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Analysis of the performance of coded and un-coded mixed RF and multihop coherent OFDM-FSO systems for 5G-CRAN applications

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Abstract

The performance of coded and un-coded mixed single-hop RF links, as well as multihop FSO link systems, for the 5G centralized radio access network, 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. Both the RF and FSO links use M-quadrature amplitude modulated orthogonal frequency division multiplexing 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 un-coded systems. Reed solomon (RS) and bose-chaudhuri-hocquenghem codes are used in the coded system. In relays, the decode and forward 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 RS codes, BCH codes improve system performance more at low SNR. At high SNR and higher order code-word lengths, RS codes outperforms BCH and un-coded system. A Monte-Carlo simulation is used to validate the analytical results.

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Authors and Affiliations

  1. School of Electronics Engineering, Vellore Institute of Technology Chennai, Chennai, Tamilnadu, India

    K. Anbarasi, R. G. Sangeetha & C. Hemanth

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  1. K. Anbarasi
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  2. R. G. Sangeetha
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  3. C. Hemanth
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Correspondence to C. Hemanth.

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Anbarasi, K., Sangeetha, R.G. & Hemanth, C. Analysis of the performance of coded and un-coded mixed RF and multihop coherent OFDM-FSO systems for 5G-CRAN applications. Opt Quant Electron 54, 242 (2022). https://doi.org/10.1007/s11082-022-03603-0

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