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An Efficient Algorithm for Zero-Forcing Coordinated Beamforming
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- Authors
- Haksoo Kim, Heejung Yu, Youngchul Sung, Yong H. Lee
- Issue Date
- 2012-07
- Citation
- IEEE Communications Letters, v.16, no.7, pp.994-997
- ISSN
- 1089-7798
- Publisher
- IEEE
- Language
- English
- Type
- Journal Article
- Abstract
- The problem of beam tracking for zero-forcing coordinated beamforming in multiple-cell time-varying multiple-input multiple-output channels is considered. Based on null-space perturbation theory, an efficient update algorithm for block-diagonalization-based zero-forcing coordinated beam design is proposed and its performance is analyzed. In slowly-varying channels, the proposed algorithm well tracks the zero-forcing beam solution and significantly reduces computational complexity by simply updating beamforming matrices instead of redesigning them with new channel state information at each time step. © 2012 IEEE.
- KSP Keywords
- Beam design, Channel State Information(CSI), Computational complexity, Coordinated beamforming, Efficient algorithms, Multiple input multiple output(MIMO), Null-space, Perturbation theory(PT), Time step, Update algorithm, beam tracking