Visible light communication performance using MIMO‐ADO‐OFDM system

Visible light communications (VLC) and optical orthogonal frequency division multiplexing (O‐OFDM) have recently been identified as hopeful wireless techniques. Asymmetrically clipped DC‐biased O‐OFDM (ADO‐OFDM) is a modern performance enhancement technology used in VLC. This article proposes a performance improvement model using a novel approach that collaborates with ADO‐OFDM and multiple‐input multiple‐output (MIMO) in different design scenarios. In the first scenario, the bit‐error‐rate (BER) performance improvement is examined using different setups of MIMO‐ADO‐OFDM with maximal ratio combining (MRC). 8 × 8 MIMO good performance can be attained with about 15 dB signal‐to‐noise ratio for BER = 10−4. Another scenario is to boost the spectral efficiency of MIMO‐ADO‐OFDM by employing spatial multiplexing (SMX). However, 8 × 8 MIMO with SMX can improve spectral efficiency eight times that of single‐input single‐output ADO‐OFDM by fragmenting source data into numerous independent data streams. In the last scenario, multi‐user MIMO is developed by adopting ADO‐OFDM with zero‐forcing equalisers, allowing each user to consume all available bandwidth. The proposed technologies are evaluated by comparison with other MIMO systems, different O‐OFDM, and under a non‐linear LED model.