Abstract
This paper introduces a multiple-input multiple-output (MIMO) free space optical (FSO) communication system with both transmit and receive diversity employing Alamouti space–time block-coding (STBC) at the transmitter end and switch-and-examine combining (SEC) at the receiver end, and presents analytical expressions for various performance measures of the system such as outage probability, bit-error-rate (BER) and capacity. The effects of the atmospheric turbulence over FSO link is modelled by the newly introduced Málaga distribution which serves as a general statistical model and covers most of the earlier statistical characterizations as special cases. For the computation of the performance metrics we propose a new unified analytical framework which yields closed-form expressions. The framework is also useful in finding switching threshold values that achieve the optimum performance for the proposed MIMO FSO system. The presented graphical plots exhibit that the corresponding Monte-Carlo simulations validate the derived analytical results for each of the considered metrics.
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