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| Presentation | 2013-11-22 14:55 A Study on Adaptive LLR Quantization for Decode-Quantize-Forward Relaying Yuichiro Nogawa, Shinsuke Ibi, Seiichi Sampei (Osaka Univ.)  RCS2013-202 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | This paper proposes a novel two hop relaying strategy which adaptively quantizes extrinsic log likelihood ratio (LLR) according to Signal to Noise Ratio (SNR) of the first hop. In decode-demodulate-and-forward (DDF) relaying, the bit stream containing some errors is forwarded to the destination when it is subject to low SNR in the first hop transmission. Due to the bit flipped stream from original message, an error floor one bit error rate (BER) performance appears at the destination node, even in the situation where the errorless transmission over the second hop links. We focus on the fact that it is capable of mitigating the error floor with the assistance of extrinsic LLR of channel decoder outputs at the relay node. However, huge amount of wireless resources are occupied to forward the LLR to the destination node. To address this issue quantized LLR is conveyed. A primary contribution of this paper is a methodology to adaptively quantize the LLR according to statistical properties of the LLR obtained over the first broadcast transmission, which is referred to as decode-adaptive quantize-and-forward (DAQF) relaying. We confirm that the validity of DAQF compared to two hop DDF method by computer simulations. |
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| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | cooperative relaying / decode-demodulate-and-forward / quantize-and-forward / error propagation / / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 113, no. 301, RCS2013-202, pp. 165-170, Nov. 2013. | |
| Paper # | RCS2013-202 | |
| Date of Issue | 2013-11-13 (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 | RCS2013-202 |
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| Conference Information | |
| Committee | RCS AP |
| Conference Date | 2013-11-20 - 2013-11-22 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Matsue Terrsa |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Adaptive Antenna, Equalization, Interference Canceller, MIMO, Wireless Communication Systems, etc. |
| Paper Information | |
| Registration To | RCS |
| Conference Code | 2013-11-RCS-AP |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | A Study on Adaptive LLR Quantization for Decode-Quantize-Forward Relaying |
| Sub Title (in English) | |
| Keyword(1) | cooperative relaying |
| Keyword(2) | decode-demodulate-and-forward |
| Keyword(3) | quantize-and-forward |
| Keyword(4) | error propagation |
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| Keyword(6) | |
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| Keyword(8) | |
| 1st Author's Name | Yuichiro Nogawa |
| 1st Author's Affiliation | Osaka University (Osaka Univ.) |
| 2nd Author's Name | Shinsuke Ibi |
| 2nd Author's Affiliation | Osaka University (Osaka Univ.) |
| 3rd Author's Name | Seiichi Sampei |
| 3rd Author's Affiliation | Osaka University (Osaka Univ.) |
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| Speaker | Author-1 |
| Date Time | 2013-11-22 14:55:00 |
| Presentation Time | 25 minutes |
| Registration for | RCS |
| Paper # | RCS2013-202 |
| Volume (vol) | vol.113 |
| Number (no) | no.301 |
| Page | pp.165-170 |
| #Pages | 6 |
| Date of Issue | 2013-11-13 (RCS) |
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