通信学报2024，Vol.45Issue(12)：1-15,15.DOI:10.11959/j.issn.1000-436x.2024207
STAR-RIS辅助的无源物联网上行和速率最大化研究:SDMA对比NOMA
Research on uplink sum-rate maximization for STAR-RIS assisted batteryless IoT:SDMA versus NOMA
摘要
Abstract
To address the limitations of half-space coverage,low information transmission efficiency of RIS assisted bat-teryless IoT,a STAR-RIS assisted transmission scheme was proposed.Specifically,a STAR-RIS was deployed between the batteryless device(BD)and the access point,facilitating the uplink information transmission from the BD to the access point,thereby achieving full-space network coverage of the BD.To further enhance energy transmission efficiency,energy beamforming was designed at the power station.To this end,the system sum-rate maximization problems for both space di-vision multiple access(SDMA)and non-orthogonal multiple access(NOMA)scenarios were investigated,with jointly opti-mization of the relection coefficients of the BD,the energy beamforming vector at the base station and the coefficient matri-ces of the STAR-RIS.For the SDMA scenario,an iterative algorithm based on the block coordinate descent(BCD)frame-work was proposed to solve the optimization problem.Similarly,to address the non-convexity of the optimization problem in the NOMA scenario,the objective function was transformed to simplify its solution,and another iterative algorithm based on the BCD framework was proposed.Numerical results show the superiorities of the proposed schemes over the benchmark schemes.Moreover,the utilization of the NOMA achieves better performance than the SDMA.关键词
无源物联网/反向散射通信/同时透射和反射可重构智能表面/多址接入/和速率最大化Key words
batteryless IoT/backscatter communication/STAR-RIS/multiple access/sum-rate maximization分类
信息技术与安全科学引用本文复制引用
陈沿明,吕斌,杨震,李飞..STAR-RIS辅助的无源物联网上行和速率最大化研究:SDMA对比NOMA[J].通信学报,2024,45(12):1-15,15.基金项目
国家自然科学基金资助项目(No.62271265,No.62071242) The National Natural Science Foundation of China(No.62271265,No.62071242) （No.62271265,No.62071242）
