Research Article
A Blind Post-FFT User-by-user Beamforming Algorithm for Multiuser OFDM Systems
@INPROCEEDINGS{10.1109/CHINACOM.2007.4469443, author={Xiang Chen and Chong-Yung Chi and Cheng-Wei Lin and Wing-Kin Ma and Shidong Zhou and Yan Yao}, title={A Blind Post-FFT User-by-user Beamforming Algorithm for Multiuser OFDM Systems}, proceedings={2nd International ICST Conference on Communications and Networking in China}, publisher={IEEE}, proceedings_a={CHINACOM}, year={2008}, month={3}, keywords={Array signal processing Delay Detection algorithms Diversity methods Diversity reception Fading OFDM Signal processing Signal processing algorithms Software performance}, doi={10.1109/CHINACOM.2007.4469443} }- Xiang Chen
Chong-Yung Chi
Cheng-Wei Lin
Wing-Kin Ma
Shidong Zhou
Yan Yao
Year: 2008
A Blind Post-FFT User-by-user Beamforming Algorithm for Multiuser OFDM Systems
CHINACOM
IEEE
DOI: 10.1109/CHINACOM.2007.4469443
Abstract
Recently, Peng and Chi et al. proposed a block-by-block blind post-FFT multistage beamforming algorithm (MSBFA) based on subcarrier averaging for a multiuser orthogonal frequency division multiplexing (OFDM) system, which works well under multipath block fading channels even in the presence of correlated paths. However, the MSBFA is a sequential path-by-path detection algorithm, thereby resulting in long detection latency as the total number of paths of all the active users is large. In this paper, a blind multistage user-byuser beamforming algorithm (UUBFA) is proposed, which, in contrast to the MSBFA, detects all the path signals for one individual user and meanwhile achieves the maximum diversity gain through a blind maximum ratio combining processing at each stage. In addition to achieving the same performance as the MSBFA, the parallel signal processing structure of the proposed UUBFA is well suited to software and hardware implementations.