2023年9月JournalonCommunicationsSeptember2023第44卷第9期通信学报Vol.44No.9可重构智能反射面辅助的车联网资源分配算法研究陈发堂,张若凡(重庆邮电大学通信与信息工程学院,重庆400065)摘要:面对车辆通信对通信质量和频谱效率的更高要求,提出了一种可重构智能反射面(RIS)辅助的车联网资源分配算法。联合考虑RIS反射系数矩阵、功率分配和频谱共享方案,在确保V2V链路的可靠性条件下,建立一个V2I链路总容量最大化问题。由于该问题是一个变量之间高度耦合的非凸优化问题,难以直接求解。因此,在引入解析表达式近似V2V链路的中断概率后,利用块坐标下降(BCD)法将此问题分解为3个子问题,并通过引入辅助变量、逐次凸逼近(SCA)、匈牙利算法等对子问题进行求解,进而得到问题的近似次优解。仿真结果表明,所提算法具有良好的收敛性能,并能够有效地提高V2I链路总容量。关键词:车联网通信;可重构智能反射面;资源分配;块坐标下降中图分类号:TN929.5文献标志码:ADOI:10.11959/j.issn.1000−436x.2023145ResearchonIoVresourceallocationalgorithmassistedbyreconfigurableintelligentsurfaceCHENFatang,ZHANGRuofanSchoolofCommunicationandInformationEngineering,ChongqingUniversityofPostsandTelecommunications,Chongqing400065,ChinaAbstract:Inordertomeetthehigherrequirementsofvehiclecommunicationqualityandspectralefficiency,aIoVre-sourceallocationalgorithmassistedbyreconfigurableintelligentsurface(RIS)wasproposed.TheRISreflectioncoeffi-cientmatrix,powerallocation,andspectrumsharingschemeswerecombinedtosolvetheproblemofmaximizingtheto-talcapacityofV2IlinkundertheconditionofensuringthereliabilityofV2Vlink.Asthisproblemwasanon-convexop-timizationproblemwithhighlycoupledvariables,itwasdifficulttosolveitdirectly.Therefore,afterintroducinganana-lyticexpressiontoapproximatetheinterruptprobabilityofV2Vlink,theproblemwasdecomposedintothreesub-problemsbyusingtheblockcoordinatedescent(BCD)method,andthesub-problemsweresolvedbyintroducingauxiliaryvariables,successiveconvexapproximation(SCA),Hungarianalgorithm,etc.,andthentheapproximatesubop-timalsolutionoftheproblemwasobtained.Simulationresultsshowthattheproposedalgorithmhasgoodconvergenceperformanceand...