Subchannel, Bit and Power Allocation in Multiuser Ofdm Systems for Goodput Optimization with Fairness

This paper proposes a two-step method to maximize the goodput transmitted by the base station in multiuser orthogonal frequency division multiplexing systems based on subchannel, bit and power allocation. The problem is formulated as a binary integer programming (BIP) problem, in which the utility function to be optimized is modified with a fairness parameter. The application of the proposed method leads to a less complex BIP problem that is solved optimally by a branch-and bound algorithm. We further propose a suboptimal rounded linear programming algorithm that significantly reduces the complexity and does not sacrifice much performance.