| Project/Area Number |
20K04493
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 21020:Communication and network engineering-related
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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 – 2024-03-31
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| Project Status |
Completed (Fiscal Year 2023)
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| Budget Amount *help |
¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2022: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2021: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2020: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
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| Keywords | wireless communications / sensor networks / massive random-access / channel coding / fading channel / slotted ALOHA / density evolution / finite blocklength / fading channels / ランダムアクセス方式 / 電波伝搬特性 / 通信路符号化 / センサネットワーク / 多重接続通信路 |
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| Outline of Research at the Start |
電波伝搬特性を生かしたランダムアクセス方式の研究を行う．大規模密集センサネットワークにおいて，一定時間内に一部のアクティブなセンサは，共通符号を用いてアクセスポイントにランダムにパケットを送信する．送信パケットは，センサからの情報でパケット長が短い．アクセスポイントは，衝突が起こったパケットに対して，各デバイスの電波伝搬特性を推定し，それをデバイス識別情報として用い，混信信号を分離する．本研究では，情報理論，符号理論に基づき，電波伝搬特性を活用した共通符号を提案する．ネットワークの最適化を解析し，有限長伝送の理論限界に近づく，低演算量で実現可能な大規模密集センサネットワークの構築を目指す．
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| Outline of Annual Research Achievements |
In this extension year, we extend our work from the irregular repetition slotted ALOHA (IR-SA) scheme to the coded slotted ALOHA (C-SA) scheme. We derive two theoretical bounds of C-SA over fading channels: a belief propagation (BP) threshold and a converse bound. The converse bound expresses an impossibility threshold to be approached and the tight bound is guidelines for the practical implementation of C-SA. The numerical results show that the C-SA scheme provides more flexible values of energy efficiency and higher BP thresholds than those of the IR-SA. The converse bound is tight in the sense that the BP threshold of a spatially coupled scheme is close to it.
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Report
(4 results)
Research Products
(37 results)
