Signal Processing
Acquisition and processing of information.
Our research in the area of signal processing encompasses a wide range of work in the areas of communications, sensing, estimation, localization, and speech and visual information processing. We explore novel approaches for signal acquisition and coding, methods to filter and recover signals in the presence of noise and other degrading factors, and techniques that infer meaning from the processed signals.
Quick Links
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Researchers
Toshiaki
Koike-Akino
Philip V.
Orlik
Kieran
Parsons
Pu
(Perry)
Wang
Ye
Wang
Petros T.
Boufounos
Hassan
Mansour
Stefano
Di Cairano
Dehong
Liu
Bingnan
Wang
Jianlin
Guo
Yebin
Wang
Wataru
Tsujita
Joshua
Rapp
Yanting
Ma
Matthew
Brand
Devesh K.
Jha
Chungwei
Lin
Hongbo
Sun
Jinyun
Zhang
Ankush
Chakrabarty
Anthony
Vetro
Avishai
Weiss
Wael H.
Ali
Vedang M.
Deshpande
Abraham
Goldsmith
Jonathan
Le Roux
Suhas
Lohit
Tim K.
Marks
Abraham P.
Vinod
William S.
Yerazunis
Anoop
Cherian
Radu
Corcodel
Chiori
Hori
Pedro
Miraldo
Saviz
Mowlavi
Huifang
Sun
Kenji
Inomata
Jing
Liu
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Awards
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AWARD MERL intern and Researchers wins 2025 IEEE CCTA Best Student Paper Award Date: August 27, 2025
Awarded to: Yingjie Hu (Student, Intern), Karl Berntorp, Stefano Di Cairano (MERL Researchers)
MERL Contact: Stefano Di Cairano
Research Areas: Control, Dynamical Systems, Signal ProcessingBrief- MERL intern Yingjie Hu was recognized as the winner of the 2025 IEEE CCTA Best Student Paper Award for the paper "Optimal Measurement Projection in GNSS-RTK Factor Graph Optimization" written in collaboration with MERL Researchers Karl Berntorp and Stefano Di Cairano during the internship at MERL
The paper develops methods for measurement projections for reducing the computational burden of factor graph optimization algorithms in GNSS applications, thus enabling their use in real-time in a wider range of positioning applications.
The IEEE Conference on Control Technology and Application is the conference of the IEEE Control Systems Society focused on applications and technological advances of control systems
- MERL intern Yingjie Hu was recognized as the winner of the 2025 IEEE CCTA Best Student Paper Award for the paper "Optimal Measurement Projection in GNSS-RTK Factor Graph Optimization" written in collaboration with MERL Researchers Karl Berntorp and Stefano Di Cairano during the internship at MERL
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AWARD Best paper award at PHMAP 2023 Date: September 14, 2023
Awarded to: Dehong Liu, Anantaram Varatharajan, and Abraham Goldsmith
MERL Contacts: Abraham Goldsmith; Dehong Liu
Research Areas: Electric Systems, Signal ProcessingBrief- MERL researchers Dehong Liu, Anantaram Varatharajan, and Abraham Goldsmith were awarded one of three best paper awards at Asia Pacific Conference of the Prognostics and Health Management Society 2023 (PHMAP23) held in Tokyo from September 11th to 14th, 2023, for their co-authored paper titled 'Extracting Broken-Rotor-Bar Fault Signature of Varying-Speed Induction Motors.'
PHMAP is a biennial international conference specialized in prognostics and health management. PHMAP23 attracted more than 300 attendees from worldwide and published more than 160 regular papers from academia and industry including aerospace, production, civil engineering, electronics, and so on.
- MERL researchers Dehong Liu, Anantaram Varatharajan, and Abraham Goldsmith were awarded one of three best paper awards at Asia Pacific Conference of the Prognostics and Health Management Society 2023 (PHMAP23) held in Tokyo from September 11th to 14th, 2023, for their co-authored paper titled 'Extracting Broken-Rotor-Bar Fault Signature of Varying-Speed Induction Motors.'
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AWARD MERL’s Paper on Wi-Fi Sensing Earns Top 3% Paper Recognition at ICASSP 2023, Selected as a Best Student Paper Award Finalist Date: June 9, 2023
Awarded to: Cristian J. Vaca-Rubio, Pu Wang, Toshiaki Koike-Akino, Ye Wang, Petros Boufounos and Petar Popovski
MERL Contacts: Petros T. Boufounos; Toshiaki Koike-Akino; Pu (Perry) Wang; Ye Wang
Research Areas: Artificial Intelligence, Communications, Computational Sensing, Dynamical Systems, Machine Learning, Signal ProcessingBrief- A MERL Paper on Wi-Fi sensing was recognized as a Top 3% Paper among all 2709 accepted papers at the 2023 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2023). Co-authored by Cristian Vaca-Rubio and Petar Popovski from Aalborg University, Denmark, and MERL researchers Pu Wang, Toshiaki Koike-Akino, Ye Wang, and Petros Boufounos, the paper "MmWave Wi-Fi Trajectory Estimation with Continous-Time Neural Dynamic Learning" was also a Best Student Paper Award finalist.
