Abstract
A multi-cell visible light communication (VLC) network with non-orthogonal multiple access (NOMA) introduces an inter-cell interference (ICI), which causes poor experience of overlap-area user association. In this study, we focus on the strategic analysis of user association in multi-cell NOMA-VLC networks and reveal the relationship between the performance of user association and visible-light cell deployment. First, we establish the model of power-domain NOMA in multiple cells of VLC. Second, when the principle of proximity access (PPA) considers channel attenuation, we present the violation of the principle of proximity access (VPPA) based on signal-to-interference-plus-noise ratio (SINR) and derive a closed-form sufficient condition for overlap-area users based on the visible light channels. Third, based on the sufficient condition, we perform the strategic analysis of user association in two cases, i.e., the scenario probability with different numbers of users and the probability of the ratio of channel gains with an edge user are deduced. In addition, we evaluate the performance of user association by the deployment of lighting angles and inter-cell distance. Finally, the simulation results indicate that the VPPA achieves better data rate performance than the PPA based on the sufficient condition. Furthermore, the probability distributions in numerical results show that the situations with the VPPA reach a certain scale of occurrence probability.
Highlights
Visible light communication (VLC) [1] is an optical wireless communication technology for propagating the radio wave within the visible optical spectrum
Imperfect channel state information (CSI) that exists in the received signals is introduced by both inter-cell interference (ICI) and non-orthogonal multiple access (NOMA), which may be treated as interference or effective signals regarding to signal processing schemes
This paper focuses on the performance analysis of edge user association strategy in a NOMA-VLC network without the decrease of central user experience
Summary
Visible light communication (VLC) [1] is an optical wireless communication technology for propagating the radio wave within the visible optical spectrum. VLC networks perform line-of-sight (LOS) propagation of light to form directional coverage, which is a smaller cell compared with cellular radio frequency (RF) [1]. Owing to increasing inter-cell interference (ICI) in small VLC cells, optimizing transmit or receive strategies for multi-cell NOMA networks remains rather challenging [7]. Imperfect channel state information (CSI) that exists in the received signals is introduced by both ICI and NOMA, which may be treated as interference or effective signals regarding to signal processing schemes. User association, Tao et al EURASIP Journal on Wireless Communications and Networking (2020) 2020:80 the association of edge users within overlaparea users, focuses on the signal quality or received signal condition, which is affected by networking scenario, such as imperfect CSI and channel model
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
