Distributed Power Allocation for Interfering Wireless Links Based on Channel Information Partitioning

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Network-wide optimization of transmit power with the goal of maximizing the total throughput, promises significant system capacity gains in interference-limited data networks. Finding distributed solutions to this global optimization problem however, remains a challenging task. In this paper, the authors first focus on the maximization of the weighted sum-rate capacity, as this allows the incorporation of QoS criteria in the objective function. For the case of two links, they are able to analytically characterize the optimal solution to the weighted sum-rate maximization problem. However, computing the optimal solution requires centralized knowledge of network information. They thus formulate a framework for distributed power optimization valid for N mutually interfering links, based on the concept of channel state partitioning.