MERL - Mitsubishi Electric Research Laboratories

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Rui Ma

Rui Ma
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  • Biography

    Prior to joining MERL in 2012, Rui was a Senior Power Amplifier Research Engineer at Nokia Siemens Networks. His research interests include RF Power Device Modeling, Power Amplifier / Radio Front-End Architectures, non-linear microwave circuit design, and high frequency measurement techniques. He is an Associate Editor of IEEE Transactions on Microwave Theory and Techniques, and Associate Editor of IEEE Journal of Electromagnetics, RF and Microwaves in Medicine and Biology.

  • Recent News & Events

    •  TALK   Prof. Pere Gilabert gave an invited talk at MERL on Machine Learning for Digital Predistortion Linearization of High Efficient Power Amplifier
      Date & Time: Tuesday, February 16, 2021; 11:00-12:00
      Speaker: Prof. Pere Gilabert, Universitat Politecnica de Catalunya, Barcelona, Spain
      MERL Host: Rui Ma
      Research Areas: Communications, Electronic and Photonic Devices, Machine Learning, Signal Processing
      Brief
      • Digital predistortion (DPD) linearization is the most common and spread solution to cope with power amplifiers (PA) inherent linearity versus efficiency trade-off. The use of new radio 5G spectrally efficient signals with high peak-to-average power ratios (PAPR) occupying wider bandwidths only aggravates such compromise. When considering wide bandwidth signals, carrier aggregation or multi-band configurations in high efficient transmitter architectures, such as Doherty PAs, load-modulated balanced amplifiers, envelope tracking PAs or outphasing transmitters, the number of parameters required in the DPD model to compensate for both nonlinearities and memory effects can be unacceptably high. This has a negative impact in the DPD model extraction/adaptation, because it increases the computational complexity and drives to over-fitting and uncertainty.
        This talk will discuss the use of machine learning techniques for DPD linearization. The use of artificial neural networks (ANNs) for adaptive DPD linearization and approaches to reduce the coefficients adaptation time will be discussed. In addition, an overview on several feature-extraction techniques used to reduce the number of parameters of the DPD linearization system as well as to ensure proper, well-conditioned estimation for related variables will be presented.
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    •  NEWS   M. Benosman will give an invited talk at the Industrial and Applied Mathematics (SIAM) Student Chapter at Virginia Tech.
      Date: October 9, 2020
      MERL Contact: Mouhacine Benosman
      Research Area: Dynamical Systems
      Brief
      • M. Benosman will give an invited talk at the SIAM student chapter at Virginia Tech. to speak about several applications of mathematics to industrial problems.

        The Society for Industrial and Applied Mathematics (SIAM) Student Chapter at Virginia Tech will host a number of talks by mathematicians working in industry. The speakers will describe the path they followed to reach this point in their careers and also tell us more about their industry and how mathematics is used.
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    See All News & Events for Rui

  • Awards

    •  AWARD   Former Intern Receives IBM Scientific Award Honorable Mention
      Date: January 16, 2019
      Awarded to: Daniel Dinis
      MERL Contact: Rui Ma
      Research Areas: Communications, Signal Processing
      Brief
      • Former MERL intern Daniel Dinis from University of Aveiro (UA), Portugal has received the 2018 IBM Scientific Award with Honorable Mention referring to the contributions on "Real-time Tunable Delta-sigma modulators for All-Digital RF Transmitters" in his Ph.D. study.

        The award-winning work includes research conducted under the supervision of Arnaldo Oliveira and José Neto Vieira, professors from the Department of Electronics and Information Technology (DETI) of the UA, as well as contributions made during Daniel's 7 month internship in 2017 at MERL.

