南京邮电大学学报（自然科学版）2025，Vol.45Issue(2)：13-19,7.DOI:10.14132/j.cnki.1673-5439.2025.02.002
联合功率域与码域NOMA-OTFS系统研究
Research on joint power domain and code domain NOMA-OTFS systems
摘要
Abstract
Orthogonal time frequency space(OTFS)modulation is a new candidate waveform for 6G thanks for its reliable communication in high-mobility scenarios.High mobility scenarios,in turn,need to consider high spectrum efficiency to better meet the requirements of future 6G.However,the existing power domain non-orthogonal multiple access OTFS(PD-NOMA-OTFS)and code domain NOMA-OTFS(named SCMA-OTFS)systems have the problems of low sum rate,low overload rates of users/resources and meager users that can be supported.In order to solve these problems,the joint power domain and code domain NOMA-OTFS(called PD-SCMA-OTFS)system is proposed.At the transmitting terminal,the system divides users into the strong and the weak groups according to the channel gains.The users within a group are superimposed by the traditional SCMA,and the users between the two groups are su-perimposed by the power domain NOMA.On the receiving terminal,the message passing algorithm(MPA)and serial interference cancellation(SIC)are used for joint detection.Finally,different systems are compared,and the results show that the proposed system has a higher sum rate and the overload rate that is 1.5 to 2 times that of the traditional SCMA-OTFS and PD-NOMA-OTFS systems,and it can sup-port 1.2 to 6 times as many users as the traditional system.关键词
正交时频空/功率域非正交多址接入/稀疏码多址接入/和速率/过载率Key words
orthogonal time frequency space(OTFS)/power domain non-orthogonal multiple access(PD-NOMA)/sparse code multiple access(SCMA)/sum rate/overload rate分类
电子信息工程引用本文复制引用
周围,陈黎,向曾,黎飞雨,余明明..联合功率域与码域NOMA-OTFS系统研究[J].南京邮电大学学报（自然科学版）,2025,45(2):13-19,7.基金项目
国家自然科学基金(61701062)和重庆市基础与前沿研究计划(cstc2019jcyj-msxmX0079)资助项目 （61701062）
