基于星座分解的非相干非正交多址大规模SIMO系统  

Non-coherent non-orthogonal multiple access massive SIMO system based on constellation decomposition

作　　者：倪传坤 李岩聪 王文洒 高向川[2] NI Chuankun;LI Yancong;WANG Wensa;GAO Xiangchuan(Xuji Electric Company Limited,Xuchang 461000,China;College of Electrical and Information Engineering,Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]许继电气股份有限公司,许昌461000 [2]郑州大学电气与信息工程学院,郑州450001

出　　处：《国外电子测量技术》2025年第1期73-80,共8页Foreign Electronic Measurement Technology

基　　金：河南省重点研发专项项目(231111212400);河南省科技攻关项目(232102211067);国家重点研发计划项目(2019QY0302)。

摘　　要：面向6G海量物联网中关键性机器类通信对高并发超可靠低延迟通信需求,利用大规模天线的高空间增益和信道间渐进正交特性,提出一种基于星座分解的高能效非相干非正交多址传输方案。针对三用户上行大规模单输入多输出(SIMO)系统,首先推导了快速的非相干最大似然检测器,避免复杂的信道估计和导频开销。然后根据给出的8-QAM联合星座,分解出BPSK或2-QAM混合调制的子星座分配给3个用户,用于在相同时-频资源上信号叠加传输提高系统频谱效率;最后基于最大化最小联合星座点之间欧氏距离和最小化系统总功耗准则对用户子星座和功率分配进行了联合优化设计,并对此连续-离散优化问题进行了有效求解。仿真结果表明所提方案均明显优于传统基准方案,其中所提混合调制子星座性能最佳,有效提高了系统可靠性且降低通信时延,为高并发超可靠低延迟苛刻通信提供了一种可行的解决方案。To meet the demands for high concurrency,ultra-reliable low-latency communication in critical machinetype communications within the context of massive IoT for 6G networks,and to reduce terminal access waiting time and power consumption,this paper proposes an energy-efficient non-coherent non-orthogonal multiple access(NOMA)transmission scheme leveraging the high spatial gain and channel asymptotic orthogonality of massive antennas.Specifically focusing on a three-user uplink massive single-input-multiple-output(SIMO)system,we initially derive a rapid non-coherent maximum likelihood detector to circumvent the complexities associated with channel estimation and pilot overhead.Subsequently,based on the provided 8-QAM joint constellation,we decompose a set of sub-constellations comprising BPSK or 2-QAM,allocated independently to the three users for overlapping signal transmission in both time and frequency resources.Finally,we optimize user sub-constellation and power allocation based on maximizing the minimum Euclidean distance between joint constellation points and minimizing total system power consumption,effectively tackling this continuous-discrete optimization problem.Simulations confirm that the proposed scheme outperforms traditional benchmarks.The hybrid modulation sub-constellation achieves optimal performance,leading to improved system reliability and reduced communication latency.This offers a viable solution for high-concurrency,ultra-reliable,low-latency communication.

关 键 词：非相干检测 大规模SIMO 非正交多址(NOMA) 差分调制 星座分解 

分 类 号：TP393[自动化与计算机技术—计算机应用技术] TN914.5[自动化与计算机技术—计算机科学与技术]