Performed during Cristian’s stay at MERL first as a visiting Marie Skłodowska-Curie Fellow and then as a full-time intern in 2022, this work capitalizes on standards-compliant Wi-Fi signals to perform indoor localization and sensing. The paper uses a neural dynamic learning framework to address technical issues such as low sampling rate and irregular sampling intervals.
ICASSP, a flagship conference of the IEEE Signal Processing Society (SPS), was hosted on the Greek island of Rhodes from June 04 to June 10, 2023. ICASSP 2023 marked the largest ICASSP in history, boasting over 4000 participants and 6128 submitted papers, out of which 2709 were accepted.
- A MERL Paper on Wi-Fi sensing was recognized as a Top 3% Paper among all 2709 accepted papers at the 2023 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2023). Co-authored by Cristian Vaca-Rubio and Petar Popovski from Aalborg University, Denmark, and MERL researchers Pu Wang, Toshiaki Koike-Akino, Ye Wang, and Petros Boufounos, the paper "MmWave Wi-Fi Trajectory Estimation with Continous-Time Neural Dynamic Learning" was also a Best Student Paper Award finalist.
See All Awards for Signal Processing -
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News & Events
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NEWS Jianlin Guo delivered a Keynote in IEEE ICC 2025 Workshop Date: June 8, 2025 - June 12, 2025
MERL Contacts: Jianlin Guo; Kieran Parsons
Research Areas: Communications, Signal ProcessingBrief- Jianlin Guo delivered a keynote titled "Multipath Transport in Industrial Private Wireless IoT Networks" in the IEEE International Conference on Communications (ICC) 2025 Workshop on "Industrial Private Beyond-5G Wireless Networks", held in Montreal, Canada from June 8-12. Jianlin also presented two conference papers, two workshop papers, and chaired two technical sessions. The ICC is one of two IEEE Communications Society’s flagship conferences.
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NEWS Toshiaki Koike-Akino to give a tutorial talk at ISIT 2025 Quantum Hackathon Date: June 22, 2025
Where: IEEE International Symposium on Information Theory (ISIT)
MERL Contact: Toshiaki Koike-Akino
Research Areas: Artificial Intelligence, Communications, Data Analytics, Machine Learning, Optimization, Signal Processing, Human-Computer Interaction, Information SecurityBrief- Toshiaki Koike-Akino is invited to present a tutorial talk at IEEE ISIT 2025 Quantum Hackathon, to be held at Ann Arbor, Michigan, USA. The talk, entitled "Emerging Quantum AI Technology", will discuss the recent trends, challenges, and applications of quantum artificial intelligence (QAI) technologies.
The ISIT 2025 Quantum Hackathon invites participants to explore the intersection of quantum computing and information theory. Participants will work with quantum simulators, available quantum hardware, and state-of-the-art development kits to create innovative solutions that connect quantum advancements with challenges in communication and signal processing.
The IEEE International Symposium on Information Theory (ISIT) is the flagship conference of the IEEE Information Theory Society. The symposium centers around the presentation in all of the areas of information theory, including source and channel coding, communication theory and systems, cryptography and security, detection and estimation, networks, pattern recognition and learning, statistics, stochastic processes and complexity, and signal processing.
- Toshiaki Koike-Akino is invited to present a tutorial talk at IEEE ISIT 2025 Quantum Hackathon, to be held at Ann Arbor, Michigan, USA. The talk, entitled "Emerging Quantum AI Technology", will discuss the recent trends, challenges, and applications of quantum artificial intelligence (QAI) technologies.
