电讯技术2017，Vol.57Issue(1)：9-13,5.DOI:10.3969/j.issn.1001-893x.2017.01.002
非正交多址技术中利用对称矩阵的用户分组
User Clustering Based on Symmetric Matrix in Non-orthogonal Multiple Access Technology
摘要
Abstract
In the non-orthogonal multiple access( NOMA) technology,the existing user clustering algorithm is achieved by judging the threshold value of channel similarity to get the candidate users firstly,and then the optimal grouping users are selected by comparing the channel gain-difference of the candidate grouping users. However,the threshold setting of channel similarity has a certain randomness which leads to inaccu-racy of the selection of candidate grouping users in the above multi-stage algorithm,and further affects the results of user clustering and improvement of system performance. In order to solve above problem,a user clustering algorithm using symmetric matrix in NOMA technology is proposed,wherein a nonlinear transfor-mation of channel similarity is performed,and then a new matrix which denotes channel state information of user channel similarity and user channel gian-difference is constructed. Furthermore,all the solutions of user clustering groups can be obtained by utilizing symmetry characteristic of matrix. Simulation results show that the proposed algorithm is better than the traditional algorithm by setting threshold value,and the system capacity is enhanced when the number of users is changed. When the threshold is 0. 95 in tradition-al algorithm,the system capacity is improved about 13. 4 Mb/s when the time of the number of users is 16 by using the proposed algorithm.关键词
非正交多址接入/用户分组/对称矩阵/系统性能Key words
non-orthogonal multiple access( NOMA)/user clustering/symmetric matrix/sum capacity分类
信息技术与安全科学引用本文复制引用
于中华,刘占军,沈悦,陈前斌..非正交多址技术中利用对称矩阵的用户分组[J].电讯技术,2017,57(1):9-13,5.基金项目
国家高技术研究发展计划(863计划)项目(2014AA01A701) （863计划）
