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User Clustering Scheme for Downlink of NOMA System
( Li Li ),( Zhenghui Feng ),( Yanzhi Tang ),( Zhangjie Peng ),( Lisen Wang ),( Weilu Shao ) 한국인터넷정보학회 2020 KSII Transactions on Internet and Information Syst Vol.14 No.3
An improved clustering scheme based on user group is proposed. Every two users are grouped among N-users in the allowed system according to their link gain from large to small. Each user group is numbered sequentially. Two user clusters are obtained according to the principle of maximizing link gain difference for the users in the first and last user groups. The remaining user groups are added to the two existing user clusters according to the parity of the group number. The clustering should be clustered again among the users in either user cluster if the throughput summation of a user cluster in NOMA is less than that of these users in orthogonal multiple access. The simulation results show that the proposed clustering scheme can increase the system throughput by about 8% compared with the hybrid clustering scheme when the number of users requiring service is 12.