People
Professors
Jukka Lempiäinen
- Professor
- tietoliikennetekniikka
- Faculty of Information Technology and Communication Sciences
- Tampere University
- +358505115131
- jukka.lempiainen@tuni.fi
-
Mostly on Mondays at 10-12. Also contact by email.
- https://orcid.org/0000-0003-2016-8903
About me
Prof. Lempiäinen has concentrated to propagation of wireless systems, and to system planning challenges of wireless systems.
His mission is to find new revolutionary solutions / applications for mobile communications technology field.
Responsibilities
Head of Radio Network Planning Group (RNP).
More information at www.tuni.fi/rnp
Field of expertise
Prof. Lempiäinen’s research interest includes different aspects of evolution of mobile communications. The evolution understanding contains several system level areas as deep technical details (e.g. need of antenna development) as knowledge of techno-economical approaches as definition of indoor/outdoor service scenarios in multi-technology environment (e.g. 5G vs. WiFi).
Prof. Lempiäinen has also expanded last seven years his knowledge and expertise in the area of critical communication.
Research topics
Critical communication including 5G
Ambient backscattering Communication (ABC)
Single Path Single Access
Research unit
Radio Network Planning Group (RNP). More information at www.tuni.fi/rnp
https://tutcris.tut.fi/portal/fi/persons/jukka-lempiainen(b25a4935-3d89-4e63-ae77-e2ff805247e8).html
His mission is to find new revolutionary solutions / applications for mobile communications technology field.
Examples of this kind of targets are:
- Ultimate need of national emergency mobile network in commercial frequencies for all inhabitants in Finland (inc. also authorities)
- Single Path Single Access = unique frequency reuse at each terminal location
- Passive geothermal cooling for base station sites (saving energy)
- User/Customer guided energy and capacity optimization in mobile networks (inc. operators’ loyalty program = dialogue between operators and users)
URSI national board member 2003-
Simona Lohan
- Professor
- Communications Engineering
- Faculty of Information Technology and Communication Sciences
- Tampere University
- +358408490669
- elena-simona.lohan@tuni.fi
About me
Prof. E.S. Lohan received an MSc degree in Electrical Engineering from Polytechnics University of Bucharest (1997), a DEA degree in Econometrics at Ecole Polytechnique, Paris (1998), and a PhD degree in Telecommunications from Tampere University of Technology (2003). She is now a Full Professor at the Electrical Engineering unit at Tampere University (former Tampere University of Technology) and a Visiting Professor at Universitat Autonoma de Barcelona (UAB), Spain (spcomnav group). She is leading a research group on Signal processing for wireless positioning (www.cs.tut.fi/tlt/pos). She is a co-editor of the first book on Galileo satellite system (Springer "Galileo Positioning technology"), co-editor of a Springer book on "Multi-technology positioning", and author or co-author in more than 250 international peer-reviewed publications, 6 patents and inventions. She is also an associate Editor for RIN Journal of Navigation and for IET Journal on Radar, Sonar, and Navigation. She is now the coordinator of the H2020 MSCA European Joint Doctorate A-WEAR (www.a-wear.eu), 2019-2022.
Field of expertise
signal processing for wireless positioning; GNSS algorithms; wearable computing; privacy-aware indoor and outdoor localization; digital contact tracing; interference detection, mitigation, and classification; RF fingerprinting; IoT localization
Research unit
https://www.tuni.fi/en/about-us/electrical-engineering
Research fields
Wireless positioning, UMTS/WCDMA mobile positioning, GNSS (Galileo, GPS and modernised GPS, GLONASS, Beidou), CDMA signal processing algorithms, baseband receiver processing such as acquisition and tracking, Binary Offset Carrier (BOC) modulation studies, accurate tracking in multipath channels, unambiguous acquisition of BOC/MBOC signals, sidelobe cancellation methods, wireless channel modelling, Carrier To Noise Ratio (CNR) estimators, Simulink-based models for Galileo and GPS receivers, WLAN-based positioning, cellular based positioning, user-driven Location Based Services, user surveys and statistical analysis, compressed sensing for WLAN localisation, 3D localisation and floor detection, spectrum sensing for location purposes, signals of opportunity, 5G positioning, convergence of communication and navigation signals, users mobility models, privacy and physical layer security in mobile localisation, interference detection, classification, mitigation, and localization, location-based beamforming, IoT communication and localization, communication and positioning algorthims for commercial aviation, general aviation and Unmanned Aerial Vehickes (UAVs), location-based e-health applications, industrial internet, etc.
https://tutcris.tut.fi/portal/en/persons/elenasimona-lohan(b46cb183-d168-4ed9-8fed-9451f03e8039)/publications.html
Jari Nurmi
- Professor
- Communications engineering
- Faculty of Information Technology and Communication Sciences
- Tampere University
- +358405064460
- jari.nurmi@tuni.fi
-
Contact by email beforehand.
