摘要
针对目前关于非正交多址接入(NOMA)的研究均局限于线性调制的问题,且考虑到实际系统中不完全的信道状态信息(CSI),基于最小频移键控类(MSK-type)调制,该文提出一种不完全CSI下的非线性波形NOMA系统。首先,分别采用过采样和匹配滤波技术对两用户的上行异步和同步系统进行了建模。进一步,基于矩阵分解理论和连续干扰消除(SIC)机制,分别推导出完全或不完全CSI下系统吞吐量达到最大时的发射功率和归一化时延。最后,数值仿真结果表明了完全与不完全CSI下系统吞吐量与帧长、响应长度、波形以及频率脉冲等系统参数的关系。
Focusing on problems of Non-Orthogonal Multiple Access(NOMA)that are limited to linear modulation,and considering the imperfect Channel State Information(CSI)in the actual system,this paper proposes a nonlinear waveform NOMA system under imperfect CSI based on Minimum Shift Keying type(MSK-type)modulations.First,two-user uplink asynchronous and synchronous system models are established using oversampling and matched filtering techniques.Furthermore,based on the matrix decomposition theory and Successive Interference Cancellation(SIC)mechanism,the transmit power and normalized delay when the system throughput reaches the maximum under perfect or imperfect CSI are derived.Finally,the numerical simulation results show the relationship between system throughput and system parameters such as frame length,response length,waveform,and frequency pulse under perfect and imperfect CSI.
作者
李赛
党小宇
虞湘宾
郝崇正
李杰
张俊
LI Sai;DANG Xiaoyu;YU Xiangbin;HAO Chongzheng;LI Jie;ZHANG Jun(College of Electronic Information Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China)
出处
《电子与信息学报》
EI
CSCD
北大核心
2022年第8期2749-2756,共8页
Journal of Electronics & Information Technology
基金
国家自然科学基金(62031017,61971221)
中央高校基本科研业务费(NP2020104)。
关键词
非正交多址接入
最小频移键控类调制
不完全信道状态信息
系统吞吐量
信道估计误差
Non-Orthogonal Multiple Access(NOMA)
Minimum Shift Keying(MSK)-type modulations
Imperfect Channel State Information(CSI)
System throughput
Channel estimation error
