DocumentCode :
69831
Title :
Robust Multi-Antenna Multi-User Precoding Based on Generalized Multi-Unitary Decomposition With Partial CSI Feedback
Author :
Wee Seng Chua ; Chau Yuen ; Yong Liang Guan ; Chin, Francois
Author_Institution :
Nanyang Technol. Univ., Singapore, Singapore
Volume :
62
Issue :
2
fYear :
2013
fDate :
Feb. 2013
Firstpage :
596
Lastpage :
605
Abstract :
In this paper, we present a novel matrix decomposition method, called generalized multi-unitary decomposition (GMUD), and use it to achieve robust multi-antenna multi-user multiple-input-multiple-output (MIMO) precoding with limited and partial channel information feedback. GMUD transforms complex matrix {H} into H = Pθ, rRrQθ,rH, where Rr is a lower triangular matrix, and Pθ, r and Qθ, r are unitary matrices. A unique feature of GMUD is that it gives multiple solutions of the unitary matrices Pθ, r and Qθ, r based on two parameters, namely the direction parameter θ and magnitude parameter r. This property enables the GMUD precoder to steer the precoding vectors of different users to jointly optimize their performance. Compared with regularized-inverse precoding (an existing multi-user MIMO precoding technique that we have extended to handle multiple receive antennas), the advantages of GMUD precoding are that it requires only partial channel state information (CSI) from the users, and its performance is robust to CSI quantization.
Keywords :
MIMO communication; antenna arrays; codecs; feedback; precoding; receiving antennas; telecommunication channels; CSI; CSI quantization; GMUD precoder; GMUD transforms complex matrix; MIMO precoding; channel state information; generalized multiunitary decomposition; matrix decomposition method; multiple receive antennas; multiple-input-multiple-output; multiuser MIMO precoding technique; omulti-user MIMO precoding; partial CSI feedback; partial channel information feedback; robust multiantenna multiuser MIMO; robust multiantenna multiuser precoding; triangular matrix; Interference; MIMO; Matrix decomposition; Receiving antennas; Signal to noise ratio; Transmitting antennas; Vectors; Linear precoding; multi-user multiple-input–multiple-output (MIMO) channels; partial feedback;
fLanguage :
English
Journal_Title :
Vehicular Technology, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9545
Type :
jour
DOI :
10.1109/TVT.2012.2227857
Filename :
6354003
Link To Document :
بازگشت