Scholarlink

<p>Free Space Optical (FSO) communication has proved to be a boon in wireless communication technology due to its various advantages over RF communication. In this manuscript, a dual-hop FSO downlink network with Non-Orthogonal Multiple Access (NOMA) scheme is considered in which mixed information from the base-station (BS) is first passed onto the relay node (R) and then employing amplify-and-forward (AF) protocol at R, the information is re-transmitted to user 1, U1 and user 2, U2 through Multi-Beam NOMA (MB-NOMA) technique. For modeling the impairments in FSO links, Gamma-Gamma turbulence fading and pointing errors are considered. Heterodyne detection (HD) is assumed at the receiver side in order to detect the incoming light signal. Closed-form expressions for capacity outage probability (COP) of the two users in terms of Meijer-G function are presented for the designed dual-hop FSO system and the results are analyzed with respect to various parameters and validated using Monte-Carlo simulations. Asymptotic results are also shown in order to provide an idea of the high SNR approximation of the derived expressions. The COP comparison is presented for intensity modulation with direct detection (IM/DD) and HD, as well as for NOMA and Orthogonal Multiple Access (OMA).</p>

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Investigation of Outage Performance in NOMA-based Dual-hop FSO Communication

  • 期刊论文

  • 发表日期：

    2025年3月1日

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  • Aanchal Gupta,
  • Divya Dhawan,
  • Neena Gupta,
  • Hemani Kaushal

摘要

Free Space Optical (FSO) communication has proved to be a boon in wireless communication technology due to its various advantages over RF communication. In this manuscript, a dual-hop FSO downlink network with Non-Orthogonal Multiple Access (NOMA) scheme is considered in which mixed information from the base-station (BS) is first passed onto the relay node (R) and then employing amplify-and-forward (AF) protocol at R, the information is re-transmitted to user 1, U1 and user 2, U2 through Multi-Beam NOMA (MB-NOMA) technique. For modeling the impairments in FSO links, Gamma-Gamma turbulence fading and pointing errors are considered. Heterodyne detection (HD) is assumed at the receiver side in order to detect the incoming light signal. Closed-form expressions for capacity outage probability (COP) of the two users in terms of Meijer-G function are presented for the designed dual-hop FSO system and the results are analyzed with respect to various parameters and validated using Monte-Carlo simulations. Asymptotic results are also shown in order to provide an idea of the high SNR approximation of the derived expressions. The COP comparison is presented for intensity modulation with direct detection (IM/DD) and HD, as well as for NOMA and Orthogonal Multiple Access (OMA).