Minimizing Transmit Power in a Virtual-Cell Downlink With Distributed Antennas
The authors consider the problem of allocating transmit power in the downlink of a distributed wireless communication system. They account for the power used in both channel estimation and data transmission, with the objective of minimizing the overall transmitted power while satisfying specified Quality of Service (QoS) constraints to the mobile users. They consider both single user and multi-user power control optimization; the problem formulation for both cases lead to a non-convex program. They proposed solution strategies for both scenarios: For the single user case, a simple intuitive solution, where power is allocated to the antennas sequentially until the QoS constraint is satisfied, is presented.