WLC36-4: Optimization of Multiuser MIMO Networks with Interference

Maximizing the total mutual information of a multiuser multiple-input multiple-output (MIMO) system with interference is a well-known and challenging problem. In this paper, we consider the power control problem of finding the maximum sum of mutual information for multiuser MIMO systems with equal power allocation at each link. A new and powerful global optimization method using a branch-and-bound framework coupled with the reformulation-linearization technique (BB/RLT) is introduced. The proposed BB/RLT is the first such method that guarantees finding a global optimum for multiuser MIMO systems with interference. In addition, we propose a modified branch-and-bound (BB) variable selection strategy to accelerate the convergence process, and apply the proposed technique to several MIMO systems in order to demonstrate its efficacy.