This letter investigates user selection and power allocation among users for an orthogonal frequency division multiplexing-based nonorthogonal multiple access scheme. We have proposed a low-complexity method for user selection by removing users who do not satisfy the derived condition. A closed form solution for optimal power allocation to the chosen users is derived by maximizing the weighted sum rate of the users. Results show that the proposed method achieves a performance similar to the optimal scheme employing exhaustive user search but with much lower complexity.
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Nain et al. (2017) studied this question.
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