Abstract
In this paper, the problem of multi-user sub-carrier allocation by metric of channel gain in an OFDMA system is formulated as an assignment problem in order to investigate an optimal solution. An optimal channel sub-carrier allocation (OCSA) strategy (extension of Hungarian Method (1)) is proposed for fair bandwidth allocation and highest total perceived channel gain. Additionally, two sub-optimal algorithms are considered: One is an extension of the DSA algorithm in (2), the other is maximum gain sort-swap (MGSS) which is an extension of the algorithm in (3). The DSA algorithm is of particular interest since it has been shown in (5) to combine well with MIMO. The algorithms can outperform OFDMA with pseudo-random sub-carrier allocation by up to 6dB. Simulation results show that the DSA algorithm achieves perceived channel gains within a fraction of a dB of the optimal solution.
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