稀疏多徑信道的T/2間隔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: 完全反饋均衡器(Complete Feedback Equalizer, CFE)是判決反饋均衡器(DFE)的改進(jìn)。該文提出了一種T/2分?jǐn)?shù)間隔稀疏CFE(T/2 Sparse CFE, T/2-SCFE)結(jié)構(gòu)，以避免接收機(jī)對于符號定時誤差的敏感性，并有效利用長時延擴(kuò)展多徑信道的稀疏性來降低均衡器的復(fù)雜度。理論分析與基于實(shí)測信道的計(jì)算機(jī)仿真表明， T/2-SCFE均衡器對符號定時誤差保持了穩(wěn)健性，總體性能優(yōu)于符號間隔CFE及分?jǐn)?shù)間隔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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