… and downlink NOMA systems and their respective impact on the user grouping and … user
clustering and power allocation solutions for multi-user uplink and downlink NOMA systems…

… , while time-division multiple access (TDMA) schemes are utilized … and decoupled into user
clustering and power allocation … user clustering problems with user-based and cluster-based …

… This paper adopts the user-centric clustering scheme … clustering schemes, and proposes
joint clustering, user scheduling and beamforming designs for the downlink C-RAN with user…

… multiple access scenario is considered. We investigate a dynamic user clustering problem
… different tradeoffs of complexity and throughput of the worst user. In addition, for each given …

… This paper focuses on efficient user clustering strategy and power allocation design of … We
perform analysis for user clustering results and apply a clustering strategy to group users with …

… practical systems with a … user clustering scheme for downlink MIMO-NOMA system. The
proposed scheme exploits the channel gain differences and correlations among the NOMA users…

… user clustering and power allocation for an NOMA system … cluster, we propose a suboptimal
solution—the quality-balanced clustering approach to optimize the total sum rate in a system…

… users’ spatial distributions in mmWave NOMA-based system, we introduce unsupervised
learning method into user clustering… For resource optimization, a hybrid multiple access system, …

… the proposed user clustering method in fixed user scenario. To … art user clustering methods,
including the cluster-head-based clustering method in [12], and the status sort-based cluster…

… CONCLUSION In this paper, a two-stage user clustering algorithm has been proposed
based on proportional fairness for downlink NOMA-ZFBF system PF-NOMA-ZFBF in order to …