论文标题
5G细胞V2X通信的能源有效的NOMA多播系统与不完美的CSI通信
Energy-Efficient NOMA Multicasting System for 5G Cellular V2X Communications with Imperfect CSI
论文作者
论文摘要
车辆到全能（V2X）是一种现代的车辆技术，可改善交通和通信中的传统车辆系统。 V2X通信要求具有巨大的车辆连接和高移动性无线渠道，因此要求能效和高可靠性网络。非正交多访问（NOMA）是5G V2X服务的有前途解决方案，该服务旨在确保高可靠性，服务质量（QoS）供应和巨大的连接要求。在V2X中，检查不完美的CSI至关重要，因为车辆的高活动能力会导致更多的通道估计不确定性。与现有文献不同，我们建议用于5G蜂窝v2x通信的节能路边单位（RSUS）辅助NOMA多播系统，并研究节能能力分配问题。所提出的系统通过低复杂性最佳功率分配算法进行多播信息，该算法在通道中断概率约束下使用不完美的CSI，车辆的QoS限制以及RSUS的功率限制限制。通道中断概率约束的公式问题是一个非概率概率优化问题。通过放松将概率问题转化为非稳态问题，可以有效地解决此问题。
Vehicle-to-everything (V2X) is a modern vehicular technology that improves conventional vehicle systems in traffic and communications. V2X communications demand energyefficient and high-reliability networking because of massive vehicular connections and high mobility wireless channels. Nonorthogonal multiple access (NOMA) is a promising solution for 5G V2X services that intend to guarantee high reliability, quality-of-service (QoS) provisioning, and massive connectivity requirements. In V2X, it is vital to inspect imperfect CSI because the high mobility of vehicles leads to more channel estimation uncertainties. Unlike existing literatures, we propose energy-efficient roadside units (RSUs) assisted NOMA multicasting system for 5G cellular V2X communications, and investigate the energy-efficient power allocation problem. The proposed system multicast the information through low complexity optimal power allocation algorithms used under channel outage probability constraint of vehicles with imperfect CSI, QoS constraints of vehicles, and transmit power limits constraint of RSUs. The formulated problem with the channel outage probability constraint is a nonconvex probabilistic optimization problem. This problem is solved efficiently by converting the probabilistic problem through relaxation into a non-probabilistic problem.
