2020 Fiscal Year Research-status Report
| Project/Area Number |
20K04493
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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) |
2020-04-01 – 2023-03-31
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| Keywords | wireless communications / massive random-access / slotted ALOHA / density evolution / finite blocklength / fading channels |
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| Outline of Annual Research Achievements |
We are progressing according to the original plan in 2020, and achieved the following results. We consider massive random access wireless communications, where devices communicate their packets in a bursty manner at random times. We use code theory to build random access schemes for the communications. Specifically, we apply the spatial coupling concept to the massive random-access wireless communication systems, and give a performance analysis of the massive random access wireless communication systems.
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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 2020.
We have shown that utilization of the device-specific channel state information improves the performance of the massive multiple-access wireless communications. We have proposed a spatially-coupled coded slotted ALOHA systems with finite-length packet transmission over quasi-static Rayleigh fading channels. We derive a cumulative density function of SIR, and thus give a closed-form expression of an average packet error probability at the SIR with short packets for the Rayleigh fading channels. The density evolution gives the decoding performance of these systems. Since the device-specific channel state information is utilized for separating signals form devices, the proposed systems outperform the conventional systems.
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| Strategy for Future Research Activity |
Research will proceed according to the original plan. In the second year, we further investigate the spatially-coupled coded slotted ALOHA systems over quasi-static Rayleigh fading channels, and give an analysis, and asymptotic performance. Moreover, we have some attempt in the research direction of massive unsourced massive random-access schemes over fading channel for the wireless communications in 2021.
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| Causes of Carryover |
コロナ禍で，国際会議や国内会議への現地参加ができなかったため．２０２１年度に，Australiaで開催する国際会議 IEEE International Symposium on Information Theoryや国内開催の情報理論とその応用シンポジウムに参加する予定です．
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Research Products
(8 results)