- https://orcid.org/0000-0003-2169-4606
About me
Over 30 years experience on electronics, computer engineering, communications engineering and positioning technologies, both in academia and industry. Organizing conferences and other events and doctoral education are close to my heart.
Responsibilities
As a professor (since 1999) the main tasks include research fund raising, research management, supervision of doctoral and MSc students, and education and research. Director of national DELTA doctoral training network, head of the European Joint Doctorate A-WEAR at Tampere University, coordinator of APROPOS MSCA ITN, and organizer of several international conferences per year as a chairman or steering group member. Research Integrity Advisor.
Field of expertise
Expertise in embedded processor systems, reconfigurable computing, approximate computing, digital circuits and systems, digital implementations of communications receivers and networks, software-defined radio, software-defined networking, positioning technology (in particular GNSS receiver architectures).
Research career
Research assistant 1987-88, Research Scientist 1988-91, acting Associate Professor 1991-1993, Senior Research Scientist 1994, Vice President (VLSI Solution Oy) 1995-98, Full Professor 1999-
Degrees: MSc (Tech) 1988, Licentiate (Tech) 1990, DSc (Tech) 1994
32 supervised PhD dissertations, examiner or opponent for about 50 PhD dissertations worldwide, over 150 supervised/examined MSc theses, editor of 5 books, awards as conference organizer and innovator.
Head of A-WEAR joint doctoral program at Tampere University, vice chair of the steering group of the international BSc program, steering group member of four international conferences (chairman in two: IEEE Nordic Circuits and Systems Conference, International Conference on Localization and GNSS), member of the VLSI Systems and Applications technical committee at IEEE Circuits and Systems Society, editorial board member in three international scientific journals. Tampere Congress Ambassador. Research Integrity Advisor.
Selected recent publications:
Tiago Troccoli, Juho Pirskanen, Jorge Morte, Aleksandr Ometov, Elena Simona Lohan, Ville Kaseva, and Jari Nurmi, “Efficient Embedded Fixed-Point Direction of Arrival Method,” in IEEE Sensors, vol. 24, no. 6, 15 March 2024. Doi 10.1109/JSEN.2024.3361658.
Hans Jakob Damsgaard, Antoine Grenier, Dewant Katare, Zain Taufique, Salar Shakibhamedan, Tiago Troccoli, Georgios Chatzitsompanis, Anil Kanduri, Aleksandr Ometov, Aaron Yi Ding, Nima Taherinejad, Georgios Karakonstantis, Roger Woods, and Jari Nurmi, “Adaptive Approximate Computing in Edge AI and IoT Applications: A Review,” in Journal of Systems Architecture, Elsevier, 2024.
Antoine Grenier, Jie Lei, Hans Jakob Damsgaard, Enrique S. Quintana-Ortí, Aleksandr Ometov, Elena Simona Lohan, and Jari Nurmi, “Hard SyDR: A Benchmarking Environment for Global Navigation Satellite System Algorithms,” in Sensors, MDPI, 2024.
Majed Imad, Antoine Grenier, Xiaolong Zhang, Jari Nurmi, and Elena Simona Lohan, “Ionospheric Error Models for Satellite-Based Navigation - Paving the Road Towards LEO-PNT Solutions,” in Computers, MDPI, 2024, 13(1), 4, https://doi.org/10.3390/computers13010004.
Antoine Grenier, Elena Simona Lohan, Aleksandr Ometov, and Jari Nurmi, “Towards Smarter Positioning through Analyzing Raw GNSS and Multi-Sensor Data from Android Devices: A Dataset and an Open-Source Application,” in Electronics, MDPI, 2023, 12(23), 4781, https://doi.org/10.3390/electronics12234781.
Aditi Site, Jari Nurmi, and Elena Simona Lohan, “Machine-learning-based diabetes prediction using multi-sensor data,” in IEEE Sensors, 2023, doi: 10.1109/JSEN.2023.3319360.
