南京邮电大学学报（自然科学版）2025，Vol.45Issue(5)：42-49,8.DOI:10.14132/j.cnki.1673-5439.2025.05.005
RIS辅助的NOMA-MEC系统时延最小化问题研究
Minimized delay of the RIS-assisted NOMA-MEC system
摘要
Abstract
Mobile edge computing(MEC)and reconfigurable intelligent surface(RIS)are two highly promising key technologies in future wireless communications,dedicated to enhancing the computational capabilities of communication systems and optimizing channel transmission performance,respectively.To address the problem of minimizing the task delay in a multi-user non-orthogonal multiple access(NOMA)-MEC network,RIS is deployed to improve the communication performance,enabling multiple users to offload tasks simultaneously through the same frequency band.We jointly optimize the RIS phase shift,offloading power,beamforming,and distribution factors,and design an equalizer at the receiving end.Since the problem is non-convex,the semidefinite relaxation(SDR)algorithm is used to optimize the phase shift of RIS,the successive convex approximation(SCA)algorithm is used for the power and allocation factors,the equalizer is designed by the minimum mean square error(MMSE)criterion,and the delay is minimized by the alternating optimization.关键词
智能超表面/非正交多址/移动边缘计算/时延Key words
reconfigurable intelligent surface(RIS)/non-orthogonal multiple access(NOMA)/mobile edge computing(MEC)/delay分类
信息技术与安全科学引用本文复制引用
徐宇欣,王鸿..RIS辅助的NOMA-MEC系统时延最小化问题研究[J].南京邮电大学学报（自然科学版）,2025,45(5):42-49,8.基金项目
国家自然科学基金(62171237)和江苏省自然科学基金(BK20231285)资助项目 （62171237）
