Paper Info
Title
Fft-Based Block Diagonalization At User Terminal For Implicit Beamforming In Multiuser Mimo System
Abstract
This paper proposes Fast Fourier Transform (FFT) based orthogonal beam selection method at the user terminals (UTs) to reduce the number of nulls for the other users except an intended user by the Block Diagonalization (BD) algorithm in multiuser MIMO (MU-MIMO) sytems. The BD algorithm has been proposed in order to realize MU-MIMO broadcast transmission with a realistic signal processing burden. The BD algorithm cancels inter-user interference by creating the weights so that the channel matrixes for the other users are set to be zero matrixes. However, when the number of transmit antennas is equals to the total number of received antennas, the transmission rate by the BD algorithm is decreased. The proposed method realizes the performance improvement compared to the conventional BD algorithm without the burden on the UTs. It is verified via bit error rate (BER) evaluation that the proposed method is effective compared to the conventional BD algorithm and antenna selection method. Moreover, the effectiveness of proposed method is verified by the performance evaluation considering medium access control (MAC) layer in a comparison with the conventional BD algorithm which needs the channel state information (CSI) feedback. Because the proposed method can be easily applied to beamforming without the CSI feedback (implicit beamforming), it is shown that the propose method is effective from a point of view on the transmission efficiency in MU-MIMO system.
Year
DOI
Venue
2016
10.1587/transcom.2015ISP0019
IEICE TRANSACTIONS ON COMMUNICATIONS
Keywords
Field
DocType
multiuser MIMO, block diagonalization, FFT, implicit beamforming, IEEE802.11ac, eigenvalue
Beamforming,Computer science,MIMO,Theoretical computer science,Fast Fourier transform,Computer engineering,Eigenvalues and eigenvectors,Distributed computing
Journal
Volume
Issue
ISSN
E99B
1
0916-8516
Citations 
PageRank 
References 
0
0.34
10
Authors
4
Name
Order
Citations
PageRank
Hayate Kimoto100.34
Kentaro Nishimori216531.27
Takefumi Hiraguri34915.58
Hideo Makino45411.53