Adaptive Power Allocation Scheme for Mobile NOMA Visible Light Communication System

Abstract

Recently, due to its higher spectral efficiency and enhanced user experience, non-orthogonal multiple access (NOMA) has been widely studied in visible light communication (VLC) systems. As a main concern in NOMA-VLC systems, the power allocation scheme greatly affects the tradeoff between the total achievable data rate and user fairness. In this context, our main aim in this work was to find a more balanced power allocation scheme. To this end, an adaptive power allocation scheme based on multi-attribute decision making (MADM), which flexibly chooses between conventional power allocation or inverse power allocation (IPA) and the optimal power allocation factor, has been proposed. The concept of IPA is put forward for the first time and proves to be beneficial to achieving a higher total achievable data rate at the cost of user fairness. Moreover, considering users’ mobility along certain trajectories, we derived a fitting model of the optimal power allocation factor. The feasibility of the proposed adaptive scheme was verified through simulation and the fitting model was approximated to be the sum of three Gaussian functions.

On The Selection of Power Allocation Strategy in Power Domain Non‐Orthogonal Multiple Access (PD‐NOMA) for 6G and Beyond

“…If SIC does not work properly, NU will suffer from a residual interference in case of CPA, while in IPA FU who will suffer from the residual interference. Thus, IPA increases the sum‐rate capacity more than CPA on the expense of reducing the users' fairness, as the NU rate is the dominant component in the sum‐rate capacity 58 . These facts can be proved by using Figures 4 and 5.…”

A Survey of NOMA for VLC Systems: Research Challenges and Future Trends

“…Introduce an adaptive power allocation scheme that chooses between GRPA or inverse power allocation (IPA) and the optimal power allocation factor to increase the achievable rate using multiattribute decision making (MADM) [64] 1 VLC AP + K users KKT conditions for optimality Sum rate Introduce a joint PLC-VLC power allocation scheme that outperforms FPA and NGDPA in terms of sum rate [65] 1 VLC AP + K users…”

Visible Light Communication and Positioning: Present and Future

“…In [20], the light-to-frequency converter for VLC is characterized. In [21,22], the physical-layer non-orthogonal multiple access and multi-color VLC, respectively, are addressed. In [23], the system-level VLC based on the software-defined radio with intelligent transportation and indoor applications is addressed.…”