Collaborative Transmitters Management for Multi‐user Indoor VLC Systems

Abstract

AbstractThe main encounters face visible light communication (VLC) systems to provide high data rates for multiuser scenario are intersymbol interference (ISI) and cochannel interference (CCI). This work proposes delay adaptation technique (DAT) in conjunction with power adaptation technique (PAT) to improve the performance of the multiuser indoor VLC systems. The DAT is used to reduce the ISI while the PAT is utilized to reduce the CCI. To apply the DAT and PAT, each access point (AP) requires to share its information with the controller, which is responsible to manage the connection between user equipment (UEs) and APs. Therefore, each AP is given a control signal (an unmodulated unique tone signal). These control signals are utilized to set‐up the connection between APs and UEs (allocate each UE its best APs, which are APs that offer good connection links). Our proposed system performance is evaluated in a realistic room while considering the effect of diffuse reflections and CCI and using on‐off‐keying modulation. The results reveal that a remarkable improvement in the VLC system's performance with using DAT and PAD compared with the VLC system without using DAT and PAT.