Pavel Pascacio de Los Santos, Joaquin Torres Sospedra, Sven Casteleyn, Elena Simona Lohan, and Jari Nurmi, “L/F-CIPS: Collaborative indoor positioning for smartphones with lateration and fingerprinting,” in IEEE Sensors, 2023, doi: 10.1109/JSEN.2023.3308147.
Dewant Katare, Diego Perino, Jari Nurmi, Martijn Warnier, Marijn Janssen, and Aaron Yi Ding, “A Survey on Approximate Edge AI for Energy Efficient Autonomous Driving Services,” in IEEE Communications Surveys & Tutorials, 2023, doi: 10.1109/COMST.2023.3302474.
Darwin Quezada-Gaibor, Lucie Klus, Roman Klus, Elena Simona Lohan, Jari Nurmi, Mikko Valkama, Joaquín Huerta, and Joaquín Torres-Sospedra, “Auto-Encoder Extreme Learning Machine for Fingerprint-Based Positioning: A Good Weight Initialization is Decisive,” in IEEE Journal of Indoor and Seamless Positioning and Navigation, vol. 1, 2023, pp. 53-68 doi: 10.1109/JISPIN.2023.3299433.
Hans Jakob Damsgaard, Aleksandr Ometov, Md Munjure Mowla, Adam Flizikowski, and Jari Nurmi, “Approximate Computing in B5G and 6G Wireless Systems: A Survey and Future Outlook,” in Computer Networks, Elsevier, 2023.
Antoine Grenier, Elena Simona Lohan, Aleksandr Ometov, and Jari Nurmi, “A Survey on Low-Power GNSS,” in IEEE Communications Surveys and Tutorials, 2023. doi: 10.1109/COMST.2023.3265841.
Lucie Klus, Roman Klus, Joaquin Torres Sospedra, Elena Simona Lohan, Carlos Granelli, Jari Nurmi, “EWOk: Towards Efficient Multidimensional Compression of Indoor Positioning Datasets,” in IEEE Transactions on Mobile Computing, 2023.
Iñigo Cortés, Johannes Rossouw Van der Merwe, Elena Simona Lohan, Jari Nurmi, and Wolfgang Felber, “Low-Complexity Adaptive Full Direct-State Kalman Filter for Robust GNSS Tracking,” in Sensors, 2023, 23, 3658. https://doi.org/10.3390/s23073658.
Tiago Troccoli, Juho Pirskanen, Jari Nurmi, Aleksandr Ometov, Jorge Morte, Elena Simona Lohan, and Ville Kaseva, “Direction-of-Arrival Method for L-Shaped Array with RF Switch: An Embedded Implementation Perspective,” in Sensors, MDPI, 2023, 23(6), 3356, doi: 10.3390/s23063356.
Aleksandr Ometov, Anzhelika Mezina and Jari Nurmi, "On Applicability of Imagery-Based CNN to Computational Offloading Location Selection," in IEEE Access, vol. 11, pp. 2433-2444, 2023, doi: 10.1109/ACCESS.2022.3232469.
Joaquín Torres-Sospedra, Darwin Quezada Gaibor, Jari Nurmi, Yevgeni Koucheryavy, Elena Simona Lohan, and Joaquin Huerta, “Scalable and Efficient Clustering for Fingerprint-Based Positioning,” in IEEE Internet of Things Journal, vol. 10, no. 4, pp. 3484-3499, Feb.15, 2023, doi: 10.1109/JIOT.2022.3230913.
Hans Jakob Damsgaard, Aleksandr Ometov, and Jari Nurmi, “Approximation Opportunities in Edge Computing Hardware: A Systematic Literature Review,” in ACM Computing Surveys, 2022 (online), doi: 10.1145/3572772.
Aditi Site, Saigopal Vasudevan, Samuel Afolaranmi, Jose L. Martinez Lastra, Jari Nurmi, and Elena Simona Lohan, “A Machine-Learning-Based Analysis of the Relationships between Loneliness Metrics and Mobility Patterns for Elderly,” in Sensors, MDPI, 2022, 22(13), 4946. doi: 10.3390/s22134946.
Iñigo Cortés, Johannes Rossouw van der Merwe, Elena Simona Lohan, Jari Nurmi, and Wolfgang Felber, “Performance Evaluation of Adaptive Tracking Techniques with Direct-State Kalman Filter,” in Sensors, MDPI, 2022, 22(2), 420. doi: 10.3390/s22020420.
