SAITO Masato

写真a

Title

Associate Professor

Researcher Number(JSPS Kakenhi)

30335476
2
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Current Affiliation Organization 【 display / non-display 】

  • Duty   University of the Ryukyus   Faculty of Engineering   School of Engineering_Electronic and Communication Engineering Program   Associate Professor  

  • Concurrently   University of the Ryukyus   Graduate School of Engineering and Science   Interdisciplinary Intelligent Systems Engineering   Associate Professor  

  • Concurrently   University of the Ryukyus   Graduate School of Engineering and Science   Electronic Systems and Devices   Associate Professor  

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University 【 display / non-display 】

  • 1992.04
    -
    1996.03

    Nagoya University   Faculty of Engineering   Department of Electrical, Electronic, and Electronic and Information Engineering   Graduated

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Graduate School 【 display / non-display 】

  • 1996.04
    -
    1998.03

    Nagoya University  Graduate School, Division of Engineering  Department of Electronic and Information Engineering  Doctor's Course (first term)  Completed

  • 1998.04
    -
    2001.03

    Nagoya University  Graduate School, Division of Engineering  Department of Electronic and Information Engineering  Doctor's Course (second term)  Completed

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Study abroad experiences 【 display / non-display 】

  • 2007.04
    -
    2008.03

    Department of Electrical and Electronic Engineering, The University of Melbourne, Visiting Researcher  

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Academic degree 【 display / non-display 】

  • Nagoya University -  Ph. D (Enginnering)

  • Nagoya University -  Master of Science in Engineering

  • Nagoya University -  Bachelor of Science in Engineering

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External Career 【 display / non-display 】

  • 2001.04
    -
    2007.03

    Graduate School of Information Science, Nara Institute of Science and Technology, Assistant Professor  

  • 2006.04
    -
    2007.03

    Department of Economics, Osaka Sangyo University  

  • 2007.04
    -
    2010.03

    Graduate School of Information Science, Nara Institute of Science and Technology, Assistant Professor  

  • 2009.04
    -
    2010.03

    Department of Economics, Osaka Sangyo University  

  • 2010.04
    -
    2017.03

    Department of Electrical and Electronics Engineering, University of the Ryukyus, Associate Professor  

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Affiliated academic organizations 【 display / non-display 】

  • 1995.12
    -
    Now
     

    The Institute of Electronics, Information and Communication Engineers 

  • 1997.01
    -
    Now
     

    The Institute of Electrical and Electronics Engineers 

  • 2011.05
    -
    Now
     

    The Institute of Electronics, Information and Communication Engineers    Member of Technical Committee on Wideband System

  • 2013.05
    -
    Now
     

    The Institute of Electronics, Information and Communication Engineers    Member of Technical Committee on Satellite Communications

  • 2009.05
    -
    2011.05
     

    The Institute of Electronics, Information and Communication Engineers    Secretary of Technical Committee on Wideband System

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Research Interests 【 display / non-display 】

  • Multiple-Input Multiple-Output (MIMO)

  • Orthogonal Frequency Division Multiplexing (OFDM)

  • Stochastic Resonance

  • Antenna Pattern Multiplexing

  • Code Division Multiple Access (CDMA)

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Research Areas 【 display / non-display 】

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Communication and network engineering

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Acquisition of a qualification 【 display / non-display 】

  • Radio Operator License

  • Software Design & Development Engineer/Information Processing Engineer, Class 1

  • TOEIC（730）

  • Land Radio Engineer (1-2 class)

  • Land Special Radio Engineer (1-3 class)

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Research Theme 【 display / non-display 】

  • MIMO communication systems using periodially time-variable directivity antenna

  • Enhancement of achievable rate of multi-hop multi-carrier systems

  • The effect of non-linear amplifier on CDMA systems

  • Cellular systems based on multi-route and multi-hop networks

  • Study on efficient packet communication using Qnasi Synchronous CDMA.