        The ceremony for the presentation of the 28th IBM Scientific Prize took on January 16th, at the Noble Hall of the Superior Technical Institute. It was chaired by Marcelo Rebelo de Sousa, President of the Portuguese Republic.
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  • MERL Publications

    •  Yamashita, G., Tsujita, W., Tsutada, H., Ma, R., Wang, P., Orlik, P.V., "Evaluation of Position Error of Terahertz Polarimetric Encoder By Ray-Tracing Method", International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), DOI: 10.1109/​IRMMW-THz46771.2020.9370683, November 2020, pp. 1-2.
      BibTeX TR2020-145 PDF
      • @inproceedings{Yamashita2020nov,
      • author = {Yamashita, Genki and Tsujita, Wataru and Tsutada, Hiroyuki and Ma, Rui and Wang, Pu and Orlik, Philip V.},
      • title = {Evaluation of Position Error of Terahertz Polarimetric Encoder By Ray-Tracing Method},
      • booktitle = {International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)},
      • year = 2020,
      • pages = {1--2},
      • month = nov,
      • doi = {10.1109/IRMMW-THz46771.2020.9370683},
      • issn = {2162-2035},
      • isbn = {978-1-7281-6621-6},
      • url = {https://www.merl.com/publications/TR2020-145}
      • }
    •  Komatsuszaki, Y., Ma, R., Sakata, S., Nakatani, K., Shinjo, S., "A Dual-Mode Bias Circuit Enabled GaN Doherty Amplifier Operating in 0.85-2.05GHz and 2.4-4.2GHz", IEICE Society Conference, September 2020.
      BibTeX IEICE Society Conference 2020
      • @inproceedings{Komatsuszaki2020sep,
      • author = {Komatsuszaki, Yuji and Ma, Rui and Sakata, Shuichi and Nakatani, Keigo and Shinjo, Shintaro},
      • title = {A Dual-Mode Bias Circuit Enabled GaN Doherty Amplifier Operating in 0.85-2.05GHz and 2.4-4.2GHz},
      • booktitle = {IEICE Society Conference},
      • year = 2020,
      • month = sep,
      • url = {https://www.ieice-taikai.jp/2020society/en/index.html}
      • }
    •  Sakata, S., Kato, K., Teranishi, E., Sugitani, T., Ma, R., Chuang, K., Wu, Y., Fukunaga, K., Komatsuszaki, Y., Kenichi, H., Yamanaka, K., Shinjo, S., "A Fully-Integrated GaN Doherty Power Amplifier Module with a Compact Frequency-Dependent Compensation Circuit for 5G massive MIMO Base Stations", IEEE International Microwave Symposium (IMS), DOI: 10.1109/​IMS30576.2020.9223897, June 2020, pp. 711-714.
      BibTeX TR2020-077 PDF
      • @inproceedings{Sakata2020jun,
      • author = {Sakata, Shuichi and Kato, Katsuya and Teranishi, Eri and Sugitani, Takumi and Ma, Rui and Chuang, Kevin and Wu, Yuchen and Fukunaga, Kei and Komatsuszaki, Yuji and Kenichi, Horiguchi and Yamanaka, Koji and Shinjo, Shintaro},
      • title = {A Fully-Integrated GaN Doherty Power Amplifier Module with a Compact Frequency-Dependent Compensation Circuit for 5G massive MIMO Base Stations},
      • booktitle = {IEEE International Microwave Symposium (IMS)},
      • year = 2020,
      • pages = {711--714},
      • month = jun,
      • publisher = {IEEE},
      • doi = {10.1109/IMS30576.2020.9223897},
      • issn = {2576-7216},
      • isbn = {978-1-7281-6816-6},
      • url = {https://www.merl.com/publications/TR2020-077}
      • }
    •  Komatsuszaki, Y., Ma, R., Sakata, S., Nakatani, K., Shinjo, S., "A Dual-Mode Bias Circuit Enabled GaN Doherty Amplifier Operating in 0.85-2.05GHz and 2.4-4.2GHz", IEEE International Microwave Symposium (IMS), DOI: 10.1109/​IMS30576.2020.9223999, June 2020, pp. 277-280.
      BibTeX TR2020-080 PDF
      • @inproceedings{Komatsuszaki2020jun,
      • author = {Komatsuszaki, Yuji and Ma, Rui and Sakata, Shuichi and Nakatani, Keigo and Shinjo, Shintaro},
      • title = {A Dual-Mode Bias Circuit Enabled GaN Doherty Amplifier Operating in 0.85-2.05GHz and 2.4-4.2GHz},
      • booktitle = {IEEE International Microwave Symposium (IMS)},
      • year = 2020,
      • pages = {277--280},
      • month = jun,
      • publisher = {IEEE},
      • doi = {10.1109/IMS30576.2020.9223999},
      • issn = {2576-7216},
      • isbn = {978-1-7281-6815-9},
      • url = {https://www.merl.com/publications/TR2020-080}
      • }
    •  Sravan Kumar, P., Ma, R., "Design Considerations and FPGA Implementation of a Wideband All-Digital Transmit Beamformer with 50% Fractional Bandwidth", IEEE International Microwave Symposium (IMS), DOI: 10.1109/​IMS30576.2020.9223888, June 2020, pp. 1073-1076.
      BibTeX TR2020-078 PDF
      • @inproceedings{SravanKumar2020jun,
      • author = {Sravan Kumar, Pulipati and Ma, Rui},
      • title = {Design Considerations and FPGA Implementation of a Wideband All-Digital Transmit Beamformer with 50% Fractional Bandwidth},
      • booktitle = {IEEE International Microwave Symposium (IMS)},
      • year = 2020,
      • pages = {1073--1076},
      • month = jun,
      • publisher = {IEEE},
      • doi = {10.1109/IMS30576.2020.9223888},
      • issn = {2576-7216},
      • isbn = {978-1-7281-6815-9},
      • url = {https://www.merl.com/publications/TR2020-078}
      • }
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  • Videos

