Optimal Power Allocation Scheme Based on Multi-Factor Control in Indoor NOMA-VLC Systems
Optimal Power Allocation Scheme Based on Multi-Factor Control in Indoor NOMA-VLC Systems
复制标题
室内NOMA-VLC系统中基于多因素控制的最优功率分配方案
DOI：
10.1109/access.2019.2924027
复制
发表时间：
2019-01-01
期刊：
影响因子：
3.9
通讯作者：
Dong, Zanyang
中科院分区：
文献类型：
--
作者：
Li, Qian;Shang, Tao;Dong, Zanyang
为了克服可见光通信（VLC）系统中调制带宽窄对系统性能的限制，将非正交多址接入（NOMA）技术应用于下行VLC网络，有效地提高了系统的和速率性能。首先提出了一种基于多因素控制的最优功率分配策略（MFOPA），在保证用户服务质量（Qos）和公平性以及光照要求的前提下，使系统总容量最大化。分析结果表明，与静态功率分配（SPA）和增益比功率分配（GRPA）方案相比，MFOPA方案能够提供更高的系统和速率和更好的用户公平性，同时保证每个用户的QoS和眼睛安全，尤其是在对信干噪比（SINR）要求较高的情况下。此外，考虑到在接收机处的连续干扰消除（SIC）期间可能存在残余干扰，即不完美的SIC，在MFOPA策略中还考虑了干扰消除因子。数值结果表明，在NOMA-VLC中的MFOPA的鲁棒性和有效性时，残留的干扰。
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.