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Decentralized Coordinated Downlink Beamforming via Primal Decomposition

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3 Author(s)
Harri Pennanen ; Centre for Wireless Commun. (CWC), Univ. of Oulu, Oulu, Finland ; Antti Tolli ; Matti Latva-aho

This letter considers the design problem of coordinated downlink minimum power beamforming for a multiuser multi-cell network, where each multi-antenna base station (BS) serves multiple single antenna users. We propose a decentralized primal decomposition based algorithm where limited amount of information is exchanged between coupled BSs at each iteration. Algorithm converges to the globally optimal solution for a static scenario. Unlike most of the previous decentralized methods, a feasible set of beamformers is guaranteed at each iteration even when the exchanged backhaul information is outdated. Consequently, the proposed approach naturally lends itself to realistic time-correlated fading scenarios.

Published in:

IEEE Signal Processing Letters  (Volume:18 ,  Issue: 11 )