Subcarrier allocation in a multiuser MIMO channel using linear programming

In this paper, we propose a solution to the subcarrier assignment problem in a high-rate channel-aware MIMO-OFDM system. Our model incorporates inter-stream interference of the MIMO channel. Optimization is applied to enforce efficient resource allocation in the presence of strict fairness constraints. Computational complexity of the optimization problem is reduced by approximating the original model with a modified model that has fewer decision variables. The proposed methods are shown to provide multi-user diversity gains.