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This letter investigates power allocation for a downlink non-orthogonal multiple access system with a base station and two users. We first formulate an optimization problem for the single-input single-output (SISO) case in terms of power allocation between two users for maximizing the sum capacity under a total power constraint and a quality-of-service condition that the minimum rate requirement of...
In this paper, we first consider a downlink multiple- input multiple-output non-orthogonal multiple access (MIMO-NOMA) system with a base station and four users, where the users are equally divided into two clusters and inter-cluster interference is induced in transmission. Then we propose a joint clustering and precoding algorithm for the system such that not only the inter-cluster interference can...
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