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Published Papers 【 display / non-display 】

  • RSSI-Based Localization Enhancement by Exploiting Interference Signals

    Hiroyuki Hatano, Seiya Horiuchi, Kosuke Sanada, Kazuo Mori, Takaya Yamazato, Shintaro Arai, Masato Saito, Yukihiro Tadokoro, and Hiroya Tanaka

    IEICE Transactions on Communications ( IEICE )  E108-B ( 2 )   2025.02 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

    　View Summary

    Received Signal Strength Indicator (RSSI)-based localization is of interest in indoor localization systems. In this study, we propose a method to improve localization accuracy using interference-oriented fluctuation. We estimate the distance between target and beacon nodes by utilizing the nodes located around them. When the beacon node transmits a signal to the target for measuring the distance, the surrounding nodes also transmit a copy of the signal. Such signals cause interference patterns at the beacon, thereby randomizing the RSSI. Our developed statistical signal processing enables the estimation of the strength of the received signal with the randomized RSSI. We numerically show that the distance between the target and beacon nodes is estimated with lower error than when using the conventional method. In addition, such accurate distance estimation allows significant improvement in localization performance. Our approach is useful for indoor localization systems, for example, those in medical and industrial applications.

  • Noise Power Reducible In-Phase Combining for Signal-to-Power Ratio Improvement of Short-Term Power Delay Profile Estimation

    Fumiya Ojika, Takaya Yamazato, Masato Saito, Hideki Omote, Akihiro Sato, Sho Kimura, Shoma Tanaka, Hoyu Lin

    IEICE Transactions on Communications (Japanese Edition) ( IEICE )  J107-B ( 11 )   2024.11 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

    　View Summary

    In mobile wireless communication systems, accurate channel characterization is crucial. Particularly in channel estimation, reducing noise power relative to the signal and utilizing low signal-to-noise ratio (SNR) signals are essential. Enabling communication in environments with low-SNR signals expands the coverage area of base stations. We propose a novel method for noise reduction utilizing short-term power delay profiles. To Validate its effectiveness, we conducted radio propagation measurements with deliberately weakened signals using attenuators. Assuming propagated paths originate from the same direction, our simulations confirm the feasibility of the proposed method. The method successfully improved the SNR of a 10 dB signal in the short-term power delay profile to 30 dB.

  • 16 QAM-OFDM Receiver Using 1-bit ADC for Noise Utilization Characterization in Fading Channels with Large Amplitude Fluctuations

    Arata Isozaki, Takaya Yamazato, Masato Saito, Shan Lu

    IEICE Communications Express ( 電子情報通信学会 )  X13-B ( 8 )   2024.08 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

    　View Summary

    The performance of 1-bit Analogue-to-Digital Converter (ADC) receivers is vulnerable to degradation in environments with significant signal amplitude fluctuations, due to quantization errors inherent in binary outputs. Thus, it becomes crucial to verify the effectiveness of 1-bit ADC receivers under such conditions. In this study, we conduct an evaluation of previously proposed 1-bit ADC receivers in Rician and Rayleigh fading channels, where both signal amplitude and phase exhibit dynamic fluctuations. We confirm the effectiveness of 1-bit ADC receivers in such fading environments. However, we observe that the degree of degradation of Signal-to-Noise power Ratio (SNR) versus Bit Error Rate (BER) due to signal amplitude and phase variations depends on the employed demodulation method.

  • Low Profile Single/Two-Element Dual-Band Array Antenna for 5th Generation Mobile Communications

    Moynul Hasan Akash, Masato Saito

    Proceedings of 2024 IEEE International Symposium on Antennas and Propagation and ITNC-USNC-URSI Radio Science Meeting ( IEEE )    2024.07 [ Peer Review Accepted ]

    Type of publication: Research paper (international conference proceedings)

    　View Summary

    This paper presents a compact microstrip patch antenna designed for 5G millimeter wave (mmWave) mobile communications. The planar antenna offers two configurations: a single-element design and a dual-band two-element array. The single-element configuration resonates at 38.24 GHz with a bandwidth of 2.89 GHz, while the two-element array antenna demonstrates dual-band resonance at 34.64 GHz and 40.64 GHz, with respective bandwidths of 1.24 GHz and 5.53 GHz. Both configurations maintain satisfactory VSWR range (VSWR < 2) across their operating bands. Each one constructed on a Rogers RT 5580 substrate (tan δ = 0.0009 and ε#Dr#DR = 2.2). The two-element array, within its operating band (37.46 GHz – 42.99 GHz), demonstrates a peak efficiency of 82% and a significant gain of 8.78 dBi. Another band of that array, which ranges from 34.23 to 35.47 GHz, has a radiation efficiency of 61% and a gain of 4.14 dBi at its resonance frequency of 34.64 GHz. In comparison, the single-element antenna delivers efficiency ranging from 53% to 63% and gain varying from 3.8 dBi to 4.3 dBi.

