通信学报2025，Vol.46Issue(3)：151-163,13.DOI:10.11959/j.issn.1000-436x.2025052
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
摘要
Abstract
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 three-step 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 re-sults 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Key words
massive grant-free random access/spectrum sensing/non-orthogonal multiple access/access probability分类
电子信息工程引用本文复制引用
张晶,马林,高宏旭,陆音,吴烁雨,朱洪波..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[J].通信学报,2025,46(3):151-163,13.基金项目
国家重点研发计划基金资助项目(No.2020YFB1807202) （No.2020YFB1807202）
国家自然科学基金资助项目(No.92067201) （No.92067201）
江苏省重点研发计划基金资助项目(No.BE2020084-1) The National Key Research and Development Program of China(No.2020YFB1807202),The National Natural Science Foundation of China(No.92067201),Key Research and Development Program of Jiangsu Province(No.BE2020084-1) （No.BE2020084-1）
