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On the decomposition method for distributed downlink beamforming in multi-cell systems
conference contributionposted on 2014-01-01, 00:00 authored by Jinho ChoiJinho Choi
In this paper, we consider the minimum power downlink beamforming problem for a multi-cell system using the decomposition method. Since this problem has coupled constrained, it may not be easy to solve. However, the dual problem can be decomposed and allows to derive a distributed iterative beamforming algorithm for a time-division duplexing (TDD) based multi-cell system. The resulting algorithm does not require any backhaul transmissions between base stations (BSs) through iterations. As a result, it can be seen that the iterative algorithm for distributed beamforming consists of per- cell beamforming and closed-loop power control from users to BSs in a multi-cell system.