Proportional Fair Based Subcarrier Allocation for OFDMA System with DF Relay

Bin FAN  Wenbo WANG  Yicheng LIN  Kan ZHENG  

IEICE TRANSACTIONS on Communications   Vol.E93-B    No.1    pp.187-191
Publication Date: 2010/01/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E93.B.187
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
relay,  decode-and-forward,  proportional fair,  OFDMA,  

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This paper considers the proportional fair (PF) based subcarrier allocation problem in a multihop orthogonal frequency division multiple access (OFDMA) broadcast system with decode-and-forward (DF) relays. The problem is formulated as a mixed binary integer programming problem with the objective to achieve proportional fairness among users and exploit the diversity provided by the independent frequency selective fading among hops. Since it is prohibitive to find the optimal solution, two efficient heuristic schemes are proposed. Simulation results indicate that with the same fairness performance, the proposed schemes achieve considerable capacity gain over the conventional PF scheduling method.