Performance of combined equalization and TCM decoding for Rayleigh fading channels

Proceedings of PIMRC '96 - 7th International Symposium on Personal, Indoor, and Mobile Communications Pub Date : 1996-10-15 DOI:10.1109/PIMRC.1996.568451

M. Reinhardt, T. Huschka, J. Lindner

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引用次数: 2

Abstract

We describe a power and bandwidth efficient transmission scheme for Rayleigh fading channels and a suitable low complexity combined equalization and decoding system. The transmission system is based on an orthonormal transform (fast Hadamard transform) combined with trellis-coded modulation (TCM). The receiver uses an iterative block decision feedback equalizer and a Viterbi algorithm to decode the TCM. It is shown that the equalizer transforms the Rayleigh fading channel asymptotically into a set of parallel AWGN subchannels. Therefore, the decoder of each subchannel "sees" an AWGN channel. Hence, coding gains comparable to the coding gains in an AWGN environment can be achieved. The results are considerably better than the performance of TCM codes designed for the Rayleigh fading channel with the same power and bandwidth efficiency. The conclusions of channel capacity considerations support the potential of the proposed transmission and reception scheme. The theoretical findings are furthermore supported by simulation results.

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瑞利衰落信道的均衡与TCM联合译码性能研究

提出了一种功率和带宽均有效的瑞利衰落信道传输方案，以及一种合适的低复杂度均衡与解码组合系统。该传输系统是基于标准正交变换(快速哈达玛变换)和网格编码调制(TCM)相结合的传输系统。接收端采用迭代块决策反馈均衡器和Viterbi算法对TCM进行译码。结果表明，均衡器将瑞利衰落信道渐近地转化为一组并行的AWGN子信道。因此，每个子信道的解码器“看到”一个AWGN信道。因此，可以实现与AWGN环境中的编码增益相当的编码增益。结果表明，在相同功率和带宽效率下，针对瑞利衰落信道设计的TCM码的性能明显优于传统的TCM码。信道容量考虑的结论支持了所提议的发送和接收方案的潜力。仿真结果进一步支持了理论研究结果。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Proceedings of PIMRC '96 - 7th International Symposium on Personal, Indoor, and Mobile Communications

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