Multiple-input multiple-output (MIMO) and multiple-input single-output (MISO) schemes have yielded promising results in free space optical (FSO) communications by providing diversity against fading of the received signal intensity. In this article, we have analyzed the probability of error performance of a muliple-input single-output (MISO) free-space optical channel that employs array(s) of detectors at the receiver. In this regard, we have considered the maximal ratio combiner (MRC) and equal gain combiner (EGC) fusion algorithms for the array of detectors, and we have examined the performance of these algorithms subject to phase and pointing errors for strong atmospheric turbulence conditions. It is concluded that when the variance of the phase and pointing errors are below certain thresholds, signal combining with a single array of detectors yields significantly better performance than a multiple arrays receiver. In the final part of the paper, we examine the probability of error of the single detector array receiver as a function of the beam radius, and the probability of error is minimized by (numerically) optimizing the beam radius of the received signal beams.

中文翻译：

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具有探测器阵列的自由空间光学MISO通信

多输入多输出（MIMO）和多输入单输出（MISO）方案通过提供对抗接收信号强度衰减的分集，在自由空间光（FSO）通信中产生了可喜的结果。在本文中，我们分析了错误执行概率多输入单输出（MISO）自由空间光通道，在接收器处采用检测器阵列。在这方面，我们考虑了最大比率合并器 （MRC）和 等增益合并器（EGC）融合算法用于探测器阵列，我们已经检查了这些算法在强大气湍流条件下受相位和指向误差影响的性能。结论是，当相位和指向误差的方差低于某些阈值时，与单阵列检测器组合的信号会比多阵列接收器产生明显更好的性能。在本文的最后部分，我们检查了单个检测器阵列接收器的误差概率与射束半径的关系，并且通过（数字方式）优化了接收信号射束的射束半径，将误差概率最小化。