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   Vol.E94-B    No.11    pp.3168-3171
Publication Date: 2011/11/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E94.B.3168
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.