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The performance of coded and uncoded mixed single-hop RF links and multihop FSO link systems for the 5G centralized radio access network (C-RAN) is investigated in this paper using a coherent detection technique. A generalized Nakagami-m fading channel is chosen for the RF link, and the Gamma-Gamma distribution channel is chosen for the FSO link. The RF and FSO links use M-Quadrature Amplitude Modulated Orthogonal Frequency Division Multiplexing (M-QAM OFDM) modulation for the coherent detection scheme. The Meijer-G function is used to calculate outage probability (OP) and average symbol error rate (ASER) for analyzing the performance of coded and uncoded systems. Reed Solomon (RS) and Bose-Chaudhuri-Hocquenghem (BCH) codes are used in the coded system. In relays, the decode and forward (DF) method is used. For analysis, the effects of atmospheric turbulence, atmospheric loss, and pointing error are considered. The results show that the coding technique improves the system's performance. When compared to BCH codes, RS codes improve system performance more. A Monte-Carlo simulation is used to validate the analytical results.

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