Abstract
In order to overcome the limitation of narrow modulation bandwidth on the performance in the visible light communication (VLC) systems, non-orthogonal multiple access (NOMA) is applied to the downlink VLC networks in this paper to improve the sum rate performance effectively. We first propose an optimal power allocation strategy which is based on the multi-factor control (MFOPA), aiming to maximize the total system capacity subject to ensuring all users' quality of service (Qos) and fairness, as well as illumination requirements. The analytical results indicate that the proposed MFOPA could provide higher system sum rate and better user fairness as well as guarantee the Qos and eye safety of each user at the same time when compared with the static power allocation (SPA) and gain ratio power allocation (GRPA) schemes, especially in high demand for signal-to-interference-plus-noise ratio (SINR). What is more, considering the residual interference may exist during the successive interference cancellation (SIC) at the receiver, namely imperfect SIC, the interference cancellation factor is also taken into account in MFOPA strategy. The numerical results are shown to demonstrate the robustness and effectiveness of the MFOPA in NOMA-VLC when the residual interference remains.
Highlights
In recent years, visible light communication (VLC) has attracted more attention due to its advantages such as high rate and security, energy efficiency and license-free spectrum, which has been regarded as a potential compensatory technology of existing wireless communication technologies [1]
NUMERICAL RESULTS Monte-Carlo simulation is used to evaluate the performance of the proposed MFOPA strategy in non-orthogonal multiple access (NOMA)-VLC system
This paper investigates the power control problem for indoor downlink NOMA-VLC networks equipped with one light-emitting diode (LED) and multiple users
Summary
Visible light communication (VLC) has attracted more attention due to its advantages such as high rate and security, energy efficiency and license-free spectrum, which has been regarded as a potential compensatory technology of existing wireless communication technologies [1]. One of the main drawback in VLC is that the narrow modulation bandwidth of the light sources limits its rate performance. For this reason, many technologies such as adaptive modulation [2], multiple-input-multiple-output (MIMO) [3], [4], equalization technologies [5] and multiple access schemes [6], [7] have been proposed and studied to improve the data rates in VLC systems. Ority of resisting inter symbol interference (ISI), which can further improve the spectral efficiency [8]–[10] These two techniques cannot be directly used in VLC since the signals must be real and non-negative, which is limited by the illumination requirement and intensity modulation. DC-biasing and clipping schemes have been presented to adjust to OFDM and OFDMA, resulting in the decrease of the spectrum efficiency [11], [12]
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