  • Wideband 1x2 Array Microstrip Patch Antenna for 5G-Millimeter-Wave Applications at 59 GHz

    Moynul Hasan Akash, Masato Saito

    Proceedings of 2024 IEEE International Symposium on Antennas and Propagation and ITNC-USNC-URSI Radio Science Meeting ( IEEE )    2024.07 [ Peer Review Accepted ]

    Type of publication: Research paper (international conference proceedings)

    　View Summary

    In this paper, a 1-by-2 array microstrip patch antenna is demonstrated for the fifth generation (5G) millimeter-wave (mmWave) applications that demand a wide range of bandwidth while taking the size constraint into consideration. The substrate chosen for this study is Rogers RT 5880, which has a thickness of 0.5 mm, relative permittivity of 2.2 and a tan δ of 0.0009. To achieve better impedance matching, return loss, gain, and wider bandwidth, a U-shaped slots adjustment was performed on the patch. The proposed antenna exhibits an operating frequency range from 50.38 GHz to 67.79 GHz, resonating at 59 GHz with a 17.4 GHz bandwidth. At the resonant frequency, the antenna achieves a radiation efficiency of 69% and a gain of 7.6 dBi. The maximum radiation efficiency of 73% is observed at 62.52 GHz. Throughout the operational frequency range, the VSWR remains within the acceptance range of 1 < VSWR < 2. Altair FEKO was used to model and simulate the proposed antenna design.

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Books 【 display / non-display 】

  • Array Pattern Optimization

    Masato Saito ( Part: Allotment Writing ,  Antenna Pattern Multiplexing for Enhancing Path Diversity )

    IntechOpen  2020.03

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Other Papers 【 display / non-display 】

  • Sensor Networks

    Journal of Japan Society for Fuzzy Theory and Intelligent Informatics ( Japan Society for Fuzzy Theory and intelligent informatics )  18 ( 5 )   2006

     

    DOI

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Presentations 【 display / non-display 】

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Industrial Property 【 display / non-display 】

  • Receiver

    Industrial Property No 特願2018-001547  (2018.01.09)

    Unexpectedly No 特開2018-160887  (2018.10.11)

    Patent No 特許第7150298号  (2022.09.30)

    Masato Saito

    J-GLOBAL

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Other Research Activities 【 display / non-display 】

  • Editor

    Editing academic journals etc. 

    2019.06
    -
    2021.06

    　View Summary

    Editor of The Institute of Electronics, Information and Communication Engineers Transactions on Fundamentals.

  • Editor

    Editing academic journals etc. 

    2021.06
    -
    2022.06

    　View Summary

    The Institute of Electronics, Information and Communication Engineers

  • Editor

    Editing academic journals etc. 

    2018.06
    -
    2019.05

    　View Summary

    The Institute of Electronics, Information and Communication Engineers

  • Ph. D thesis examiner

    Other Research Activities 

    2019.05
    -
    2019.07

    　View Summary

    Ph. D. thesis examiner of a Ph. D. candidate of Queensland University of Technology, Australia.

  • Editor

    Editing academic journals etc. 

    2018.06
    -
    2022.05

    　View Summary

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences

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Academic Awards 【 display / non-display 】

  • IEICE Engineering Sciences Society Editor-in-Chief in Communications Field

    2021.09.15   IEICE  

    Winner: Masato Saito

  • IEICE Communications Society:Distinguished Contributions Award

    2016.09.21   IEICE Communications Society  

    Winner: Masato Saito

  • IEICE Kyushu Section Gakuseikai Encouragement award

    2014.01   IEICE Kyushu Section  

    Winner: Wataru Arita

  • IEICE Kyushu Section Gakuseikai Encouragement award

    2014.01   IEICE Kyushu Section  

    Winner: Keisuke Fukami

  • IEEE VTS Japan 2012 Young Researcher's Encouragement Award

    2012.09.03   IEEE VTS Japan  

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Grant-in-Aid for Scientific Research 【 display / non-display 】

