Joint power control and beamforming for capacity improvement in wireless networks with antenna arrays

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Abstract
The interference reduction capability of antenna arrays and the power control algorithms have been considered separately as means to increase the capacity in wire- less communication networks. The minimum variance beamformer maximizes the Carrier to Interference Ra- tio (CIR) when it is employed in the receiver of a wire- less link. In a system with omnidirectional antennas, power control algorithms are used to maximize CIR as well. In this paper we consider a system with power control capabilities which uses antenna arrays at re- ceivers. An iterative algorithm is proposed to jointly update the transmission powers and the beamformer weights so that it converge to the jointly optimal beam- forming and transmission power vector. The algorithm is distributed and uses only local interference measure- ments. In an uplink transmission scenario it is shown how base assignment can be incorporated in addition to beamforming and power control such that a globally optimum solution is obtained. The network capacity increase and the saving in mobile power achieved by beamforming are evaluated through numerical study.

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