Journal
IEEE TRANSACTIONS ON SIGNAL PROCESSING
Volume 57, Issue 7, Pages 2797-2808Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TSP.2009.2016246
Keywords
Dual decomposition; fairness; Nash bargaining solution; orthogonal-frequency-division multiple-access (OFDMA); polymatroids; space-division-multiple-access (SDMA)
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We propose algorithms for rate allocation in a multiuser orthogonal-frequency-division multiple-access (OFDMA) system, which aim to maximize the system throughput and maintain fairness among users. The system comprises of variable-rate users (with specified minimum rates) as well as constant-rate users communicating with a base station. Rate allocation criteria based on the Nash bargaining solutions are formulated. Proportional fair-rate allocation as well as fair-rate allocation in classical OFDMA systems with orthogonality constraints, are subsumed as special cases of our formulations. The resulting optimization problems, which also accommodate practical per-user power constraints, are solved using the dual decomposition techniques. The efficiencies of our proposed methods are demonstrated through simulation results.
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