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In this paper a novel multi-hop relay-assisted hybrid Free Space Optical /Radio Frequency (FSO / RF) communication system is presented, in which a mobileuser is connected to the Base Station via a multi-hop relay-assisted hybrid FSO/ RF link with receive diversity. In this structure, received signal at eachrelay is demodulated and forwarded. This is the first time that in a multi-hophybrid FSO / RF system, receive diversity is used. Bit Error Rate (BER) andOutage Probability (P_out) are investigated as system performance criteria. Newexact and asymptotic expressions are derived for these criteria, and MATLABsimulations are provided to verify the obtained results. For the first timeimpact of number of receive antennas and number of relays on the performance ofsuch a structure is investigated. Results indicate that proposed structure haslow dependence on number of receive antennas; therefore, in the proposedstructure use of single receive antenna has the same performance as themulti-antenna, while low complexity and power consumption. The proposedstructure shows independent performance at moderate and strong atmosphericturbulence regimes. Hence, it does not require adaptive processing to matchitself according to atmospheric turbulence condition, therefore is costeffective and particularly suitable for urban areas that encounter frequentchanges in atmospheric turbulence.

New expressions on the performance of a novel multi-hop relay-assisted hybrid FSO / RF communication system with receive diversity