A Hybrid Combination of OMA and NOMA for Integrated VLC-RF System

The current paper proposes a hybrid OMA-Co-operative-NOMA (HOCN) scheme that unifies visible light communication and radio frequency (RF) systems by utilising the perfectly synchronised Wireless Information and Power Transfer (SWIPT) technique. The NOMA employs successive interference cancellation, a computationally demanding task that shortens battery life. As a result, in a cooperative system, an energy harvesting scheme SWIPT is also implemented to ensure that near users have enough power to relay data to far users. The achievable rate of users is the metric used to quantify the performance in this work. The proposed HOCN system's performance has been compared to that of the SC-NOMA and TDMA systems using a range of user pairings, including near-far, near-near, and far-far (N-F, N-N, F-F). Furthermore, the impact of various field of view (FOV - 40
⁰
& 60
⁰
) combinations of near and distant user with varying LED semi-angles has been investigated. Using different LED transmit powers, the impact of power harvesting efficiency on the far user rate as well as the sum rate has been examined. The results show that proposed HOCN system is better option as it requires less transmitted power as well as smaller optical attocell.