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首页> 外文期刊>Optoelectronics, IET >Performance improvement of FSO satellite downlink using aperture averaging and receiver spatial diversity
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Performance improvement of FSO satellite downlink using aperture averaging and receiver spatial diversity

机译：利用孔径平均和接收机空间分集提高FSO卫星下行链路的性能

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In this study, the bit error rate performance evaluation of a free space optical (FSO) satellite downlink has been carried out. Subsequently, improvement in performance using aperture averaging and receiver spatial diversity techniques have been explored. With a single large aperture receiver or an array of small aperture receivers, the scintillation index in the downlink can be reduced to a very small value. Moreover, a single receiver gives better performance than an array of receivers (employing equal gain combining) with the total area same as that of the single receiver. The expression of channel capacity with outage for the slow fading FSO channel has been derived using the log-normal and gamma–gamma channel models. Based on maximum acceptable outage probability, the minimum required signal-to-noise ratio is determined, from which the capacity with outage is calculated. It has been observed that the maximum achievable capacity per unit bandwidth increases and the corresponding outage probability reduces with an increase in the aperture diameter for a single receiver or with the size of the array for a receiver with spatial diversity.
机译：在这项研究中，已经进行了自由空间光（FSO）卫星下行链路的误码率性能评估。随后，已经探索了使用孔径平均和接收机空间分集技术来提高性能。使用单个大孔径接收器或小孔径接收器阵列，可以将下行链路中的闪烁指数降低到非常小的值。而且，单个接收器的性能要比一系列接收器（采用相等的增益合并）更好，并且总面积与单个接收器的总面积相同。使用对数正态和伽马-伽马信道模型可以得出慢衰落的FSO信道中断时信道容量的表示。根据最大可接受的中断概率，确定所需的最小信噪比，从而计算出中断的容量。已经观察到，对于单个接收器，随着孔径的增大，或者对于具有空间分集的接收器，随着阵列的大小，每单位带宽的最大可实现容量增加，并且相应的中断概率减小。

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