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Paper Abstract and Keywords
Presentation 2016-03-04 16:45
Suppression of Multiple Wideband-Interferences Based on Superposition Probability
Yuto Kakizaki, Yohei Shibata, Tomoaki Ohtsuki (Keio Univ.), Jun Mashino (NTT) RCS2015-399
Abstract (in Japanese) (See Japanese page) 
(in English) Superposed multicarrier transmission is proposed as one of the schemes that improve frequency utilization efficiency. In this scheme some wireless systems share the same spectrum, and interference suppression is necessary. One conventional scheme for the interference suppression applies the EM (Expectation Maximization) algorithm for the estimation of interference parameters, and another scheme iterates the estimation of the parameters based on undesired signal power. However, these schemes assume the same average power for all interferences, which makes accuracy of the estimated power lower and results in degradation of BER (Bit Error Rate) when the average power of each interference is not same. In this report, we propose a suppression schemes for multiple interferences with different average power levels. In our scheme, undesired signal power is averaged in both time and frequency domains, after which it is compared to threshold to determine if the corresponding subcarrier is superposed or not. According to the result of this comparison, the power of each interference is estimated. Furthermore, the threshold is iteratively recalculated when the estimated parameters are updated. Through computer simulations, we show that the proposed scheme taking the different average power of interference into account shows better BER performance than that of conventional ones assuming the same average power of interference. In addition, we show that averaging undesired signal power in both time and frequency domains and iterative calculation of threshold lead to improvement of the accuracy of superposed band detection.
Keyword (in Japanese) (See Japanese page) 
(in English) Superposed Multicarrier Transmission / LLR / Superposition Probability / Residual power / / / /  
Reference Info. IEICE Tech. Rep., vol. 115, no. 472, RCS2015-399, pp. 387-392, March 2016.
Paper # RCS2015-399 
Date of Issue 2016-02-24 (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. (No. 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF RCS2015-399

Conference Information
Committee RCS CCS SR SRW  
Conference Date 2016-03-02 - 2016-03-04 
Place (in Japanese) (See Japanese page) 
Place (in English) Tokyo Institute of Technology 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Mobile Communication Workshop 
Paper Information
Registration To RCS 
Conference Code 2016-03-RCS-CCS-SR-SRW 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Suppression of Multiple Wideband-Interferences Based on Superposition Probability 
Sub Title (in English)  
Keyword(1) Superposed Multicarrier Transmission  
Keyword(2) LLR  
Keyword(3) Superposition Probability  
Keyword(4) Residual power  
1st Author's Name Yuto Kakizaki  
1st Author's Affiliation Keio University (Keio Univ.)
2nd Author's Name Yohei Shibata  
2nd Author's Affiliation Keio University (Keio Univ.)
3rd Author's Name Tomoaki Ohtsuki  
3rd Author's Affiliation Keio University (Keio Univ.)
4th Author's Name Jun Mashino  
4th Author's Affiliation Nippon Telegraph and Telephone Corporation (NTT)
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Date Time 2016-03-04 16:45:00 
Presentation Time 25 
Registration for RCS 
Paper # IEICE-RCS2015-399 
Volume (vol) IEICE-115 
Number (no) no.472 
Page pp.387-392 
#Pages IEICE-6 
Date of Issue IEICE-RCS-2016-02-24 

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