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| Presentation | 2021-01-21 11:20 A Study on Log Likelihood Ratio for Iterative Detection and Decoding of LoRa Modulation Takuya Mihara, Shinsuke Ibi (Doshisha Univ.), Takumi Takahashi (Osaka Univ.), Hisato Iwai (Doshisha Univ.)  IT2020-68 SIP2020-46 RCS2020-159 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | In Internet of things (IoT) devices, low power wide area (LPWA) has been attracting attention, and LoRa modulation is an important modulation technology in LPWA. The demodulation and decoding process is simplified in LoRa receivers with the aid of hard decision values yielded from demodulator to decoder. However, in this case, quantization (rounding) error may occur mutual information loss. In this paper, we propose a method for log-likelihood ratio (LLR) and error correction based on the soft decision of the demodulator output, as well as iterative detection and decoding (IDD) scheme. Assuming Rayleigh fading environments, the log-likelihood ratios for coherent and non-coherent detection are defined and blind channel estimation for LoRA is proposed. The transmission characteristics are clarified in terms of bit error rate (BER) by computer simulations. |
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| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | LoRa / Hamming code / log-likelihood ratio / soft decision / maximum likelihood estimation / iterative detection and decoding / / | |
| Reference Info. | IEICE Tech. Rep., vol. 120, no. 322, RCS2020-159, pp. 28-33, Jan. 2021. | |
| Paper # | RCS2020-159 | |
| Date of Issue | 2021-01-14 (IT, SIP, RCS) | |
| ISSN | 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 | IT2020-68 SIP2020-46 RCS2020-159 |
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| Conference Information | |
| Committee | SIP IT RCS |
| Conference Date | 2021-01-21 - 2021-01-22 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Online |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Paper Information | |
| Registration To | RCS |
| Conference Code | 2021-01-SIP-IT-RCS |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | A Study on Log Likelihood Ratio for Iterative Detection and Decoding of LoRa Modulation |
| Sub Title (in English) | |
| Keyword(1) | LoRa |
| Keyword(2) | Hamming code |
| Keyword(3) | log-likelihood ratio |
| Keyword(4) | soft decision |
| Keyword(5) | maximum likelihood estimation |
| Keyword(6) | iterative detection and decoding |
| Keyword(7) | |
| Keyword(8) | |
| 1st Author's Name | Takuya Mihara |
| 1st Author's Affiliation | Doshisha University (Doshisha Univ.) |
| 2nd Author's Name | Shinsuke Ibi |
| 2nd Author's Affiliation | Doshisha University (Doshisha Univ.) |
| 3rd Author's Name | Takumi Takahashi |
| 3rd Author's Affiliation | Osaka University (Osaka Univ.) |
| 4th Author's Name | Hisato Iwai |
| 4th Author's Affiliation | Doshisha University (Doshisha Univ.) |
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| Speaker | Author-1 |
| Date Time | 2021-01-21 11:20:00 |
| Presentation Time | 25 minutes |
| Registration for | RCS |
| Paper # | IT2020-68, SIP2020-46, RCS2020-159 |
| Volume (vol) | vol.120 |
| Number (no) | no.320(IT), no.321(SIP), no.322(RCS) |
| Page | pp.28-33 |
| #Pages | 6 |
| Date of Issue | 2021-01-14 (IT, SIP, RCS) |
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