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Investigation of Mixed RF/FSO Decode-and-Forward NOMA Cooperative Relaying Networks

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Abstract

An analytical study of the performance of a mixed radio frequency (RF)/free space optical communication (FSO) cooperative relaying system is presented in this research. A non-orthogonal multiple access (NOMA) strategy is studied in this paper. It has been anticipated that the relay node of the mixed RF/FSO system will operate in accordance with the decode-and-forward (DF) protocol, it has also been assumed that there is a direct link between the source and destination nodes. The RF links have been modeled using the Nakagami-\(m\) distribution, and assumed that the Malaga distribution has been used to mimic the atmospheric turbulence on the FSO link. When analyzing the FSO link model, it is important to consider the influence of pointing error as well as the type of optical demodulation system used, which includes intensity modulation direct detection and coherent demodulation. The analytical equations for the outage probability and ergodic capacity of the proposed NOMA network have been derived. To describe the derived results in terms of elementary functions, the outage analysis for the mixed RF/FSO DF system has been extended to include the particular situation of high signal-to-noise ratio conditions. RF and FSO system parameters were investigated in terms of their impact on the overall dependability and throughput offered by the system using the analytical methodology developed. Monte-Carlo simulation has been used to verify the numerical results that have been obtained.

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Data sharing not applicable to this article as no datasets were generated or analysed during the current study.

Abbreviations

\(h_{{12}}\) :

Fading coefficient of the \(S-R\) link

\(a_1, a_2\) :

Power coefficients

\(P_1\) :

RF power for transmitting symbol \(s_1\)

\(h_{{13}}\) :

Fading coefficient on the RF \(S-D\) link

\(P_2\) :

RF power for transmitting symbol \(s_2\)

\(s_1, s_2\) :

Symbols

\(g_{{23}}\) :

FSO link’s irradiance

\(P_F\) :

Optical power transmitted

\(r\) :

Type of optical demodulation scheme

\(n_{13}\) :

AWGN factor on \(S-R\) link

\(n_{23}\) :

AWGN factor on \(R-D\) link

\(n_{13}\) :

AWGN factor on \(S-D\) link

\(m_{1j}\) :

Nakagami-\(m\) fading parameter

\(\beta _{1j}\) :

\(\frac{m1j}{\bar{\gamma }_{1j}}\)

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  1. Department of Electronics and Communication Engineering, Ajay Kumar Garg Engineering College, Ghaziabad, India

    Abhijeet Upadhya

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Upadhya, A. Investigation of Mixed RF/FSO Decode-and-Forward NOMA Cooperative Relaying Networks. Wireless Pers Commun 124, 2923–2938 (2022). https://doi.org/10.1007/s11277-022-09496-2

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