The data rate on the order of gigabits per second of Free Space optical communication (FSO) system in turbulent channel suffers random fluctuations in the intensity and phase of the received signal. For mitigation of this effect, multiple input multiple output (MIMO-FSO) system performance with spatial diversity overatmospheric turbulence channels was considered in this work. Obtained results demonstrate that MIMO performance mitigation techniques have high link availability and reliability of

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... SO system under wide range of atmospheric turbulence conditions.Data rate enhances results are achieved without any bandwidth or power expansions and the bit error rate (BER) at the receiver is maintained below 10 −9. We assume intensity modulation and on-off keying with NRZ type and present the BER performance of single-input single-output (SISO-FSO), (2Tx × 2Rx) and (4Tx × 4Rx) (MIMO-FSO) configuration systems with (155 Mbps) over this channel model. Both techniques of FSO systems (SISO and MIMO techniques) have been implemented experimentally through two approaches, laboratory and real field prototypes. It has been observed for (MIMO-FSO) link that increasing the system speed was almost linearly with the number of transmitting units.