| Presentation | 2021-01-21 A Study on Log Likelihood Ratio for Iterative Detection and Decoding of LoRa Modulation Takuya Mihara, Shinsuke Ibi, Takumi Takahashi, Hisato Iwai, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(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. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | LoRa / Hamming code / log-likelihood ratio / soft decision / maximum likelihood estimation / iterative detection and decoding |
| Paper # | IT2020-68,SIP2020-46,RCS2020-159 |
| Date of Issue | 2021-01-14 (IT, SIP, RCS) |
| Conference Information | |
| Committee | SIP / IT / RCS |
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| Conference Date | 2021/1/21(2days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Online |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Chair | Kazunori Hayashi(Kyoto Univ.) / Tadashi Wadayama(Nagoya Inst. of Tech.) / Eiji Okamoto(Nagoya Inst. of Tech.) |
| Vice Chair | Yukihiro Bandou(NTT) / Toshihisa Tanaka(Tokyo Univ. Agri.&Tech.) / Tetsuya Kojima(Tokyo Kosen) / Fumiaki Maehara(Waseda Univ.) / Toshihiko Nishimura(Hokkaido Univ.) / Tomoya Tandai(Toshiba) |
| Secretary | Yukihiro Bandou(Hosei Univ.) / Toshihisa Tanaka(Waseda Univ.) / Tetsuya Kojima(Yamaguchi Univ.) / Fumiaki Maehara(Saga Univ.) / Toshihiko Nishimura(Kyushu Univ.) / Tomoya Tandai(NEC) |
| Assistant | Yuichi Tanaka(Tokyo Univ. Agri.&Tech.) / Takahiro Ohta(Senshu Univ.) / Koichi Adachi(Univ. of Electro-Comm.) / Osamu Nakamura(Sharp) / Manabu Sakai(Mitsubishi Electric) / Masashi Iwabuchi(NTT) / Tatsuki Okuyama(NTT DOCOMO) |
| Paper Information | |
| Registration To | Technical Committee on Signal Processing / Technical Committee on Information Theory / Technical Committee on Radio Communication Systems |
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| Language | JPN |
| 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 |
| 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.) |
| Date | 2021-01-21 |
| Paper # | IT2020-68,SIP2020-46,RCS2020-159 |
| Volume (vol) | vol.120 |
| Number (no) | IT-320,SIP-321,RCS-322 |
| Page | pp.pp.28-33(IT), pp.28-33(SIP), pp.28-33(RCS), |
| #Pages | 6 |
| Date of Issue | 2021-01-14 (IT, SIP, RCS) |