| Presentation | 2021-08-26 Encoding and Decoding of Polar Codes for Frequency Selective Fading Channels Song Huiying, Fukawa Kazuhiko, Chang Yuyuan, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Recently, the polar code has attracted much attention because it has been adopted as a channel coding for control channels of fifth-generation mobile communications (5G) and beyond. Various schemes have been proposed to improve the performance of polar codes over the AWGN channel, whereas few studies have tackled improvements of polar codes over fading channels. Hence, this report focuses on polar codes for OFDM transmission over frequency selective fading channels. As a Conventional encoding scheme, a bit-flip belief propagation (BP) decoder employing critical set (CS) can improve the block error rate (BLER) of the polar code over the AWGN channel. However, this conventional scheme is expected to incur degradation of BLER over the frequency selective fading channel, because it does not consider the channel state information (CSI). Therefore, this report investigates both encoding and decoding of the polar code based on the CSI for the OFDM frequency selective fading channels. Firstly, the frozen bits and CS of the polar code are assigned on the basis of the log likelihood ratio (LLR) of each encoded bit, which is obtained from the CSI and is used for the BP decoder to estimate the LLR of the information bit. Then in ascending order of the absolute values of these LLRs, the information bits are assigned into the frozen bits and CS. Finally, information on the frozen bits is fed back to the transmitter and used for the encoding of the polar code. The receiver processes the OFDM signal in order to decode the polar code by using information on the frozen bits and CS. Computer simulations demonstrate that the proposed frozen bits and CS designs gain average $E_b/N_0$ of at most 1 dB and 0.7 dB, respectively, over the conventional design schemes. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | OFDM / polar code / frozen bit / critical set / frequency selective fading |
| Paper # | RCS2021-99 |
| Date of Issue | 2021-08-19 (RCS) |
| Conference Information | |
| Committee | RCS / SAT |
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| Conference Date | 2021/8/26(2days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Online |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Chair | Eiji Okamoto(Nagoya Inst. of Tech.) / Hiroyasu Ishikawa(Nihon Univ.) |
| Vice Chair | Toshihiko Nishimura(Hokkaido Univ.) / Tomoya Tandai(Toshiba) / Fumihide Kojima(NICT) / Tetsushi Ikegami(Meiji Univ.) / Takana Kaho(Shonan Inst. of Tech.) |
| Secretary | Toshihiko Nishimura(NEC) / Tomoya Tandai(Panasonic) / Fumihide Kojima(KDDI Research) / Tetsushi Ikegami(NICT) / Takana Kaho |
| Assistant | Koichi Adachi(Univ. of Electro-Comm.) / Osamu Nakamura(Sharp) / Manabu Sakai(Mitsubishi Electric) / Masashi Iwabuchi(NTT) / Tatsuki Okuyama(NTT DOCOMO) / Daisuke Goto(NTT) / Yuuki Koizumi(NHK) |
| Paper Information | |
| Registration To | Technical Committee on Radio Communication Systems / Technical Committee on Satellite Telecommunications |
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| Language | ENG-JTITLE |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Encoding and Decoding of Polar Codes for Frequency Selective Fading Channels |
| Sub Title (in English) | |
| Keyword(1) | OFDM |
| Keyword(2) | polar code |
| Keyword(3) | frozen bit |
| Keyword(4) | critical set |
| Keyword(5) | frequency selective fading |
| 1st Author's Name | Song Huiying |
| 1st Author's Affiliation | Tokyo Institute of Technology(Tokyo Tech) |
| 2nd Author's Name | Fukawa Kazuhiko |
| 2nd Author's Affiliation | Tokyo Institute of Technology(Tokyo Tech) |
| 3rd Author's Name | Chang Yuyuan |
| 3rd Author's Affiliation | Tokyo Institute of Technology(Tokyo Tech) |
| Date | 2021-08-26 |
| Paper # | RCS2021-99 |
| Volume (vol) | vol.121 |
| Number (no) | RCS-153 |
| Page | pp.pp.1-6(RCS), |
| #Pages | 6 |
| Date of Issue | 2021-08-19 (RCS) |