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Uplink OFDMA resource allocation with discrete rates: optimal solution and suboptimal implementation
Author(s) -
Yaacoub Elias,
ElHajj Ahmad M.,
Dawy Zaher
Publication year - 2012
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.1518
Subject(s) - telecommunications link , orthogonal frequency division multiple access , mathematical optimization , frequency division multiple access , computer science , resource allocation , ergodic theory , discrete time and continuous time , orthogonal frequency division multiplexing , coding (social sciences) , power (physics) , mathematics , telecommunications , computer network , statistics , channel (broadcasting) , mathematical analysis , physics , quantum mechanics
Resource allocation in the uplink of orthogonal frequency‐division multiple access systems is investigated. The problem of ergodic utility maximisation with discrete rates is formulated and solved using dual Lagrangian techniques. Suboptimal algorithms based on equal power allocation over the subcarriers are proposed. Results are presented and compared for the continuous and discrete rates scenario, using both the optimal solutions and the suboptimal algorithms. Equal power allocation is shown to approximate well the optimal solution in the continuous rates case, as well as in the discrete rates scenario when the number of modulation and coding schemes increases. Copyright © 2011 John Wiley & Sons, Ltd.