  • Grant-in-Aid for Scientific Research(B)

    Project Year: 2024.04  -  2029.03 

    Investigator(s): Masato Saito  Member: Takaya Yamazato

    Direct: 14,300,000 (YEN)  Overheads: 4,290,000 (YEN)  Total: 18,590,000 (YEN)

  • Grant-in-Aid for Scientific Research(C)

    Project Year: 2023.04  -  2026.03 

    Investigator(s): Tadahiro Wada  Member: Masato Saito

    Direct: 3,600,000 (YEN)  Overheads: 1,080,000 (YEN)  Total: 4,680,000 (YEN)

  • MIMO-OFDM Receiver using One-Bit Analog-Digital Converter Utilizing Noise

    Grant-in-Aid for Scientific Research(B)

    Project Year: 2020.04  -  2024.03 

    Investigator(s): Takaya Yamazato  Member: Masato Saito

    Direct: 13,700,000 (YEN)  Overheads: 4,110,000 (YEN)  Total: 17,810,000 (YEN)

  • Antenna Pattern Multiplexing Based on Fusion of Variable Directivity Antenna and Signal Multiplexing Technology

    Grant-in-Aid for Scientific Research(C)

    Project Year: 2020.04  -  2023.03 

    Investigator(s): Masato Saito 

    Direct: 3,300,000 (YEN)  Overheads: 990,000 (YEN)  Total: 4,290,000 (YEN)

  • Grant-in-Aid for Young Scientists(B)

    Project Year: 2009.04  -  2011.03 

    Direct: 1,600,000 (YEN)  Overheads: 480,000 (YEN)  Total: 2,080,000 (YEN)

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Joint Research activities 【 display / non-display 】

  • Power consumption reduction of satellite and UAV communications

    Project Year: 2023.04  -  2024.02 

    Investigator(s): Masato Saito  Member: Hiraku Okada  Offer Organization: Nagoya University Institute of Materials and Systems for Sustainability

    Direct: 200,000 (YEN)  Overheads: 0 (YEN)  Total: 200,000 (YEN)

  • Power consumption reduction of satellite and UAV communications

    Project Year: 2022.04  -  2023.02 

    Investigator(s): Masato Saito  Member: Hiraku Okada  Offer Organization: Nagoya University Institute of Materials and Systems for Sustainability

    Direct: 200,000 (YEN)  Overheads: 0 (YEN)  Total: 200,000 (YEN)

  • Power consumption reduction of satellite and UAV communications

    Project Year: 2021.04  -  2022.02 

    Investigator(s): Masato Saito  Member: Hiraku Okada  Offer Organization: Nagoya University Institute of Materials and Systems for Sustainability

    Direct: 300,000 (YEN)  Overheads: 0 (YEN)  Total: 300,000 (YEN)

  • Receive antennas for super low power consumption wireless systems

    Project Year: 2020.04  -  2021.02 

    Investigator(s): Masato Saito  Member: Hiraku Okada  Offer Organization: Nagoya University Institute of Materials and Systems for Sustainability

    Direct: 300,000 (YEN)  Overheads: 0 (YEN)  Total: 300,000 (YEN)

  • Receive antennas for super low power consumption wireless systems

    Project Year: 2019.04  -  2020.02 

    Investigator(s): Masato Saito  Member: Hiraku Okada  Offer Organization: Nagoya University Institute of Materials and Systems for Sustainability

    Direct: 300,000 (YEN)  Overheads: 0 (YEN)  Total: 300,000 (YEN)

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SDGs 【 display / non-display 】

  • アンテナパターン多重技術に関する研究

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Social Activity 【 display / non-display 】

  • 2024.02
    　
    　

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Academic Activities 【 display / non-display 】

  • 総務省沖縄総合通信事務所  （ 総務省沖縄総合通信事務所 ）

    2024.2
    　
    　

    種別： Scientific advice/Review 

    　View Summary

    電波適正利用推進員選考会において推進員の承認を行った．

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