Distributed Margin Adaptive Resource Allocation in MIMO OFDMA Networks

This paper addresses the Margin Adaptive (MA) problem in MIMO OFDMA multi-cell networks. Resource allocation is distributed within each Base Station. Two cases are considered: full CSIT, and statistical CSIT. In both cases, a distributed convergence criterion for power control is determined and included within iterative power allocation. In the statistical CSIT case, an approximate analytical expression is obtained for the outage capacity, as a function of the SNR and the outage probability. It turns the MA problem into a convex optimization problem, and is valid at practical SNR and outage capacity values, for several antenna configurations. The proposed methods avoid power divergence situations at any load, and are consequently more efficient than iterative water-filling to solve the MA problem.