2018 Fiscal Year Research-status Report
空間結合符号のユニバーサル性を活かした多重接続通信の理論限界達成に関する研究
| Project/Area Number |
16K06373
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| Research Institution | Doshisha University |
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Principal Investigator |
程 俊 同志社大学, 理工学部, 教授 (00388042)
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| Project Period (FY) |
2016-04-01 – 2020-03-31
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| Keywords | spatially coupled code / polar code / code length |
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| Outline of Annual Research Achievements |
We are progressing according to the plan in 2018, and achieved the following results.
We have proposed spatial coupled polar codes by associating multiple identical polar codes (base codes) with short length. We have investigated two spatial-coupling schemes. For the first spatial-coupling scheme, part of message bits of the polar code at each coupling position is used as frozen bits of the one-side adjacent polar code. For the second scheme, the multiple polar codes are associated by combining message-bit blocks of adjacent coupling positions with modulo-2 addition.
Simulation results show that, the two schemes of spatially coupled polar codes can provide better error-correcting performance, with a little extra iteration complexity, than original polar codes with short length. Specifically, when setting the coupling ratio at 0.33 and coupling pattern as Uncertain-Certain, the first spatial-coupling scheme provides the best decoding performance. The second one with coupling width 3 provides better performance than that with coupling width 2. Furthermore, the first spatial-coupling scheme with short message block length provides better decoding performance.
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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 summarize in the Research Achievements section, the research work is smoothly progressing according to the plan in 2018. Our proposed spatial coupled polar codes provides performance improvement of multiple short-packets transmission by associating these packets in the spatial coupling scheme.
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| Strategy for Future Research Activity |
Part of this research results in 2018 has been summarized and will be presented in international conferences in 2019 (the extension year).
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| Causes of Carryover |
2018年度の一部の研究成果は，すでに論文にまとめ，2019年度1月に国際会議に投稿しました．補助事業の目的をより精緻に達成するために，2019年7月の国際会議ISITに参加する必要があり，延長を行うこととしました．
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