MMSE DECISION-FEEDBACK EQUALIZERS AND CODING .1. EQUALIZATION RESULTS
MMSE DECISION-FEEDBACK EQUALIZERS AND CODING .1. EQUALIZATION RESULTS
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DOI：
10.1109/26.469441
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发表时间：
1995-10-01
影响因子：
8.3
通讯作者：
FORNEY, GD
中科院分区：
文献类型：
--
作者：
CIOFFI, JM;DUDEVOIR, GP;FORNEY, GD
最小均方误差判决反馈均衡器（MMSE-DFE）的特性表明，它是一个典型的均衡结构的系统，联合收割机均衡与编码调制相结合。在这篇由两部分组成的论文的第一部分中，使用线性估计理论原理简明地推导了MMSE-DFE的结构和性能。MMSE-DFE的前端称为“均方白化匹配滤波器”（MS-WMF），在某些方面优于匹配滤波器或白化匹配滤波器作为标准接收机前端。在编码系统中，MMSE-DFE的反馈滤波器可以使用预编码在发射机中实现JMSE-DFE可以比迫零判决反馈均衡器执行得明显更好，特别是在中低SNR和严重ISI信道上。MMSE-DFE是有偏的。最佳无偏MMSE-DFE是去除了偏置的MMSE-DFE。去除偏差提高了错误概率，但将SNR降低到SNR（MMSE-DFE，U）= SNR（MMSE-DFE）-1。结果表明，这种SNR关系是一个非常一般的结果的特殊情况，SNR（MMSE-DFE，U）给出了更现实的SNR估计。在附录中，将结果扩展到部分响应均衡和相关输入均衡。
The minimum mean-squared-error decision-feedback equalizer (MMSE-DFE) has properties that suggest that it is a canonical equalization structure for systems that combine equalization with coded modulation. The structure and performance of the MMSE-DFE are succinctly derived using linear-estimation-theoretic principles in this first part of this two-part paper.The front-end of the MMSE-DFE, called the ''mean-square whitened matched filter'' (MS-WMF), is preferable in some ways to a matched filter or a whitened matched filter as a canonical receiver front end. In a coded system, the feedback filter of the MMSE-DFE may be implemented in the transmitter using precoding.The MMSE-DFE can perform significantly better than a zero-forcing decision-feedback equalizer, particularly at moderate-to-low SNR's and on severe-ISI channels. The MMSE-DFE is biased. The optimum unbiased MMSE-DFE is the MMSE-DFE with the bias removed. Removing bias improves error probability, but reduces the SNR toSNR(MMSE-DFE,U) = SNR(MMSE-DFE) - 1It is shown that this SNR relationship is a particular case of a very general result and that SNR(MMSE-DFE,U) gives a more realistic estimate of SNR. The results are extended to partial response equalization and to equalization with correlated inputs in an appendix.