  • MERL Issued Patents

    • Title: "Methods and Systems for Terahertz-Based Positioning"
      Inventors: Wang, Pu; Fu, Haoyu; Orlik, Philip V.; Koike-Akino, Toshiaki; Ma, Rui; Wang, Bingnan
      Patent No.: 10,795,151
      Issue Date: Oct 6, 2020
    • Title: "Mixed-mode Millimeter-wave Transmitter"
      Inventors: Ma, Rui; Da Cos, Daniel Antonio; Nagai, Yukimasa
      Patent No.: 10,560,126
      Issue Date: Feb 11, 2020
    • Title: "System and Method for Generating High Speed Digitized-RF Signals"
      Inventors: Ma, Rui; Da Cos, Daniel Antonio; Nagai, Yukimasa
      Patent No.: 10,523,478
      Issue Date: Dec 31, 2019
    • Title: "High Speed Digital Bit Generator for Optical Frontal Interface"
      Inventors: Ma, Rui; Da Cos, Daniel Antonio; Nagai, Yukimasa
      Patent No.: 10,516,420
      Issue Date: Dec 24, 2019
    • Title: "Power Amplifier System and Learning-based Autotuning Method Thereof"
      Inventors: Ma, Rui; Benosman, Mouhacine; Manjunatha, Koushik; Niu, Sufeng; Da Cos, Daniel Antonio
      Patent No.: 10,454,427
      Issue Date: Oct 22, 2019
    • Title: "Digital Beamforming Transmitter Array System with Hardware Sharing and Reduction"
      Inventors: Wang, Bingnan; Peng, Zhengyu; Kim, Kyeong-Jin; Wang, Pu; Ma, Rui; Teo, Koon Hoo
      Patent No.: 10,270,510
      Issue Date: Apr 23, 2019
    • Title: "Multi-band radio frequency transmitter"
      Inventors: Ma, Rui; Da Cos, Daniel Antonio; Teo, Koon Hoo; Orlik, Philip V.
      Patent No.: 10,187,232
      Issue Date: Jan 22, 2019
    • Title: "Noise Mitigating Quantizer for Reducing Nonlinear Distortion in Digital Signal Transmission"
      Inventors: Ma, Rui; Tanovic, Omer
      Patent No.: 10,177,776
      Issue Date: Jan 8, 2019
    • Title: "Methods and System of a Digital Transmitter with Reduced Quantization Noise"
      Inventors: Ma, Rui; Da Cos, Daniel Antonio
      Patent No.: 10,128,875
      Issue Date: Nov 13, 2018
    • Title: "Inter-Band CA Digital Transmitter with Multi-Stage Out-of-Band Noise Canceller"
      Inventors: Ma, Rui; Chung, SungWon; Teo, Koon Hoo
      Patent No.: 9,985,667
      Issue Date: May 29, 2018
    • Title: "Impedance Flattening Network for High Efficiency Wideband Doherty Power Amplifier"
      Inventors: Ma, Rui; Ali, Sheikh Nijam; Teo, Koon Hoo
      Patent No.: 9,948,246
      Issue Date: Apr 17, 2018
