相位预均衡处理的误码率解析表达式,并进行了计算机仿真,仿真和理论分析相符.对于TDD相位预均衡OFDM系统,定时误差导致了解调数据的相位旋转,且系统性能随定时误差的增加呈加速恶化的趋势.与无定时误差的瑞利衰落性能上界相比,当归一化定时误差为1/8时,理想和非理想相位预均衡的性能分别损失了约1dB和3dB;归一化定时误差为1/4时,二者的性能均严重恶化且差距减小,这时候定时误差成为影响系统性能的主要因素.

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