Presentation 2021-11-25
Soft Input Decoding Based on Superposition of Hard Decision Signals
Koki Kashihara, Satoshi Denno, Hou Yafei,
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Abstract(in Japanese) (See Japanese page)
Abstract(in English) In MIMO (Multiple-Input Multiple-Output) communication, it is possible to detect hard judgment signals with low calculations by using a linear filter with lattice reduction. In general, the error correction code is used in wireless communication, and it is known that the soft judgment decoding method using the soft judgment value input can obtain a higher error correction effect. However, there is a problem that the calculation amount of the soft judgment value increases. In this paper, we propose a soft input decoding based on superposition of hard decision signals. In the proposed method, we make several near point hardness judgment signals of signals detected by linear filters. Then, by calculating the probability of the signal and weighting, the soft judgment value is created with a low calculation amount. In addition, we select the near point hardness judgment signal and calculate the probability so that the error correction effect becomes larger. In this time, in the MIMO system with four transmitting antennas and four receiving antennas in QPSK, the evaluation of BER (Bit Error Rate) characteristics by applying the proposed method was carried out by computer simulation. As a result, it was confirmed that the improvement of the transmission characteristics was obtained by obtaining the gain of the error correction effect when the SIC filter and the MMSE filter were used.
Keyword(in Japanese) (See Japanese page)
Keyword(in English) MIMO / lattice reduction / linear filter / soft output
Paper # SRW2021-30
Date of Issue 2021-11-18 (SRW)

Conference Information
Committee SRW / SeMI / CNR
Conference Date 2021/11/25(2days)
Place (in Japanese) (See Japanese page)
Place (in English) Kikai-Shinko-Kaikan Bldg.
Topics (in Japanese) (See Japanese page)
Topics (in English) IoT Workshop
Chair Hanako Noda(Anritsu) / Koji Yamamoto(Kyoto Univ.) / Masayuki Kanbara(NAIST)
Vice Chair Keiichi Mizutani(Kyoto Univ.) / Kentaro Saito(Tokyo Denki Univ.) / Hirokazu Sawada(NICT) / Kazuya Monden(Hitachi) / Yasunori Owada(NICT) / Yoshihiko Murakawa(Kyoto Inst. of Tech.)
Secretary Keiichi Mizutani(NTT) / Kentaro Saito(NIigata Univ.) / Hirokazu Sawada(Cyber Univ.) / Kazuya Monden(Waseda Univ.) / Yasunori Owada(Osaka Univ.) / Yoshihiko Murakawa(Toshiba)
Assistant Akihito Noda(Nanzan Univ.) / Yuki Katsumata(NTT DOCOMO) / Akihito Taya(Aoyama Gakuin Univ.) / Yu Nakayama(Tokyo Univ. of Agri. and Tech.) / Yuta Hoshi(NHK) / Junji Yamato(Kogakuin Univ.)

Paper Information
Registration To Technical Committee on Short Range Wireless Communications / Technical Committee on Sensor Network and Mobile Intelligence / Technical Committee on Cloud Network Robotics
Language JPN
Title (in Japanese) (See Japanese page)
Sub Title (in Japanese) (See Japanese page)
Title (in English) Soft Input Decoding Based on Superposition of Hard Decision Signals
Sub Title (in English)
Keyword(1) MIMO
Keyword(2) lattice reduction
Keyword(3) linear filter
Keyword(4) soft output
1st Author's Name Koki Kashihara
1st Author's Affiliation Okayama University(Okayama Univ.)
2nd Author's Name Satoshi Denno
2nd Author's Affiliation Okayama University(Okayama Univ.)
3rd Author's Name Hou Yafei
3rd Author's Affiliation Okayama University(Okayama Univ.)
Date 2021-11-25
Paper # SRW2021-30
Volume (vol) vol.121
Number (no) SRW-265
Page pp.pp.7-12(SRW),
#Pages 6
Date of Issue 2021-11-18 (SRW)