arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0707.0799cs.ITmath.IT
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一类新的酉空时码及其快速并行球形译码算法

A New Family of Unitary Space-Time Codes with a Fast Parallel Sphere Decoder Algorithm

Xinjia Chen, Kemin Zhou, Jorge Aravena

摘要:

在本文中,我们提出了一个新的设计准则和一类新的酉信号星座的差分空时调制多天线系统在瑞利平坦衰落信道的衰落系数未知。大量的仿真结果表明,新的代码有显着更好的性能比现有的代码。我们已经比较了我们的代码的性能与差分检测方案,使用正交设计,凯莱差分码,不动点自由的分组码和产品的群体和对于相同的比特出错率,我们的代码允许更小的信号噪声比高达10 dB。新码的设计是通过性能指标的优化以系统的方式完成的,该性能指标密切地描述了作为信噪比的函数的比特出错率。新的性能指标是计算简单,我们推导出其梯度相对于星座参数的解析表达式。解码建议星座减少到一组一维最近点的问题,我们使用并行球解码器算法解决。该译码策略还可以提高现有码的译码效率。

英文摘要:

In this paper we propose a new design criterion and a new class of unitary signal constellations for differential space-time modulation for multiple-antenna systems over Rayleigh flat-fading channels with unknown fading coefficients. Extensive simulations show that the new codes have significantly better performance than existing codes. We have compared the performance of our codes with differential detection schemes using orthogonal design, Cayley differential codes, fixed-point-free group codes and product of groups and for the same bit error rate, our codes allow smaller signal to noise ratio by as much as 10 dB. The design of the new codes is accomplished in a systematic way through the optimization of a performance index that closely describes the bit error rate as a function of the signal to noise ratio. The new performance index is computationally simple and we have derived analytical expressions for its gradient with respect to constellation parameters. Decoding of the proposed constellations is reduced to a set of one-dimensional closest point problems that we solve using parallel sphere decoder algorithms. This decoding strategy can also improve efficiency of existing codes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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