Abstract

Recently the transmission of multiple radio frequency (RF) signals over fiber link, referred to as radio over fiber (RoF), has achieved a great deal of research interest. In case where deployment of optical fiber is not feasible, the new generation of free-space optical (FSO) systems can be used to transmit RF signals, that is referred to as radio over FSO (RoFSO). In this paper, we study the BER performance of a RoFSO system based on orthogonal frequency-division multiplexing (OFDM) scheme with quadrature amplitude modulation (QAM) when the optical beam is experiences the FSO link is affected by gamma-gamma atmospheric turbulence and misalignment errors (pointing errors). We derive a novel closed-form BER of the RoFSO M-QAM OFDM system, when both atmospheric turbulence and pointing errors.

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