Darwin Quezada Gaibor, Joaquín Torres-Sospedra, Jari Nurmi, Yevgeni Koucheryavy, and Joaquín Huerta, “Cloud Platforms for Context-Adaptive Positioning and Localisation in GNSS-denied Scenarios - A Systematic Review,” in Sensors, MDPI, 2022, 22, 110. doi: 10.3390/s22010110
Aleksandr Ometov, Oliver Liombe Molua, Mikhail Komarov, and Jari Nurmi, “A Survey of Security in Cloud, Edge, and Fog Computing,” in Sensors, MDPI, 2022, 22, 927. doi: 10.3390/s22030927.
Aditi Site, Jari Nurmi, and Elena Simona Lohan, “Systematic Review on Machine-Learning Algorithms used in Wearable-based eHealth Data Analysis,” in IEEE Access, 2021, doi: 10.1109/ACCESS.2021.3103268.
Pavel Pascacio, Sven Casteleyn, Joaquin Torres Sospedra, Elena Simona Lohan, and Jari Nurmi, “Collaborative Indoor Positioning Systems: A Systematic Review,” in Sensors, MDPI, 2021, 21, 1002. https://doi.org/10.3390/s21031002.
Lucie Klus, Roman Klus, Elena Simona Lohan, Carlos Granell, Jukka Talvitie, Mikko Valkama, and Jari Nurmi, “Direct Lightweight Temporal Compression for Wearable Sensor Data,” in IEEE Sensors Letters, Jan. 2021, doi: 10.1109/LSENS.2021.3051809.
Iñigo Cortés, Johannes Rossouw van der Merwe, Jari Nurmi, Alexander Rügamer, and Wolfgang Felber, “Evaluation of Adaptive Loop-Bandwidth Tracking Techniques in GNSS Receivers,” in Sensors, MDPI, 2021, 21, 502. https://doi.org/10.3390/s21020502.
Most cited publications (Google Scholar):
Xin Wang, Tapani Ahonen, and Jari Nurmi, “Applying CDMA Technique to Network-on-Chip,” in IEEE Transactions on Very Large Scale Integration (VLSI) Systems, Vol. 15, No. 10, pp. 1091-1100, October 2007.
Jari Nurmi, Hannu Tenhunen, Jouni Isoaho, and Axel Jantsch (Eds.), Interconnect-Centric Design for Advanced SoC and NoC, Kluwer Academic Publishers, 2004, ISBN 1-4020-7835-8.
Pavel Pascacio, Sven Casteleyn, Joaquin Torres Sospedra, Elena Simona Lohan, and Jari Nurmi, “Collaborative Indoor Positioning Systems: A Systematic Review,” in Sensors, MDPI, 2021, 21, 1002. doi: 10.3390/s21031002.
Tapani Ahonen, David Sigüenza Tortosa, and Jari Nurmi, “Topology Optimization for Application-Specific Networks-on-Chip,” in Proc. 6th International Workshop on System Level Interconnect Prediction, Paris, France, February 14-15, 2004.
Jari Nurmi (Ed.), Processor Design: System-on-Chip Computing for ASICs and FPGAs, Springer, 2007, ISBN 978-1-4020-5529-4.
Aleksandr Ometov, Oliver Liombe Molua, Mikhail Komarov, and Jari Nurmi, “A Survey of Security in Cloud, Edge, and Fog Computing,” in Sensors, MDPI, 2022, 22(3), 927. doi: 10.3390/s22030927.
Ilkka Saastamoinen, David Sigüenza Tortosa and Jari Nurmi, ”Interconnect IP Node for Future System-on-Chip Designs,” in Proc. 1st International Workshop on Electronic Design, Test & Applications Delta2002, Christchurch, New Zealand, January 29-31, 2002, pp. 116-120.
David Sigüenza Tortosa and Jari Nurmi, “Proteo: A New Approach to Network-on-Chip,” in Proc. International Conference on Communication Systems and Networks (CSN’02), Malaga, Spain, September 9-12, 2002, pp. 355-357.
Ilkka Saastamoinen, Mikko Alho and Jari Nurmi, “Buffer Implementation for Proteo Networks-on-Chip,” in Proc. International Symposium on Circuits and Systems ISCAS 2003, Bangkok, Thailand, May 25-28, 2003.
