In this paper, we study the impact of correlation on the bit error rate (BER) and the channel capacity of a free-space optical (FSO) multiple-input-multiple-output (MIMO) system employing optical space shift keying (OSSK) over a fading channel. In order to study a practical correlated channel, we consider the effect of channel correlation due to both small-and large-scale eddies and show that the use of OSSK over correlated FSO channel can lead to an improved system performance with increasing correlation level of upto 0.9. In this work, we first develop an analytical framework for different performance metrics of the OSSK multiple-input single-output system with correlation and then extend our investigation by proposing an asymptotically accurate mathematical framework for MIMO. We also validate all the analytical results using MATLAB simulations. Finally, we develop an experimental setup of FSO with two correlated links to study the throughput and latency of the links at different turbulence levels.

中文翻译：

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信道相关性对基于 OSSK 的 FSO 系统不同性能指标的影响

在本文中，我们研究了相关性对采用光空间移位键控 (OSSK) 的自由空间光 (FSO) 多输入多输出 (MIMO) 系统的误码率 (BER) 和信道容量的影响通过衰落信道。为了研究实际的相关信道，我们考虑了由小规模和大规模涡流引起的信道相关的影响，并表明在相关 FSO 信道上使用 OSSK 可以提高系统性能，相关水平增加高达0.9. 在这项工作中，我们首先为具有相关性的 OSSK 多输入单输出系统的不同性能指标开发了一个分析框架，然后通过提出一个渐近精确的 MIMO 数学框架来扩展我们的研究。我们还使用 MATLAB 仿真验证了所有分析结果。