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| Presentation | 2015-03-06 15:25 Iterative Reception Employing Sparse Channel Estimation for OFDM Systems Yuta Takahashi, Kazuhiko Fukawa, Hiroshi Suzuki, Yuyuan Chang (Tokyo Tech)  RCS2014-372 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | OFDM transmission schemes are adopted for the integrated services digital broadcasting-terrestrial (ISDB-T) and the downlink of LTE. Their wireless channels are likely to be frequency selective fading in which absolute values of many propagation paths are negligible, that is sparse channels. In addition, when the receiver moves rapidly, the channel varies fast due to the Doppler effect and the accuracy of channel estimation deteriorates significantly. In order to alleviate its deterioration, the iterative channel estimation scheme with the tap selection and the LMS algorithm exploiting the log-likelihood ratio (LLR) of the coded bits from the decoder has been studied. For further improvement of the channel esimation accuracy, this report investigates a channel estimaion scheme employing the optimization method with $ell_1$ norm regularization, called a Fast Iterative Shrinkage-Thresholding Algorithm (FISTA), and proposes the iterative reception for OFDM systems employing such a channel estimation scheme. For both the initial channel estimation using scattered-pilots (SPs) of several symbols and the soft decision directed channel estimaion (SDCE) using replicas of transmitted signals, the proposed method to apply FISTA can estimate the sparse channel more precisely than the least squares method. For evaluating the performance of the proposed method, computer simulations following ISDB-T with SP-OFDM are conducted. It is shown that the proposed method can estimate the sparse channel impulse response much more accurately than the conventional method. | |
| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | mobile communication / scattered-pilot OFDM / decision-directed channel estimation / $ell_1$ regularization / sparse channel estimation / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 114, no. 490, RCS2014-372, pp. 423-428, March 2015. | |
| Paper # | RCS2014-372 | |
| Date of Issue | 2015-02-25 (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 | RCS2014-372 |
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| Conference Information | |
| Committee | RCS SR SRW |
| Conference Date | 2015-03-04 - 2015-03-06 |
| 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 | 2015-03-RCS-SR-SRW |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Iterative Reception Employing Sparse Channel Estimation for OFDM Systems |
| Sub Title (in English) | |
| Keyword(1) | mobile communication |
| Keyword(2) | scattered-pilot OFDM |
| Keyword(3) | decision-directed channel estimation |
| Keyword(4) | $ell_1$ regularization |
| Keyword(5) | sparse channel estimation |
| Keyword(6) | |
| Keyword(7) | |
| Keyword(8) | |
| 1st Author's Name | Yuta Takahashi |
| 1st Author's Affiliation | Tokyo Institute of Technology (Tokyo Tech) |
| 2nd Author's Name | Kazuhiko Fukawa |
| 2nd Author's Affiliation | Tokyo Institute of Technology (Tokyo Tech) |
| 3rd Author's Name | Hiroshi Suzuki |
| 3rd Author's Affiliation | Tokyo Institute of Technology (Tokyo Tech) |
| 4th Author's Name | Yuyuan Chang |
| 4th Author's Affiliation | Tokyo Institute of Technology (Tokyo Tech) |
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| Speaker | Author-1 |
| Date Time | 2015-03-06 15:25:00 |
| Presentation Time | 25 minutes |
| Registration for | RCS |
| Paper # | RCS2014-372 |
| Volume (vol) | vol.114 |
| Number (no) | no.490 |
| Page | pp.423-428 |
| #Pages | 6 |
| Date of Issue | 2015-02-25 (RCS) |
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