A low-complexity zero-forcing   Beamformer   design for multiuser MIMO   systems  via   a  dual gradient method

Bin  Li; Hai Huyen  Dam; Antonio  Cantoni

doi:10.3934/naco.2016012

Article Contents

2016, Volume 6, Issue 3: 297-304. Doi: 10.3934/naco.2016012

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A low-complexity zero-forcing Beamformer design for multiuser MIMO systems via a dual gradient method

1.
Department of Mathematics and Statistics, Curtin University, GPO Box U1987, Perth, WA 6845
2.
School of Electrical, Electronic and Computer Engineering, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009

Received: March 2015

Revised: September 2016

Published: August 2016

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Abstract

In this paper, we consider the zero-forcing beamforming (ZFBF) under the per-antenna power constraints (PAPC). Our objective is to maximize the minimum user information rate. Traditionally, ZFBF under PAPC with a max-min performance measure can be transformed into a second order cone problem and then solved by applying the interior point method. However, it is expensive to realize this design in practice due to high computational complexity per iteration. An alternative low complexity zero-forcing beamformer design is proposed for MU-MIMO systems by applying a dual gradient method. Different from the step size rule in the literature, a backtracking line search is adopted. A numerical example is provided to show the effectiveness of the proposed method.

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Mathematics Subject Classification: Primary: 90B18; Secondary: 90C25.

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References

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