Jari Nurmi, Elena-Simona Lohan, Stephan Sand, and Heikki Hurskainen (Eds.), GALILEO Positioning Technology, Springer, 2014, ISBN 978-94-007-1829-6, Doi 10.1007/978-94-007-1830-2.
Waleed Bin Qaim, Aleksandr Ometov, Antonella Molinaro, Ilaria Lener, Claudia Campolo, Elena Simona Lohan, and Jari Nurmi, “Towards Energy Efficiency in the Internet of Wearable Things: A Systematic Review,” in IEEE Access, 2020, doi: 10.1109/ACCESS.2020.3025270.
David Sigüenza Tortosa, Tapani Ahonen and Jari Nurmi, “Issues in the Development of a Practical NoC: The Proteo Concept,” in Integration, The VLSI Journal, Elsevier, Vol. 38, pp. 95-105, October 2004.
Jari Nurmi, “Network-on-Chip: A New Paradigm for System-on-Chip Design,” invited paper in Proc. International Symposium on System-on-Chip SoC 2005, Tampere, Finland, November 15-17, 2005, pp. 2-6.
David Sigüenza Tortosa and Jari Nurmi, “VHDL-based Simulation Environment for Proteo NoC,” in Proc. Seventh Annual IEEE International Workshop on High Level Design Validation and Test (HLDVT’02), Cannes, France, October 27-29, 2002, pp. 1-6.
Omer Anjum, Tapani Ahonen, Fabio Garzia, Jari Nurmi, Claudio Brunelli, and Heikki Berg, “State of the Art Baseband DSP Platforms for Software Defined Radio: a Survey,” in EURASIP Journal on Wireless Communication and Networking, Hindawi, June 2011. doi:10.1186/1687-1499-2011-5.
Heikki Hurskainen, Elena Simona Lohan, Xuan Hu, Jussi Raasakka, and Jari Nurmi, “Multiple Gate Delay Tracking Structures for GNSS Signals and Their Evaluation with Simulink, SystemC and VHDL,” in International Journal of Navigation and Observation, Hindawi, vol. 2008, Article ID 785695, 17 pages, 2008. Doi:10.1155/2008/785695.
Francescantonio Della Rosa, Mauro Pelosi, and Jari Nurmi, "Human-Induced Effects on RSS Ranging Measurements for Cooperative Positioning," in International Journal of Navigation and Observation, vol. 2012, Article ID 959140, 13 pages, 2012. doi:10.1155/2012/959140.
Markku Renfors
- Emeritus Professor
- Faculty of Information Technology and Communication Sciences
- Tampere University
- +358408490752
- markku.renfors@tuni.fi
-
Please contact by email.
- https://orcid.org/0000-0003-1548-6851
About me
I am a professor in communications engineering, with emeritus status since the beginning of 2020.
My research area is signal processing in communication systems: waveforms, modulation methods, and flexible transmitter and receiver architectures based on advanced digital signal processing, considering also methods to mitigate RF imperfections. Recently I have focused on waveforms for beyond 5G systems with low peak-to-average power-ratio (PAPR) and excellent spectrum localization.
Research unit
Electrical Engineeting/Communication Engineering, Radio systems
Head of the Department of Communications Engineering, Tampere University of Technology, 1992-2010
Head of the TISE doctoral program, Tampere University of Technology, 2000-2013
IEEE Transactions on Signal Processing, Senior Area Editor, 2015-2018
IEEE Signal Processing Letters, Associate Editor, 2006-2010
Signal Processing (Elsevier), Member of Editorial Board, 2011-2019
Flexible fast-convolution processing for cellular radio evolution
Yli-Kaakinen, J., Levanen, T., Palin, A., Renfors, M. & Valkama, M., marrask. 2022, julkaisussa: IEEE Transactions on Communications. 70, 11, s. 7576-7590 15 SivumääräTutkimustuotos: Artikkeli › Scientific › vertaisarvioitu
Phase Noise Resilient Three-Level Continuous-Phase Modulation for DFT-Spread OFDM
Renfors, M., Peruga Nasarre, I., Levanen, T., Pajukoski, K. & Valkama, M., 2022, julkaisussa: IEEE Open Journal of the Communications Society. 3, s. 282-300Tutkimustuotos: Artikkeli › Scientific › vertaisarvioitu
基于不连续快速卷积的滤波处理
Yli-Kaakinen, J. (Keksijä), Levanen, T. (Keksijä), Renfors, M. (Keksijä), Pajukoski, K. (Keksijä) & Loulou, A. (Keksijä), 15 helmik. 2022, IPC-nro H04L27/26, Patenttinumero CN110661742B, Prioriteetin päiväys 29 kesäk. 2018, Prioriteettinumero FI20185602ATutkimustuotos: Patentti
