在设备到设备通信的车联网场景(Vehicle to Everything-Device to Device,V2X-D2D)下,信道的快速时变会导致基站(Base Station,BS)端通常无法获取完美信道状态信息(Channel State Information,CSI).为解决现有频谱分配方案不适用于 V2X-D2D场景的问题,考虑车对车(Vehicle-to-Vehicle,V2V)链路可靠性、最大发射功率、频谱复用的约束,建立V2X的场景模型与通信模型.明确了在满足V2V链路可靠性的前提下,最大化车与基础设施(Vehicle to Infrastruc-ture,V2I)链路的遍历容量的优化目标;在考虑信道快速时变影响的情况下,推导V2V链路的中断概率、V2I链路遍历容量的闭式表达式;针对一对一模式和一对多模式下的频谱分配问题,分别提出基于改进匈牙利算法的快速频谱分配方案和基于图着色-偏好列表的频谱分配方案.仿真结果表明:与现有算法相比,基于改进匈牙利算法的快速频谱分配方案接入率更高、复杂度更低,基于图着色-偏好列表的频谱分配方案也具有接入率、频谱利用率高的优势.
V2X spectrum allocation scheme based on D2D communication with imperfect CSI
In Vehicle to Everything-Device to Device(V2X-D2D)communication scenarios,the rapid time-variation of channels often prevent the Base Station(BS)from acquiring perfect Channel State Information(CSI).To address the limitations that the existing spectrum allocation schemes are not applicable to V2X-D2D scenarios,considering constraints such as Vehicle-to-Vehicle(V2V)link reliability,maximum transmission power,and spectrum reuse,a scenario model and communication model for V2X scenarios are established.This study specifies the optimization objective of maximizing the ergodic capacity of Vehicle-to-Infrastructure(V2I)links while ensuring V2V link reliability.Closed-form expressions are derived for the outage probability of V2V links and the ergodic capacity of V2I links,accounting for the effects of channel time-variations.For spectrum allocation in one-to-one mode,a fast spectrum allocation scheme based on the improved Hungarian algorithm is proposed.For one-to-many mode,a spectrum allocation scheme based on graph coloring and preference lists is developed.Simulation results show that the improved Hungarian algorithm-based scheme achieves higher access rates and lower complexity compared to existing algorithms,while the graph coloring-preference list scheme offers superior access rates and spectrum utilization.
wireless communicationVehicle to Everything(V2X)Device to Device(D2D)spectrum allocationimperfect Channel State Information(CSI)
万方数据
维普
