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Overhead Reduction in Coordinated Beamforming for Multiuser MIMO-OFDM Systems with Limited Feedforward
Leonel SORIANO-EQUIGUA Jaime SANCHEZ-GARCIA Chan-Byoung CHAE Robert W. HEATH, Jr.
IEICE TRANSACTIONS on Communications
Publication Date: 2011/11/01
Online ISSN: 1745-1345
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
coordinated beamforming, MIMO-OFDM, feedforward overhead, subcarrier correlation,
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This letter proposes a method for choosing the best quantized beamforming vector that represents a subcarrier group, for coordinated beamforming in the downlink of multiuser multiple input multiple output-orthogonal frequency division multiplexing systems. The correlation between subcarriers is exploited for reducing the feedforward overhead, while maximizing the sum rate.