An Iterative Resource Allocation Algorithm for Multiuser OFDM with Fairness and QoS Constraints

This paper looks at the problem of total power minimization in multiuser OFDM systems while maintaining individual fairness (rate) and QoS (BER) requirements. A practical and efficient subchannel, power and bit allocation algorithms is described, where an average-SNR approximation is used to substantially reduce complexity. The proposed algorithm guarantees improvement through each iteration and converges quickly to a stable suboptimal solution. Numerical results and complexity analysis show that the proposed algorithm offers beneficial performance improvement compared to existing approaches.