基于改进贪婪类重构算法的物联网免授权多用户通信  

Grant-free Multi-User Communication in IoT Based on an Improved Greedy Reconstruction Algorithm

作　　者：王清江 WANG Qingjiang(Fujian Digital Fujian Cloud Computing Operation Co.,Ltd.,Fuzhou 350207,China)

机构地区：[1]福建省数字福建云计算运营有限公司,福建福州350207

出　　处：《无线电通信技术》2024年第4期625-630,共6页Radio Communications Technology

摘　　要：针对5G大规模机器类通信(massive Machine Type Communication, mMTC)场景连接数量多,信令开销少,延时低等需求,在mMTC的免授权非正交多址(Non-Orthogonal Multiple Access, NOMA)接入系统中,利用基于压缩感知的多用户检测(Compress Sensing based Multi-User Detection, CS-MUD)技术和基于Dice系数的快速正交正则回溯匹配追踪(Dice-based Backtracking Orthogonal Matching Pursuit, DBOMP)算法,提出基于Dice系数的快速正交正则回溯匹配追踪多用户检测(Dice-based Backtracking Orthogonal Matching Pursuit Multi-User Detection, DBOMP-MUD)算法。利用Dice系数进行用户稀疏度接入的相关度计算,在译码迭代过程中,正则化实现重构精度与复杂度的平衡。仿真结果表明,所提DBOMP-MUD在信息检测时兼顾了性能与效率,与传统的CS-MUD算法相比,性能增益大于1 dB,所提方案能更好地满足实际mMTC的传输时延和检测性能需求。This article proposes a Compress Sensing based Multi-User Detection(CS-MUD)technology in grant-free Non-Orthogonal Multiple Access(NOMA)uplink transmission system to meet the needs of massive Machine Type Communications(mMTC)scenarios with large number of connections and information requirement in 5G.To meet the requirement of low overhead and low latency and to improve the reconstruction efficiency and reconstruction accuracy of the traditional Multi-User Detection(MUD)algorithm,this paper proposes a Dice-based Backtracking Orthogonal Matching Pursuit Multi-User Detection(DBOMP-MUD)algorithm.This proposed method first uses a Dice coefficient instead of atomic inner product for correlation calculation from matching criteria in atom pre-selection stage.Secondly,backtracking is used to determine the atoms that minimizes the residual;finally,in each iteration.Regularization is adopted to find several atoms,which can balance reconstruction accuracy and efficiency.Simulation results show that the DBOMP-MUD algorithm proposed in this article takes into account both performance and efficiency during signal reconstruction.In the NOMA uplink transmission system reconstruction experiment,compared with the traditional CS-MUD algorithm,the signal-to-noise ratio gain can reach 1 dB,verifying the superiority of the proposed algorithm in NOMA uplink transmission system.Therefore,the proposed scheme can better meet the transmission delay and detection performance requirements in the practical mMTC.

关 键 词：大规模机器类通信 非正交多址 信号重构 压缩感知 多用户检测 

分 类 号：TN911.3[电子电信—通信与信息系统]