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Paper Abstract and Keywords
Presentation 2006-07-19 09:15
LDPC coded iterative modified QRD-M algorithm
Koichi Adachi, Masao Nakagawa (Keio Univ.) RCS2006-61
Abstract (in Japanese) (See Japanese page) 
(in English) Maximum likelihood detection with QR decomposition and M-algorithm (QRD-M) is one of the detection methods in multiple-input multiple-output (MIMO) multiplexing. We recently proposed an iterative modified QRD-M with Turbo codes with decision directed channel estimation and showed that the packet error rate (PER) performance close to the ideal channel estimation case can be obtained. In the iterative modified QRD-M, signal ranking is performed based on both received signal-to-interference plus noise power ratio (SINR) and the result of cyclic redundancy check (CRC) codes and then, signal detection is performed by modified M-algorithm based on the CRC check results. In this paper, we apply irregular low density parity check (irregular LDPC) codes to the previously proposed iterative modified QRD-M. The a posteriori probability of each bit (including parity bit) is necessary for decision directed channel estimation and modified M-algorithm in the iterative modified QRD-M. Unlike Turbo decoding, in LDPC decoding, the a posteriori probability of each bit can be obtained. Thus, by using LDPC codes, more accurate signal detection is possible than Turbo codes. To achieve more powerful detection of decoding errors, CRC check can be jointly used with parity check equation of LDPC codes. It is shown by the computer simulation that the performance of the LDPC coded iterative modified QRD-M is superior to that of the Turbo coded iterative modified QRD-M.
Keyword (in Japanese) (See Japanese page) 
(in English) OFDM-MIMO / QRD-M / Iterative signal detection / CRC codes / LDPC codes / / /  
Reference Info. IEICE Tech. Rep., vol. 106, no. 168, RCS2006-61, pp. 13-18, July 2006.
Paper # RCS2006-61 
Date of Issue 2006-07-12 (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 RCS2006-61

Conference Information
Committee RCS NS  
Conference Date 2006-07-19 - 2006-07-21 
Place (in Japanese) (See Japanese page) 
Place (in English) Hokkaido Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To RCS 
Conference Code 2006-07-RCS-NS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) LDPC coded iterative modified QRD-M algorithm 
Sub Title (in English)  
Keyword(1) OFDM-MIMO  
Keyword(2) QRD-M  
Keyword(3) Iterative signal detection  
Keyword(4) CRC codes  
Keyword(5) LDPC codes  
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1st Author's Name Koichi Adachi  
1st Author's Affiliation Keio University (Keio Univ.)
2nd Author's Name Masao Nakagawa  
2nd Author's Affiliation Keio University (Keio Univ.)
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Speaker Author-1 
Date Time 2006-07-19 09:15:00 
Presentation Time 20 minutes 
Registration for RCS 
Paper # RCS2006-61 
Volume (vol) vol.106 
Number (no) no.168 
Page pp.13-18 
#Pages 6 
Date of Issue 2006-07-12 (RCS) 

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