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Paper Abstract and Keywords
Presentation 2011-08-26 13:50
A Study of Adaptive Bit Loading for Single-carrier Transmission Using Reduced Complexity Maximum-Likelihood Block Detection
Tetsuya Yamamoto, Fumiyuki Adachi (Tohoku Univ.) RCS2011-130
Abstract (in Japanese) (See Japanese page) 
(in English) In this paper, we propose an adaptive single-carrier (SC) transmission suitable for near maximum likelihood (ML) block detection using QR decomposition and M-algorithm (QRM-MLBD). QRM-MLBD can significantly improve the bit error rate (BER) performance of SC block transmission compared to the frequency-domain equalization (FDE) based on the minimum mean square error (MMSE) criterion. However, in order to achieve a sufficiently improved performance, the use of a fairly large number M of surviving paths in the M-algorithm is required and hence its computational complexity is still very high. If smaller M is used, the BER performance degrades because the probability of removing the correct path at early stages increases. In this paper, to remedy the above problem, we propose an unequal bit loading in an SC transmission block. In QRM-MLBD, the received signal power available at early stages in the M-algorithm (i.e. symbols near the end of block) becomes low. By noting this fact, less number of bits (i.e., lower modulation level) is loaded on symbols close to the end of block. We show that the unequal bit loading for SC block transmission using QRM-MLBD can improve the BER performance compared to the conventional QRM-MLBD for smaller number M of surviving paths in the M-algorithm.
Keyword (in Japanese) (See Japanese page) 
(in English) Single-carrier / bit loading / QR decomposition / M-algorithm / maximum likelihood detection / / /  
Reference Info. IEICE Tech. Rep., vol. 111, no. 180, RCS2011-130, pp. 105-110, Aug. 2011.
Paper # RCS2011-130 
Date of Issue 2011-08-18 (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 RCS2011-130

Conference Information
Committee RCS SAT  
Conference Date 2011-08-25 - 2011-08-26 
Place (in Japanese) (See Japanese page) 
Place (in English) Niigata Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Special session on coding techniques, Mobile Satellite Communications, Broadcasting, Error Correction, Wireless Communication Systems, etc. 
Paper Information
Registration To RCS 
Conference Code 2011-08-RCS-SAT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Study of Adaptive Bit Loading for Single-carrier Transmission Using Reduced Complexity Maximum-Likelihood Block Detection 
Sub Title (in English)  
Keyword(1) Single-carrier  
Keyword(2) bit loading  
Keyword(3) QR decomposition  
Keyword(4) M-algorithm  
Keyword(5) maximum likelihood detection  
1st Author's Name Tetsuya Yamamoto  
1st Author's Affiliation Tohoku University (Tohoku Univ.)
2nd Author's Name Fumiyuki Adachi  
2nd Author's Affiliation Tohoku University (Tohoku Univ.)
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Date Time 2011-08-26 13:50:00 
Presentation Time 25 
Registration for RCS 
Paper # IEICE-RCS2011-130 
Volume (vol) IEICE-111 
Number (no) no.180 
Page pp.105-110 
#Pages IEICE-6 
Date of Issue IEICE-RCS-2011-08-18 

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