Power Allocation for Downlink Hybrid Power Line and Visible Light Communication System

Huanlin Liu,Meina Huang,Pingxin Zhu,Yong Chen

doi:10.1109/access.2020.2970097

Huanlin Liu, Meina Huang + Show 2 more

Open Access

https://doi.org/10.1109/access.2020.2970097

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Abstract

Light-emitting diode (LED)-based visible light communication (VLC) is a great promising high-speed wireless access solution due to its low power consumption, no electromagnetic interference, large available bandwidth, and no authentication required. However, visible light cannot be used directly as an information source, and must be combined with other communication technologies to avoid becoming an information island. In hybrid power line and visible light communication (HPV) system, power line communication (PLC) can be used to deliver data to VLC transmitters. Multiple users can share the same time and frequency resources to provide higher spectral efficiency using non-orthogonal multiple access (NOMA) method than traditional multiple access method. Therefore, we investigate the power allocation strategy for a downlink of HPV system based on NOMA. Our goal is to maximize achievable sum rate of the HPV system while considering user fairness. To solve this optimization problem, we present an optimal power allocation (OPA) algorithm that finds optimal solution by transforming the non-convexity of the original formulated model into the convex programming. Numerical results show that the proposed OPA algorithm significantly outperforms the gain ratio power allocation (GRPA) and the fixed power allocation (FPA) algorithm in terms of the sum rate, and improves the fairness among users.

Highlights

With the rapid development of Internet of Things, cloud computing and other technologies, traditional wireless communication will gradually fail to meet the increasing bandwidth demand of the market
In order to improve spectral efficiency, we study the power allocation scheme based on non-orthogonal multiple access (NOMA)
Comparing the proposed optimal power allocation (OPA) algorithm with Lagrangian algorithm using OFDM modulation technology, both algorithms are based on the Lagrangian dual method, we find a higher rate could be achieved using NOMA modulation technology compared to OFDM modulation technology, because all users can enjoy the entire time and frequency resources by using NOMA modulation technology

Summary

Introduction

With the rapid development of Internet of Things, cloud computing and other technologies, traditional wireless communication will gradually fail to meet the increasing bandwidth demand of the market. Compared with traditional radio frequency (RF) communication, visible light communication (VLC) has become a potential high-speed wireless access scheme because of its high transmission power, no electromagnetic interference, security and no need for spectrum authentication [1]. VLC becomes a key technology to replace RF [2]. Visible light cannot be a source of information directly, it is necessary to access the backbone network to avoid being an information isolated island. PLC and Ethernet links can be used as backbone networks. PLC seems a better choice because it can take advantage of the existing infrastructure of each light-emitting

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