2022 Fiscal Year Final Research Report
Design of Belief Propagation for mmWave Large MIMO Detection with Low-Precision ADCs
| Project/Area Number |
20K14734
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 21020:Communication and network engineering-related
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| Research Institution | Osaka University |
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Principal Investigator |
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | 大規模MIMO / ミリ波通信 / 確率伝搬法 / 低分解能ADC / 量子化 / 通信路符号化 / 信号検出 / 通信路推定 |
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| Outline of Final Research Achievements |
Millimeter-wave massive multi-user MIMO is one of the essential technologies in physical layer of wireless communications for accommodating a large number of uplink wireless devices simultaneously over the limited time-frequency resources. In order to fully exploit its potential, in this project we focused on the receiver design and proposed low-complexity and high-accuracy signal detection algorithms based on Bayesian inference. Specifically, assuming the use of low-resolution ADCs to reduce the cost of base stations, we considered a message-passing de-quantization method that achieves highly accurate signal detection while compensating for non-linear quantization distortion. Assuming the use of receive digital beamforming, we also devised a dimensionality reduction method that takes advantage of the sparse property found in millimeter-wave channels in the angular-domain to achieve significantly lower computational complexity without degrading signal detection accuracy.
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| Free Research Field |
無線通信システム・信号処理
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| Academic Significance and Societal Importance of the Research Achievements |
内閣府が提唱するSociety 5.0では，仮想世界 (サイバー空間) と現実世界 (フィジカル空間) を高度に接続することで，新たな価値やサービスを創造する未来社会が描かれており，その実現が，現在日本が直面している様々な社会問題の解決への糸口となっている．二つの世界 (空間) の高度かつ柔軟な接続を可能とする主たる担い手として無線通信システムがあり，特に，現実世界の情報を仮想世界へ伝送・集約する上り回線の無線通信技術の発展が急務となっている．上り回線の無線物理層技術の高度化に貢献する本研究成果は，将来の無線通信システム，ひいては未来社会を支える重要な情報基盤技術へとつながるものである．
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