相关衰落信道上16-QAM BICM的联合迭代估计与译码

Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002. Pub Date : 2002-11-03 DOI:10.1109/ACSSC.2002.1197157

Yuheng Huang, J. Ritcey

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引用次数: 1

摘要

研究了频率平坦衰落信道下16-QAM位交错编码调制(BICM)的联合迭代信道估计与译码。复杂信道增益的估计首先由已知导频符号通过最优维纳滤波得到，并作为初始信道状态信息传递给BICM迭代解码器。在每次译码迭代后，使用从解码器反馈的外部信息来改进信道估计。一种称为“重启”的高级方案被开发出来，通过使用改进的信道增益估计在几次迭代后重新启动解码器来有效地降低误码率下限。基于对传输序列中突发错误的观察，将Reed-Solomon码与BICM串接，扩展了“重启”算法。当采用RS(255,223)码进行BICM时，采用16-QAM改进的集划分标记和16状态码，当归一化衰落率f/sub d/T/sub s/ = 0.02时，在E/sub b//N/sub 0/为10.5 dB时，可以实现10/sup -6/的误码率。

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Joint iterative estimation and decoding for 16-QAM BICM over correlated fading channels

Joint iterative channel estimation and decoding for 16-QAM bit-interleaved coded modulation (BICM) is considered over frequency-flat fading channels. Estimates of the complex channel gain are derived first from known pilot symbols by optimum Wiener filtering and passed to the BICM iterative decoder as initial channel state information. After each decoding iteration, the channel estimates are refined using the extrinsic information fed back from the decoder. An advanced scheme called "restart" is developed to effectively reduce the bit error rate floor, by restarting the decoder after several iterations with the refined channel gain estimates. Motivated by the observation of the burst errors in the transmitted sequence, the "restart" algorithm is extended by concatenating Reed-Solomon codes with BICM. When RS (255, 223) code is used for BICM with 16-QAM modified set partitioning labeling and a 16-state code, the BER of 10/sup -6/ can be achieved at E/sub b//N/sub 0/ of 10.5 dB for normalized fade rate f/sub d/T/sub s/ = 0.02.

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Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002.

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