… clustering problem, the number of possible user structures in … optimization of user clustering
and power allocation is not … In this section, the formulated power allocation problem is …

… This paper focuses on efficient user clustering strategy and power allocation design of
downlink NOMA systems. The energy efficiency maximization of downlink NOMA systems is …

… the users interference, we propose an efficient user clustering algorithm. Within a cluster, we
consider the user … we propose a user clustering algorithm exploiting the channel correlation …

… impact on the user grouping and power allocation problems. In … user clustering and power
allocation solutions for multi-user … that user grouping and power allocations in NOMA cluster(s) …

… Abstract—In this paper, energy-efficient power allocation (PA) is investigated for a multiple-…
) system with multiple users in a cluster. To ensure the quality of service (QoS) for the users, a …

… Therefore, we jointly optimize the user clustering, and power and channel allocation to
formulate the NOMA-based resource management problem, as shown below.(2) P 0 : argmin x i j …

… the beamforming vectors, user clustering strategy and power allocation in the above MIMO
… the total transmit power at the BS, subject to relevant SINR, power and clustering constraints. …

… A non-convex power allocation problem for 2-user MIMONOMA was formulated in [10] …
-user interference is the main obstacle for NOMA, efficient user clustering and power allocation …

… -NOMA system, user clustering and power allocation are jointly … user clustering and power
allocation and then feed the results back to the BS. In Case 1, CMs are partitioned into clusters …

… power allocation algorithm along with an efficient user clustering technique. Also, a comparison
among the proposed algorithm with and without user clustering … requirement of the user. …