    • Title: "Wideband Self-Envelope Tracking RF Power Amplifier"
      Inventors: Ma, Rui; Teo, Koon Hoo; Chung, SungWon
      Patent No.: 9,780,730
      Issue Date: Oct 3, 2017
    • Title: "System and Method for Linearizing Power Amplifiers"
      Inventors: Koike-Akino, Toshiaki; Zhu, Qiuyao; Ma, Rui; Teo, Koon Hoo
      Patent No.: 9,749,163
      Issue Date: Aug 29, 2017
    • Title: "Method to Generate Multilevel Inverter Modulation Control Signals"
      Inventors: Duan, Chunjie; Teo, Koon Hoo; Ma, Rui
      Patent No.: 9,559,610
      Issue Date: Jan 31, 2017
    • Title: "Three-Way Sequential Power Amplifier System for Wideband RF Signal"
      Inventors: Ma, Rui; Shao, Jin; Teo, Koon Hoo
      Patent No.: 9,503,028
      Issue Date: Nov 22, 2016
    • Title: "System and Method for Generating Multi-Band Signal"
      Inventors: Ma, Rui; Chung, SungWon; Teo, Koon Hoo
      Patent No.: 9,294,079
      Issue Date: Mar 22, 2016
    • Title: "System and Method for Linearizing Power Amplifiers"
      Inventors: Koike-Akino, Toshiaki; Zhu, Qiuyao; Ma, Rui; Teo, Koon Hoo
      Patent No.: 9,270,504
      Issue Date: Feb 23, 2016
    • Title: "Output Matching Network for Wideband Power Amplifier with Harmonic Suppression"
      Inventors: Ma, Rui; Chung, SungWon; Teo, Koon Hoo
      Patent No.: 9,231,550
      Issue Date: Jan 5, 2016
    • Title: "Digital Power Encoder for Direct Digital-RF Transmitter"
      Inventors: Ma, Rui; Zhu, Qiuyao; Teo, Koon Hoo; Duan, Chunjie
      Patent No.: 9,100,265
      Issue Date: Aug 4, 2015
    • Title: "System and Method for Linearizing Power Amplifiers"
      Inventors: Ma, Rui; Zhu, Qiuyao; Teo, Koon Hoo; Duan, Chunjie
      Patent No.: 9,054,940
      Issue Date: Jun 9, 2015
    • Title: "Reconfigurable Output Matching Network for Multiple Power Mode Power Amplifiers"
      Inventors: Ma, Rui; Goswami, Sushmit; Teo, Koon Hoo; Duan, Chunjie
      Patent No.: 8,963,644
      Issue Date: Feb 24, 2015
    • Title: "Digital Power Encoder for Direct Digital-RF Transmitter"
      Inventors: Ma, Rui; Zhu, Qiuyao; Teo, Koon Hoo; Duan, Chunjie
      Patent No.: 8,953,670
      Issue Date: Feb 10, 2015
    • Title: "High Electron Mobility Transistor with Multiple Channels"
      Inventors: Teo, Koon Hoo; Feng, Peijie; Ma, Rui
      Patent No.: 8,907,378
      Issue Date: Dec 9, 2014
    See All Patents for MERL