Lower Bounds Optimization for Coordinated Linear Transmission Beamformer Design in Multicell Network Downlink
Abstract
We consider the coordinated downlink beamforming problem in a cellular network with the base stations (BSs) equipped with multiple antennas, and with each user equipped with a single antenna. The BSs cooperate in sharing their local interference information, and they aim at maximizing the sum rate of the users in the network. A set of new lower bounds (one bound for each BS) of the non-convex sum rate is identified. These bounds facilitate the development of a set of algorithms that allow the BSs to update their beams by optimizing their respective lower bounds. We show that when there is a single user per-BS, the lower bound maximization problem can be solved exactly with rank-1 solutions. In this case, the overall sum rate maximization problem can be solved to a KKT point. Numerical results show that the proposed algorithms achieve high system throughput with reduced backhaul information exchange among the BSs.
Cite
@article{arxiv.1111.6223,
title = {Lower Bounds Optimization for Coordinated Linear Transmission Beamformer Design in Multicell Network Downlink},
author = {Mingyi Hong and Alfredo Garcia and J. Joaquin Escudero Garzas and Ana Garcia-Armada},
journal= {arXiv preprint arXiv:1111.6223},
year = {2011}
}