Diversity Combining over Rayleigh Fading Channels with Symmetric Alpha-Stable Noise
Diversity Combining over Rayleigh Fading Channels with Symmetric Alpha-Stable Noise
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DOI：
10.1109/twc.2010.071410.100194
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发表时间：
2010-09
影响因子：
10.4
通讯作者：
A. Rajan;C. Tepedelenlioğlu
中科院分区：
文献类型：
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作者：
A. Rajan;C. Tepedelenlioğlu
本文讨论的比特错误率性能的分集合并方案的单用户通信系统工作在瑞利平坦衰落信道受到脉冲α稳定的噪声，这是已知的，由于网络干扰的泊松场的干扰源。在此条件下，对一个理论基准接收机进行了分析，得到了该接收机可能达到的最大分集阶数为Lα/2，其中L为天线数，α为噪声的特征指数。此外，已经确定了分集增益和阵列增益之间的权衡。传统的线性匹配滤波器接收机（在高斯情况下也称为最大比合并）已经被证明具有α/2的分集阶数，从而不能从空间分集中受益。推导了检测后合并的分集增益和阵列增益的封闭表达式。作为对传统合并方案的改进，本文导出了最佳最大似然检测器。一个更简单的高信噪比近似的检测器不依赖于噪声参数，并进行了比较稳定的噪声下的广义柯西检测器。蒙特-卡罗模拟是用来补充我们的分析结果，并比较检测器的性能。
This paper addresses the bit error rate performance of diversity combining schemes for a single-user communication system operating over Rayleigh flat fading channels subject to impulsive alpha-stable noise, which is known to arise due to network interference from a Poisson field of interference sources. Under this setting, a theoretical benchmark receiver is analyzed, the maximum possible diversity order attainable is derived to be Lα/2, where L is the number of antennas and α is the characteristic exponent of the noise. Moreover, trade-offs between the diversity gain and the array gain have been identified. The conventional linear matched filter receiver (also known as maximum ratio combining in the Gaussian case) has been shown to have a diversity order of α/2, thereby not benefiting from spatial diversity. Closed form expressions for the diversity gain and array gain of post-detection combining have been derived. As an improvement to conventional combining schemes, the optimum maximum likelihood detector is derived. A simpler high SNR approximation of the detector is shown to not depend on the noise parameters, and is compared to the generalized Cauchy detector under stable noise. Monte-Carlo simulations are used to supplement our analytical results and compare the performance of the detectors.