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| Presentation | 2008-03-07 09:50 OFDM-MAP Signal Detection Employing Recursive Channel Estimation with Symbol Interleaver in Fast Fading Environments Tatsuya Uchida, Satoshi Suyama, Kazuhiko Fukawa, Hiroshi Suzuki (Tokyo Inst. of Tech.)  CAS2007-126 SIP2007-201 CS2007-91 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | This report proposes an OFDM-MAP receiver employing the EM algorithm that introduces the differential model as a channel model for channel estimation and that recursively estimates a channel impulse response with OFDM symbol by symbol decoding. The EM algorithm can reduce complexity of the MAP detection to a feasible amount in OFDM mobile communications. An application of the EM algorithm which the proposed scheme adopts regards transmitted signals as hidden variables, and recursively performs MAP-based channel estimation. To cope with severe time-variation over a fast fading channel, the proposed scheme introduces the differential model having differentials of the channel impulse response with respect to time. The transmitter interleaves coded bits symbol by symbol so that the receiver can reduce the number of turbo iterations. Thus, the receiver can recursively decode coded bits per OFDM symbol and the resultant log likelihood ratios (LLRs) of coded bits can be used without delay for the recursive channel estimation. Computer simulations under the fast fading condition demonstrate that the proposed can reduce the number of turbo iterations and is superior in packet error rate to conventional ones using packet interleaver. | |
| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | Mobile communication / OFDM / EM algorithm / channel estimation / recursive decoding / MAP detection / / | |
| Reference Info. | IEICE Tech. Rep., vol. 107, no. 531, CS2007-91, pp. 5-10, March 2008. | |
| Paper # | CS2007-91 | |
| Date of Issue | 2008-02-29 (CAS, SIP, CS) | |
| 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 | CAS2007-126 SIP2007-201 CS2007-91 |
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| Conference Information | |
| Committee | CS SIP CAS |
| Conference Date | 2008-03-06 - 2008-03-07 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Yamaguchi University |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Network processors, signal processing for communications, wireless LAN/PAN, etc. |
| Paper Information | |
| Registration To | CS |
| Conference Code | 2008-03-CS-SIP-CAS |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | OFDM-MAP Signal Detection Employing Recursive Channel Estimation with Symbol Interleaver in Fast Fading Environments |
| Sub Title (in English) | |
| Keyword(1) | Mobile communication |
| Keyword(2) | OFDM |
| Keyword(3) | EM algorithm |
| Keyword(4) | channel estimation |
| Keyword(5) | recursive decoding |
| Keyword(6) | MAP detection |
| Keyword(7) | |
| Keyword(8) | |
| 1st Author's Name | Tatsuya Uchida |
| 1st Author's Affiliation | Tokyo Institute of Technology (Tokyo Inst. of Tech.) |
| 2nd Author's Name | Satoshi Suyama |
| 2nd Author's Affiliation | Tokyo Institute of Technology (Tokyo Inst. of Tech.) |
| 3rd Author's Name | Kazuhiko Fukawa |
| 3rd Author's Affiliation | Tokyo Institute of Technology (Tokyo Inst. of Tech.) |
| 4th Author's Name | Hiroshi Suzuki |
| 4th Author's Affiliation | Tokyo Institute of Technology (Tokyo Inst. of Tech.) |
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| Speaker | Author-1 |
| Date Time | 2008-03-07 09:50:00 |
| Presentation Time | 25 minutes |
| Registration for | CS |
| Paper # | CAS2007-126, SIP2007-201, CS2007-91 |
| Volume (vol) | vol.107 |
| Number (no) | no.527(CAS), no.529(SIP), no.531(CS) |
| Page | pp.5-10 |
| #Pages | 6 |
| Date of Issue | 2008-02-29 (CAS, SIP, CS) |
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