On the Performance of MIMO-NOMA-Based Visible Light Communication Systems

TLDR

The letter applies non‑orthogonal multiple access to enhance the achievable sum rate of multi‑user MIMO‑based visible light communication systems. They propose a normalized gain difference power allocation scheme that uses users’ channel conditions for efficient, low‑complexity power allocation, and evaluate a 2×2 MIMO‑NOMA VLC system through numerical simulations. Results show that NOMA with NGDPA boosts the sum rate by up to 29.1% compared to NOMA with gain‑ratio power allocation in a 2×2 MIMO‑VLC system with three users.

Abstract

In this letter, we apply the non-orthogonal multiple access (NOMA) technique to improve the achievable sum rate of multiple-input multiple-output (MIMO)-based multi-user visible light communication (VLC) systems. To ensure efficient and low-complexity power allocation in indoor MIMO-NOMA-based VLC systems, a normalized gain difference power allocation (NGDPA) method is first proposed by exploiting users' channel conditions. We investigate the performance of an indoor 2×2 MIMO-NOMA-based multi-user VLC system through numerical simulations. The obtained results show that the achievable sum rate of the 2×2 MIMO-VLC system can be significantly improved by employing NOMA with the proposed NGDPA method. It is demonstrated that NOMA with NGDPA achieves a sum rate improvement of up to 29.1% compared with NOMA with the gain ratio power allocation method in the 2 × 2 MIMO-VLC system with three users.