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Diversity combining in FSO systems in presence of non-Gaussian noise

机译:存在非高斯噪声的FSO系统中的分集合并

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Free-space optics (FSO) communication has received much attention in recent years as a cost-effective, license-free, and wide-bandwidth access technique for high data rate applications. The performance of FSO communication, however, severely suffers from turbulence caused by atmospheric conditions. Multiple photodetectors can be placed at the receiver to mitigate the turbulence and exploit the advantages of spatial diversity combining. In this paper, we analyze the bit error rate (BER) performance of an FSO communication system employing binary phase-shift keying with additive non-Gaussian noise over negative exponential distributed atmospheric turbulence and spatial diversity at the receiver. The Laplace distribution is used to model the non-Gaussian impulsive noise. We consider the case when perfect channel state information is available at the receiver for implementation of coherent detection. Analytical expressions for the BER of a single channel receiver as well as that of a diversity combining receiver using selection combining, dual-diversity equal-gain combining, and maximalratio combining are derived. The derived analytical expressions are verified by simulation results.
机译:近年来,自由空间光学(FSO)通信作为一种高成本,免许可证和用于高数据速率应用的宽带访问技术而受到了广泛关注。但是,FSO通信的性能严重受到大气条件引起的紊流的影响。可以在接收器处放置多个光电探测器,以减轻湍流并利用空间分集组合的优势。在本文中,我们分析了在接收器的负指数分布的大气湍流和空间分集下,采用二进制相移键控和加性非高斯噪声的FSO通信系统的误码率(BER)性能。拉普拉斯分布用于模拟非高斯脉冲噪声。我们考虑当接收机可以使用完美的信道状态信息进行相干检测时的情况。推导了使用选择组合,双分集等增益组合和最大比组合的单通道接收机以及分集组合接收机的BER的解析表达式。仿真结果验证了所推导的解析表达式。

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