Paper Info
Title
New Robust Beamforming Method For Frequency Offsets In Uplink Multiuser Ofdm-Mimo
Abstract
Multiuser multiple input multiple output (MU-MIMO) systems are attracting attention due to their frequency efficiency. However, in uplink MU-MIMO systems, different frequency offsets among multiple mobile stations (MSs) significantly degrade the transmission quality, especially when orthogonal frequency division multiplexing (OFDM) is used. In this paper, the influence of these frequency offsets is first analyzed in a frequency selective fading environment. Numerical analysis shows that an error floor occurs in the bit error rate and the influence of the frequency offset becomes larger in short delay spread environments. To overcome this problem. a new beamforming method is proposed to compensate for the frequency offset by introducing an auto frequency controller after frequency-space equalization in each data stream. The effect of the proposed method is evaluated in a frequency selective fading environment by computer simulations and measured results.
Year
DOI
Venue
2007
10.1093/ietcom/e90-b.9.2312
IEICE TRANSACTIONS ON COMMUNICATIONS
Keywords
Field
DocType
multiuser MIMO, uplink, beamforming, frequency offset
Beamforming,Equalization (audio),Fading,Computer science,Frequency offset,MIMO,Electronic engineering,Automatic frequency control,Orthogonal frequency-division multiplexing,Bit error rate
Journal
Volume
Issue
ISSN
E90B
9
0916-8516
Citations 
PageRank 
References 
5
0.77
2
Authors
6
Name
Order
Citations
PageRank
Yasushi Takatori19224.89
Riichi Kudo28115.69
atsushi ohta36615.31
Koichi Ishihara43910.89
Kentaro Nishimori516531.27
S. Kubota69827.01