Wireless Communications Research Group, Faculty of Electrical & Electronics Engineering, Ton Duc Thang University, Ho Chi Minh City 700000, Vietnam.
Faculty of Electronics Technology, Industrial University of Ho Chi Minh City (IUH), Ho Chi Minh City 700000, Vietnam.
Sensors (Basel). 2020 Mar 24;20(6):1786. doi: 10.3390/s20061786.
The outage performance is a significant problem to implement the Cognitive Radio (CR) paradigm in the Vehicle to Everything (V2X) networks. Recently, more interest has focused on Non-Orthogonal Multiple Access (NOMA) in wireless-powered communication. In the conventional CR-enabled V2X-NOMA network, spectrum sensing and limited battery capacity at the Roadside Unit (RSU) may cause serious outage performance. In this study, RSU selection scheme is adopted. This paper presents an interesting model of a system with Simultaneous Wireless Information and Power Transfer (SWIPT) and a CR-enabled V2X-NOMA network. In the downlink, the RSU harvests wireless energy from Radio Frequency (RF) signals and senses the spectrum state at the same time. A CR-enabled V2X-NOMA system performance is presented by deriving exact expressions of outage probability of distant vehicles. In the overlay CR-enabled V2X-NOMA network, the constraints are transmit power and the number of designed RSU that make significant impacts on system performance. Simulation results show that the CR-enabled V2X-NOMA get benefits from energy harvesting and RSU selection scheme.
中断性能是在车对一切（V2X）网络中实现认知无线电（CR）范例的一个重大问题。最近，人们对无线供电通信中的非正交多址（NOMA）越来越感兴趣。在传统的启用 CR 的 V2X-NOMA 网络中，频谱感测和路边单元（RSU）的有限电池容量可能导致严重的中断性能。在本研究中，采用了 RSU 选择方案。本文提出了一种具有同时无线信息和功率传输（SWIPT）和启用 CR 的 V2X-NOMA 网络的系统的有趣模型。在下行链路中，RSU 从射频（RF）信号中收集无线能量，同时感测频谱状态。通过推导出远距离车辆的中断概率的精确表达式，给出了启用 CR 的 V2X-NOMA 系统性能。在覆盖式启用 CR 的 V2X-NOMA 网络中，约束条件是传输功率和设计的 RSU 数量，这对系统性能有重大影响。仿真结果表明，启用 CR 的 V2X-NOMA 从能量收集和 RSU 选择方案中受益。
