BER performance of MIMO based NOMA‐VLC system with imperfect SIC

Abstract

AbstractIn this article, multiple‐input multiple‐output (MIMO) technique is employed with non‐orthogonal multiple access‐visible light communication (NOMA‐VLC) systems, namely MIMO‐NOMA‐VLC, to develop a low error and high data rate network. In particular, a multi‐user downlink MIMO‐NOMA‐VLC system with equal gain combiner (EGC) at the receiver is proposed. The on‐off keying (OOK) and L‐pulse position modulation (L‐PPM) is adopted for performance analysis. The imperfect successive interference cancellation (SIC) scenario is also considered to emphasize the practicability of the system. The closed‐form expressions for bit‐error‐rate (BER) of the proposed MIMO‐NOMA‐VLC system are derived with perfect and imperfect SIC. Specifically, two and three‐user scenarios are considered for detailed analysis. The MIMO‐NOMA‐VLC system with EGC combiner at the receiver completely outperforms the single‐input single‐output (SISO‐NOMA‐VLC) system. The proposed MIMO‐NOMA‐VLC system provides the best error performance at the power allocation co‐efficient assigned to far user of 0.3. Further, the error performance of the proposed MIMO‐NOMA‐VLC system is investigated for the system parameters such as diversity order, modulation order, user count and so forth. The derived analytical results are verified with the Monte‐Carlo simulation results.