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Nonorthogonal multiple access systems optimization to ensure maximum fairness to users
Author(s) -
Jacob Jaime L.,
Abrão Taufik
Publication year - 2020
Publication title -
transactions on emerging telecommunications technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.366
H-Index - 47
ISSN - 2161-3915
DOI - 10.1002/ett.3875
Subject(s) - maximization , telecommunications link , computer science , mathematical optimization , power (physics) , single antenna interference cancellation , max min fairness , interference (communication) , parameterized complexity , maximum power principle , point (geometry) , channel (broadcasting) , real time computing , computer network , mathematics , resource allocation , algorithm , physics , geometry , quantum mechanics
Abstract In this contribution, the optimization of power proportion allocated for each user in the downlink (DL) nonorthogonal multiple access (NOMA) systems have been developed. Successive interference cancellation technique recovers users' signal with high difference between channel gains, to find the lowest optimum power proportion required to guarantee an equal data rate for all active users. Following the same approach, the optimum power proportion for each user and also the minimum total power to achieve the same rate for all users (maximum fairness) were obtained as a design goal. Moreover, the same design methodology was developed seeking to maximize the NOMA system energy efficiency (EE). It was possible to find the maximum EE point and the respective power distribution among the users for a certain circuitry power consumption. For all NOMA users, in which the optimal operation point for EE maximization was parameterized, it was possible to find the total power, power ratio, and the equal rate values. As a result, one can find the trade‐off point between EE and sum rate for each system scenario, as well as the best resource efficiency operation point. By considering the same rate for all users, the system attains maximum fairness among the users.