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Paper Abstract and Keywords
Presentation 2015-11-05 09:55
A Study on Low Complexity Inter-user Interference Aware MIMO Decoder for High Performance Downlink MU-MIMO Systems
Reina Hongyo, Leonardo Lanante Jr, Hiroshi Ochi (Kyutech) RCS2015-206
Abstract (in Japanese) (See Japanese page) 
(in English) Multi user multiple input multiple output (MU-MIMO) is a technology used in IEEE 802.11ac very high throughput wireless local area network (WLAN). MU-MIMO allows the access point (AP) to simultaneously transmit to multiple users at the same frequency band. This is possible because the MU-MIMO eliminates inter-user interference (IUI) with precoding techniques using channel state information (CSI) feedback from each user. However, IUI may still appear due to imperfect precoding caused by many factors such as CSI feedback delay and noise. Therefore, each receiver needs to decode the signal taking IUI into consideration to increase performance. IUI aware maximum likelihood detection (MLD) is the optimal approach for decoding MU-MIMO. However, the complexity of MLD increases exponentially with the modulation level and with the number of the transmitter antennas. In this paper, we propose a low complexity IUI aware MLD for high performance MU-MIMO systems. The proposed method applies a modified K-best method on the detection of the interference signals, efficiently reducing the candidates of transmitted signal. Our simulation results show that the proposed method can reduce more than 95% of complexity compared to IUI aware MLD while maintaining high bit error rate (BER) performance.
Keyword (in Japanese) (See Japanese page) 
(in English) IEEE 802.11ac / MU-MIMO / MIMO decoder / Inter-user interference / CSI feedback delay / / /  
Reference Info. IEICE Tech. Rep., vol. 115, no. 288, RCS2015-206, pp. 97-102, Nov. 2015.
Paper # RCS2015-206 
Date of Issue 2015-10-28 (RCS) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF RCS2015-206

Conference Information
Committee AP RCS WPT SAT  
Conference Date 2015-11-04 - 2015-11-06 
Place (in Japanese) (See Japanese page) 
Place (in English) Okinawa Prefectural Museum & Art Museum 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Antenna and Propagation, Radio Communication, Satelite Communication, Wireless Power Transfer 
Paper Information
Registration To RCS 
Conference Code 2015-11-AP-RCS-WPT-SAT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Study on Low Complexity Inter-user Interference Aware MIMO Decoder for High Performance Downlink MU-MIMO Systems 
Sub Title (in English)  
Keyword(1) IEEE 802.11ac  
Keyword(2) MU-MIMO  
Keyword(3) MIMO decoder  
Keyword(4) Inter-user interference  
Keyword(5) CSI feedback delay  
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Keyword(7)  
Keyword(8)  
1st Author's Name Reina Hongyo  
1st Author's Affiliation Kyushu Institute of Technology (Kyutech)
2nd Author's Name Leonardo Lanante Jr  
2nd Author's Affiliation Kyushu Institute of Technology (Kyutech)
3rd Author's Name Hiroshi Ochi  
3rd Author's Affiliation Kyushu Institute of Technology (Kyutech)
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Speaker Author-1 
Date Time 2015-11-05 09:55:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # RCS2015-206 
Volume (vol) vol.115 
Number (no) no.288 
Page pp.97-102 
#Pages 6 
Date of Issue 2015-10-28 (RCS) 

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