基于频谱感知和非正交多址的大规模免授权随机接入方案  

Spectrum sensing and non-orthogonal multiple access based massive grant-free random access scheme

作　　者：张晶[1,2] 马林 高宏旭[4] 陆音 吴烁雨[5] 朱洪波 ZHANG Jing;MA Lin;GAO Hongxu;LU Yin;WU Shuoyu;ZHU Hongbo(School of Communication and Information Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210003,China;Jiangsu Province Key Lab of Wireless Communications and Internet of Things,Nanjing 210003,China;Huawei Technologies Co.,Ltd.Nanjing Research Institute,Nanjing 210012,China;China Post Construction Technology Co.,Ltd.,Nanjing 210012,China;School of Portland,Nanjing University of Posts and Telecommunications,Nanjing 210023,China)

机构地区：[1]南京邮电大学通信与信息工程学院,江苏南京210003 [2]江苏省无线通信与物联网重点实验室,江苏南京210003 [3]华为技术有限公司南京研究所,江苏南京210012 [4]中邮建技术有限公司,江苏南京210012 [5]南京邮电大学波特兰学院,江苏南京210023

出　　处：《通信学报》2025年第3期151-163,共13页Journal on Communications

基　　金：国家重点研发计划基金资助项目(No.2020YFB1807202);国家自然科学基金资助项目(No.92067201);江苏省重点研发计划基金资助项目(No.BE2020084-1)。

摘　　要：针对大规模机器类型通信场景,提出一种基于认知无线电(CR)频谱感知和非正交多址(NOMA)的大规模免授权随机接入方案。首先,提出CR-NOMA三步免授权随机接入协议,支持终端用户通过频谱感知获取上行信道状态信息以便有针对性地降低随机接入冲突;然后,设计了基于频谱感知结果的接入信道和功率电平优选策略,建立了用户上行传输信号模型和基站接收信号模型;最后,提出了联合信道滤波、功率电平检测、前导和数据检测、冲突检测的多用户信号检测算法,对随机接入性能进行了理论分析和仿真。仿真结果表明,相比现有方案,所提CR-NOMA方案在系统高负载时用户接入概率和过载率提升了近一倍,过载能力更强,鲁棒性更好。A massive grant-free random access scheme based on spectrum sensing provided by cognitive radio(CR)and non-orthogonal multiple access(NOMA)was proposed for massive machine type communication scenarios.Firstly,a threestep grant-free random access protocol based on CR-NOMA was put up,which could support end users to obtain uplink channel state information through spectrum sensing so as to reduce random access conflicts in a targeted manner.Then,an access channel and power level optimization strategy according to spectrum sensing results was designed,and the uplink transmission signal model of users and reception signal model of base station were established.Finally,the multi-user signal detection algorithm with channel filtering,power level detection,preamble and data detection,as well as collision detection jointly was proposed.The performance of random access was theoretically analyzed and simulated,too.The simulation results show that,compared with existing solutions,the proposed CR-NOMA scheme has stronger overload capacity since it has nearly doubled the user access probability and overload rate under high system load.It also has better robustness.

关 键 词：大规模免授权随机接入 频谱感知 非正交多址 接入概率 

分 类 号：TN929.5[电子电信—通信与信息系统]