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Paper Abstract and Keywords
Presentation 2014-03-05 13:00
Design Algorithm of Relative Magnitude Coefficients using Brent's Method on the K-User MIMO-IFC
Kunitaka Matsumura, Tomoaki Ohtsuki (Keio Univ.) RCS2013-381
Abstract (in Japanese) (See Japanese page) 
(in English) Interference alignment (IA) is known as having a great effect on the capacity achieved at each receiver in interference channel, when used in conjunction with multiple-input multiple-output (MIMO) technology. Using
coordinating base station (BS) transmission, the system generates the beamforming vector to align interference signals into con ned subspace at each receiver, where the beamforming and subspace vectors are calculated using the relative magnitude coefficients. It is difficult to design these coefficients, since it is needed to solve non-linear equations. In [6], we propose the design algorithm of the relative magnitude coefficients. Using Brent's method iteratively, our design algorithm improves system capacity largely. However, this method requires the system that one BS is assumed to have one more transmit antenna than the other BSs. In this report, we extend the algo-rithm in [6] to be applicable for more general system where all the base stations have the same number of transmit antennas. As the extended algorithm, we propose how to select an un-eliminated interference signal and calculate the beamforming vectors and the interference signal spaces. We compare the capacities of the proposed method in [6] and the extended one, and evaluate how much system capacity the proposed design method of the relative magnitude coefficients can achieve in the situation where all the base stations have the same number of transmit antennas. In addition, we show that the proposed design algorithm improves the fairness of capacities among users.
Keyword (in Japanese) (See Japanese page) 
(in English) Interference Alignment (IA) / Multi-user MIMO / Beamforming / Brent's method / / / /  
Reference Info. IEICE Tech. Rep., vol. 113, no. 456, RCS2013-381, pp. 451-456, March 2014.
Paper # RCS2013-381 
Date of Issue 2014-02-24 (RCS) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
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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)
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Conference Information
Committee RCS SR SRW  
Conference Date 2014-03-03 - 2014-03-05 
Place (in Japanese) (See Japanese page) 
Place (in English) Waseda Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Mobile Communication Workshop 
Paper Information
Registration To RCS 
Conference Code 2014-03-RCS-SR-SRW 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Design Algorithm of Relative Magnitude Coefficients using Brent's Method on the K-User MIMO-IFC 
Sub Title (in English)  
Keyword(1) Interference Alignment (IA)  
Keyword(2) Multi-user MIMO  
Keyword(3) Beamforming  
Keyword(4) Brent's method  
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1st Author's Name Kunitaka Matsumura  
1st Author's Affiliation Keio University (Keio Univ.)
2nd Author's Name Tomoaki Ohtsuki  
2nd Author's Affiliation Keio University (Keio Univ.)
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Speaker Author-1 
Date Time 2014-03-05 13:00:00 
Presentation Time 20 minutes 
Registration for RCS 
Paper # RCS2013-381 
Volume (vol) vol.113 
Number (no) no.456 
Page pp.451-456 
#Pages
Date of Issue 2014-02-24 (RCS) 


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