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首页> 外文期刊>IEEE Transactions on Communications >Trellis-coded differential unitary space-time modulation over flat fading channels
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Trellis-coded differential unitary space-time modulation over flat fading channels

机译：平坦衰落信道上的网格编码差分unit时空调制

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摘要

Coding and modulation for multiple-antenna systems have gained much attention in wireless communications. This paper investigates a noncoherent trellis-coded scheme based on differential unitary space-time modulation when neither the transmitter nor the receiver know the channel. In a time-varying flat Rayleigh fading environment, we derive differentially noncoherent decision metrics and obtain performance measures for systems with either an ideal interleaver or no interleaver. We demonstrate that with an ideal interleaver, the system performance is dominated by the minimum Hamming distance of the trellis code, while without an interleaver, the performance is dominated by the minimum free squared determinant distance (a novel generalization of the Euclidean distance) of the code. For both cases, code construction is described for Ungerboeck-type codes. Several examples that are based on diagonal cyclic group constellations and offer a good tradeoff between the coding advantage and trellis complexity are provided. Simulation results show that, by applying the soft-decision Viterbi decoder, the proposed scheme can achieve very good performance even with few receive antennas. Extensions to trellis-coded differential space-time block codes are also discussed.
机译：在无线通信中，多天线系统的编码和调制倍受关注。当发射机和接收机都不知道信道时，本文研究了一种基于差分unit时空调制的非相干网格编码方案。在时变平坦的瑞利衰落环境中，我们导出差分非相干决策指标，并获得具有理想交织器或无交织器的系统的性能指标。我们证明，在理想的交织器中，系统性能由网格代码的最小汉明距离决定，而在没有交织器的情况下，系统性能由交织器的最小自由平方行列式距离（欧氏距离的新颖概括）决定。码。对于这两种情况，都描述了Ungerboeck型代码的代码构造。提供了一些基于对角线循环群构象并在编码优势和网格复杂度之间取得良好折衷的示例。仿真结果表明，通过应用软判决维特比解码器，即使在接收天线很少的情况下，该方案也可以实现很好的性能。还讨论了网格编码差分时空分组码的扩展。

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