脉冲噪声对空时分组码性能影响的研究

Evaluation of the Effect of Impulsive Noise on Space-Time Block Coding

该文对脉冲及非高斯噪声环境下空时分组码(STBC)性能进行了研究。采用脉冲和高斯加性混合噪声模型,利用矩母函数(MGF)分析方法,通过建立多发单收(MISO)近似等效模型,推导出Rayleigh衰落信道下MISO空时分组码误符号率(SER)闭式表达式的渐近解。在此基础上,对于不同脉冲噪声发生概率、脉冲噪声与高斯噪声功率比条件下STBC的性能进行了分析。结果表明,即使在高信噪比情况下,混合噪声也将会使STBC系统性能显著降低。蒙特卡洛仿真结果验证了SER闭式解的有效性。

The problem of the analyses of Space-Time Block Coding （STBC） in impulsive, non-Gaussian noise environments is considered. A model of an additive mixture of Gaussian and non-Gaussian impulsive noise is adopted, and the asymptotical solution of the closed-form expression for the average symbol error rate （SER） of orthogonal space-time block coding over Rayleigh flat fading channel is derived by means of the Moment Generating Function （MGF） with the approximate equivalent Multiple-Input Single-Output （MISO） model of mixture noise. Also, the performance evaluation of STBC is performed in terms of the impulsive noise occurring probability and the power ratio of the impulsive noise to the Gaussian noise. It is shown that mixture noise degrades the system performance significantly even at high SNR. Monte Caro simulation results corroborate the effectiveness of analyses.