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Paper Abstract and Keywords
Presentation 2014-10-16 10:10
Study of Channel Prediction for Multi-user MIMO Precoding System
Toshiki Tanaka, Hidekazu Murata (Kyoto Univ.) RCS2014-158
Abstract (in Japanese) (See Japanese page) 
(in English) Multi-user multiple-input multiple-output (MU-MIMO) technique is one of the most important contributions to improve the spectrum efficiency of wireless communication systems, as long as channel state information (CSI) is available at the transmitter, so that spatial properties of the channel can be exploited by precoding.
However, in time varying channels, the transmission performance of MU-MIMO systems is degraded because CSI is outdated due to feedback delay and inter-user interference occurs when CSI is varying.
Considering this scenario, channel prediction can provide up-to-date CSI and reduce inter-user interference.
However, many studies of channel prediction are considered under stationary channels, so that it is not clear whether channel prediction is applied for real environments or not.
In our experiments, there are residual carrier frequency offsets between BS and MSs.
These offsets need to be compensated for channel prediction.
This paper presents indoor experimental results on the receiver performance with channel prediction.
Experimental results show that the BER performance is improved with channel prediction methods such as RLS algorithm and linear extrapolation.
Keyword (in Japanese) (See Japanese page) 
(in English) Multi-user MIMO / Transmission experiment / RLS algorithm / / / / /  
Reference Info. IEICE Tech. Rep., vol. 114, no. 254, RCS2014-158, pp. 13-18, Oct. 2014.
Paper # RCS2014-158 
Date of Issue 2014-10-09 (RCS) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
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Conference Information
Committee RCS  
Conference Date 2014-10-16 - 2014-10-17 
Place (in Japanese) (See Japanese page) 
Place (in English) Keio Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Wireless Communication Schemes, Wireless Communication Systems, Wireless Standards, etc. 
Paper Information
Registration To RCS 
Conference Code 2014-10-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Study of Channel Prediction for Multi-user MIMO Precoding System 
Sub Title (in English)  
Keyword(1) Multi-user MIMO  
Keyword(2) Transmission experiment  
Keyword(3) RLS algorithm  
1st Author's Name Toshiki Tanaka  
1st Author's Affiliation Kyoto University (Kyoto Univ.)
2nd Author's Name Hidekazu Murata  
2nd Author's Affiliation Kyoto University (Kyoto Univ.)
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Date Time 2014-10-16 10:10:00 
Presentation Time 20 
Registration for RCS 
Paper # IEICE-RCS2014-158 
Volume (vol) IEICE-114 
Number (no) no.254 
Page pp.13-18 
#Pages IEICE-6 
Date of Issue IEICE-RCS-2014-10-09 

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