… 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 …

… In order to solve the joint beamforming and power allocation for each given user partition,
we first formulate the problem and conclude its nonconvexity. We then derive an equivalent …

… , a novel joint design of user clustering and multi-dimensional resource allocation based
on … Finally, we design a joint optimization of channel allocation and power allocation, which …

… method by jointly optimizing the user clustering, power management, and bandwidth allocation
such that … of all the users are satisfied. The contributions of the paper are listed as follows. …

… 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 …

… As a result, the enhancement of energy efficiency becomes a critical issue in NOMA …
user clustering strategy and power allocation design of downlink NOMA systems. The energy …

… is to jointly design the beamforming vectors, user clustering strategy and power allocation
in … , so as to minimize the total transmit power at the BS, subject to relevant SINR, power and …

… and transmission power. To solve the optimization problem, we first propose heuristic
algorithms to solve user clustering and resource allocation. Then, we propose an iterative power …

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

… However, FTPC is still applied for intra-cluster power allocation, which needs further
improvements. In this section, power allocation is optimized based on the optimal user clustering …