稀疏多径信道的T/2间隔CFE均衡器研究
T/2 Fractionally-Spaced Complete Feedback Equalizer in Wireless Sparse Multi-path Channels
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摘要: 完全反馈均衡器(Complete Feedback Equalizer, CFE)是判决反馈均衡器(DFE)的改进。该文提出了一种T/2分数间隔稀疏CFE(T/2 Sparse CFE, T/2-SCFE)结构，以避免接收机对于符号定时误差的敏感性，并有效利用长时延扩展多径信道的稀疏性来降低均衡器的复杂度。理论分析与基于实测信道的计算机仿真表明， T/2-SCFE均衡器对符号定时误差保持了稳健性，总体性能优于符号间隔CFE及分数间隔DFE。Abstract: A T/2 fractionally-spaced sparse complete feedback equalizer scheme is proposed to avoid the performance deterioration caused by symbol timing error in the receiver, which is a generalized version of the previously proposed Complete Feedback Equalizer (CFE). The performance of the scheme is analyzed based on minimum mean square error (MMSE) criterion, and the MMSE performance is proved to be the same as that of the Decision Feedback Equalizer (DFE). The scheme also effectively exploits the sparseness of the multi-path channels with large delay spread and reduces the complexity of the equalizer with small performance degradation. Theoretical analysis and computer simulations over field measured wireless channel show that the scheme performs better than symbol-spaced CFE and T/2 fractionally-spaced DFE.
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