2018 Fiscal Year Research-status Report
| Project/Area Number |
18K04132
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| Research Institution | Gifu University |
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Principal Investigator |
LU SHAN 岐阜大学, 工学部, 助教 (30755385)
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| Co-Investigator(Kenkyū-buntansha) |
程 俊 同志社大学, 理工学部, 教授 (00388042)
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| Project Period (FY) |
2018-04-01 – 2021-03-31
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| Keywords | random access, / multiuser coding, / spatial coupling, / 大規模センサネットワーク, / 圧縮センシング, / ランダムアクセス |
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| Outline of Annual Research Achievements |
We are progressing according to the plan in 2018 and achieved the following results.
(1). We are focusing on random access system that a large number of busty users in a wireless network operate in an uncoordinated fashion. We have proposed a multiuser coding scheme and successive interference cancellation method for random access Gaussian channel. An identical encoder for each user in random access system is proposed in the system. Numerical results show that 2-user coding scheme combined with SIC in random access Gaussian channel have the best performance, even better than the one-user coding scheme with SIC in the uncoded random access noiseless channel.
(2). We proposed a new kind of spatial coupling technique to improve the error-correcting performance of finite length polar codes. Multiple polar codes are associated by combining message bit blocks of adjacent coupling positions with modular-two addition. Simulation results show that, with a little extra iteration complexity, proposed spatially coupled polar codes can provide better error-correcting performance than original polar codes.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
As summarized in the Research Achievements section, the research is smoothly progressing according to the original plan in 2018.
(1). The stretch for designing common codes for massive access channel is established.
(2). The proposed spatial coupling codes have good performance at short code length which is suitable for short packet massive user network.
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| Strategy for Future Research Activity |
平成30年度はショットパケット伝送する大規模センサネットワークに適用するsignature 符号の構成をしてみる。
(1). 代数的な Signature 符号の構成:これまで提案したSignature 符号を使えば、全ユーザの活動状態を検出可能であるが、これをそのまま、ごく一部のユーザアクティブであるようなショットパケット伝送する大規模センサネットワークに適用するのは、伝送効率の点で好ましくない。代数的な方法で、ごく一部ユーザがアクティブである検出する伝送効率のよいSignature 符号を構成する。
(2). 圧縮センシングよる Signature 符号の構成:Signature 符号化は、スバース圧縮センシングの仕組みとほぼ一致している。その違いは、Signature 行列は2元体上で構成し、検出対象がユーザのアクティブ状態 1 とアイドル状態 0 になるということである。よって，圧縮センシング技術により、Signature 符号を構成する。
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