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Paper Abstract and Keywords
Presentation 2015-08-18 15:05
Complexity Reduction of Pico Cell Clustering for Interference Alignment in Heterogeneous Networks
Ryuma Seno, Tomoaki Ohtsuki (Keio Univ.), Wenjie Jiang, Yasushi Takatori, Kazuhiro Uehara (NTT) RCS2015-153
Abstract (in Japanese) (See Japanese page) 
(in English) Interference alignment (IA) in heterogeneous networks (HetNets) is a promising technique that improves the
spectral efficiency significantly. We showed in [1] that transmit antennas at pico base stations (BSs) could be utilized more
efficiently by clustering pico cells in IA in HetNet where the clustering formation was optimized so as to minimize the rate loss
caused by inter-cluster interference. In [1], the optimum clustering formation is selected by comparing all possible formations,
that is, the value of the objective function for all possible formations is calculated. Therefore, the enormous complexity to
construct pico cell clusters is required. In this report, we propose a novel algorithm for clustering pico cells that reduces the
complexity of the clustering process. In particular, we define rate-loss matrix that represents the rate loss caused by inter-pico
interference, and translate the optimization problem to the construction of rate-loss matrix. Although the proposed algorithm
is sub-optimum in terms of achievable rate compared to all-search algorithm used in [1], the simulation results show that the
difference of achievable rate between the proposed algorithm and all-search algorithm is negligible and becomes smaller as
the cluster size decreases. We evaluate the complexity of proposed algorithm quantitatively comparing to all-search algorithm, and show that our algorithm reduces the complexity of clustering process significantly while achieving almost same performance.
Keyword (in Japanese) (See Japanese page) 
(in English) / / / / / / /  
Reference Info. IEICE Tech. Rep., vol. 115, no. 181, RCS2015-153, pp. 123-128, Aug. 2015.
Paper # RCS2015-153 
Date of Issue 2015-08-10 (RCS) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
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 RCS2015-153

Conference Information
Committee RCS SAT  
Conference Date 2015-08-17 - 2015-08-18 
Place (in Japanese) (See Japanese page) 
Place (in English) Fukuoka Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Mobile Satellite Communications, Broadcasting, Error Correction, Wireless Communication Systems, etc. 
Paper Information
Registration To RCS 
Conference Code 2015-08-RCS-SAT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Complexity Reduction of Pico Cell Clustering for Interference Alignment in Heterogeneous Networks 
Sub Title (in English)  
1st Author's Name Ryuma Seno  
1st Author's Affiliation Keio University (Keio Univ.)
2nd Author's Name Tomoaki Ohtsuki  
2nd Author's Affiliation Keio University (Keio Univ.)
3rd Author's Name Wenjie Jiang  
3rd Author's Affiliation Nippon Telegraph and Telephone Corporation (NTT)
4th Author's Name Yasushi Takatori  
4th Author's Affiliation Nippon Telegraph and Telephone Corporation (NTT)
5th Author's Name Kazuhiro Uehara  
5th Author's Affiliation Nippon Telegraph and Telephone Corporation (NTT)
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Date Time 2015-08-18 15:05:00 
Presentation Time 25 
Registration for RCS 
Paper # IEICE-RCS2015-153 
Volume (vol) IEICE-115 
Number (no) no.181 
Page pp.123-128 
#Pages IEICE-6 
Date of Issue IEICE-RCS-2015-08-10 

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