See All News & Events for Signal Processing -
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Research Highlights
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Recent Publications
- , "SCC-Aided INR for High-Frequency Detail Preservation in LiDAR", IEEE Open Journal of the Communications Society (OJCOMS), September 2025.BibTeX TR2025-129 PDF
- @article{Kuwabara2025sep,
- author = {Kuwabara, Akihiro and Kato, Sorachi and Koike-Akino, Toshiaki and Fujihashi, Takuya},
- title = {{SCC-Aided INR for High-Frequency Detail Preservation in LiDAR}},
- journal = {IEEE Open Journal of the Communications Society (OJCOMS)},
- year = 2025,
- month = sep,
- url = {https://www.merl.com/publications/TR2025-129}
- }
- , "End-to-End Radar Human Segmentation with Differentiable Positional Encoding", European Signal Processing Conference (EUSIPCO), August 2025.BibTeX TR2025-125 PDF
- @inproceedings{Yataka2025aug,
- author = {Yataka, Ryoma and Wang, Pu and Boufounos, Petros T. and Takahashi, Ryuhei},
- title = {{End-to-End Radar Human Segmentation with Differentiable Positional Encoding}},
- booktitle = {European Signal Processing Conference (EUSIPCO)},
- year = 2025,
- month = aug,
- url = {https://www.merl.com/publications/TR2025-125}
- }
- , "Optimal Measurement Projection in GNSS-RTK Factor Graph Optimization", IEEE Conference on Control Technology and Applications (CCTA), August 2025.BibTeX TR2025-118 PDF
- @inproceedings{Hu2025aug,
- author = {Hu, Yingjie and {Di Cairano}, Stefano and Berntorp, Karl},
- title = {{Optimal Measurement Projection in GNSS-RTK Factor Graph Optimization}},
- booktitle = {IEEE Conference on Control Technology and Applications (CCTA)},
- year = 2025,
- month = aug,
- url = {https://www.merl.com/publications/TR2025-118}
- }
- , "Dynamic Sensor Scheduling for Spatio-temporal Monitoring of Water Bodies", IEEE Conference on Control Technology and Applications (CCTA), August 2025.BibTeX TR2025-117 PDF
- @inproceedings{Deshpande2025aug,
- author = {Deshpande, Vedang M. and Vinod, Abraham P.},
- title = {{Dynamic Sensor Scheduling for Spatio-temporal Monitoring of Water Bodies}},
- booktitle = {IEEE Conference on Control Technology and Applications (CCTA)},
- year = 2025,
- month = aug,
- url = {https://www.merl.com/publications/TR2025-117}
- }
- , "Multi-Band Wi-Fi Neural Dynamic Fusion", IEEE Transactions on Wireless Communications, July 2025.BibTeX TR2025-115 PDF
- @article{Kato2025jul,
- author = {Kato, Sorachi and Wang, Pu and Koike-Akino, Toshiaki and Fujihashi, Takuya and Mansour, Hassan and Boufounos, Petros T.},
- title = {{Multi-Band Wi-Fi Neural Dynamic Fusion}},
- journal = {IEEE Transactions on Wireless Communications},
- year = 2025,
- month = jul,
- url = {https://www.merl.com/publications/TR2025-115}
- }
- , "Policy Optimization for PDE Control with a Warm Start", American Control Conference (ACC), July 2025.BibTeX TR2025-105 PDF
- @inproceedings{Zhang2025jul,
- author = {Zhang, Xiangyuan and Mowlavi, Saviz and Benosman, Mouhacine and Basar, Tamer},
- title = {{Policy Optimization for PDE Control with a Warm Start}},
- booktitle = {American Control Conference (ACC)},
- year = 2025,
- month = jul,
- url = {https://www.merl.com/publications/TR2025-105}
- }
- , "GNSS-RTK Factor Graph Optimization with Adaptive Ambiguity Noise", American Control Conference (ACC), July 2025.BibTeX TR2025-102 PDF
- @inproceedings{Hu2025jul,
- author = {Hu, Yingjie and {Di Cairano}, Stefano and Berntorp, Karl},
- title = {{GNSS-RTK Factor Graph Optimization with Adaptive Ambiguity Noise}},
- booktitle = {American Control Conference (ACC)},
- year = 2025,
- month = jul,
- url = {https://www.merl.com/publications/TR2025-102}
- }
- , "Machine Learning-Powered Radio Frequency Sensing: A Review", IEEE Sensors Journal, June 2025.BibTeX TR2025-099 PDF
- @article{Santra2025jun,
- author = {Santra, Avik and Wang, Pu and Shaker, George and Mysore, Bhavani Shankar and Dolmans, Guido and Chen, Yan and Shariati, Negin and Pandharipande, Ashish},
- title = {{Machine Learning-Powered Radio Frequency Sensing: A Review}},
- journal = {IEEE Sensors Journal},
- year = 2025,
- month = jun,
- url = {https://www.merl.com/publications/TR2025-099}
- }
- , "SCC-Aided INR for High-Frequency Detail Preservation in LiDAR", IEEE Open Journal of the Communications Society (OJCOMS), September 2025.
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Videos
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Software & Data Downloads
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Learned Born Operator for Reflection Tomographic Imaging -
Stabilizing Subject Transfer in EEG Classification with Divergence Estimation -
Radar dEtection TRansformer -
Millimeter-wave Multi-View Radar Dataset -
Nonparametric Score Estimators -
Convergent Inverse Scattering using Optimization and Regularization -
One-Bit CRB
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