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. 

Publication
IEICE TRANSACTIONS on Communications  Vol.E94-B  No.11  pp.3168-3171
Publication Date: 2011/11/01
Online ISSN: 1745-1345
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
Keyword: 
coordinated beamforming,  MIMO-OFDM,  feedforward overhead,  subcarrier correlation, 

Full Text: PDF(341.1KB)

Summary: 
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.