多窗口快速卷积处理
Yli-Kaakinen, J. (Keksijä), Levanen, T. (Keksijä) & Renfors, M. (Keksijä), 7 tammik. 2022, IPC-nro H04L27/26, Patenttinumero CN110247871 (B), Prioriteetin päiväys 9 maalisk. 2018, Prioriteettinumero FI20185224ATutkimustuotos: Patentti
Effects of RF Imperfections on Interference Rejection Combining Based Black-Space Cognitive Radio
Srinivasan, S., Dikmese, S. & Renfors, M., huhtik. 2021, 2021 IEEE 93rd Vehicular Technology Conference, VTC 2021-Spring - Proceedings. IEEE, (IEEE Vehicular Technology Conference).Tutkimustuotos: Konferenssiartikkeli › Scientific › vertaisarvioitu
Efficiency analysis of a truncated flip-FBMC in burst optical transmission
Bahaaelden, M. S., Ortega, B., Perez-Jimenez, R. & Renfors, M., 2021, julkaisussa: IEEE Access. 9, s. 100558-100569 12 SivumääräTutkimustuotos: Artikkeli › Scientific › vertaisarvioitu
Frequency-Domain Signal Processing for Spectrally-Enhanced CP-OFDM Waveforms in 5G New Radio
Yli-Kaakinen, J., Loulou, A., Levanen, T., Pajukoski, K., Palin, A., Renfors, M. & Valkama, M., 2021, julkaisussa: IEEE Transactions on Wireless Communications. 20, 10, s. 6867-6883Tutkimustuotos: Artikkeli › Scientific › vertaisarvioitu
Mobile Communications beyond 52.6 GHz: Waveforms, Numerology, and Phase Noise Challenge
Levanen, T., Tervo, O., Pajukoski, K., Renfors, M. & Valkama, M., helmik. 2021, julkaisussa: IEEE Wireless Communications. 28, 1, s. 128-135 8 SivumääräTutkimustuotos: Artikkeli › Scientific › vertaisarvioitu
Multi-window fast convolution processing
Renfors, M. (Keksijä), Yli-Kaakinen, J. (Keksijä) & Levanen, T. (Keksijä), helmik. 2021, IPC-nro H04L 27/26, European Patent Office, Patenttinumero EP3537679B1 , 8 tammik. 2019, Prioriteetin päiväys 9 maalisk. 2018, Prioriteettinumero FI20185224ATutkimustuotos: Patentti
Novel filter bank-based cooperative spectrum sensing under practical challenges for beyond 5G cognitive radios
Dikmese, S., Lamichhane, K. & Renfors, M., 15 helmik. 2021, julkaisussa: Eurasip Journal on Wireless Communications and Networking. 2021, 30.Tutkimustuotos: Artikkeli › Scientific › vertaisarvioitu
Vishnu Unnikrishnan
- Assistant Professor
- mikroelectronics
- Faculty of Information Technology and Communication Sciences
- Tampere University
- +358505973906
- vishnu.unnikrishnan@tuni.fi
Field of expertise
Microelectronics, analog/RF/mixed-signal circuits, digital integrated circuits, data conversion, nanometer-scale CMOS, signal processing
Research topics
My research is broadly on developing architectures, circuit techniques and signal processing concepts towards energy-efficient high-performance analog/digital/RF/mixed-signal integrated circuits and systems in nanometer-scale CMOS nodes. A dominant theme is to explore the possibility of building analog/mixed-signal circuits with digital/switch components by utilizing time-based parameters of pulse waveform for representation of analog information, thus improving the scaling-friendliness and cross-technology portability of analog interfaces. Starting from behavioral modeling of systems and communication links along with underlying nonidealities, we develop new system architectures and circuit techniques to push the performance boundary, and validate them in Silicon by designing and characterizing prototype chips in nanometer-scale CMOS technologies. Application areas of interest include 5G-Advanced/6G wireless transceivers, high-speed serial links and wireline transceivers, biomedical electronics etc. The group works in close collaboration with the SoC Hub, an ecosystem created Tampere University and a consortium of local businesses to boost research and education in the area of system-on-chip design, thus achieving synergy with industrial interests.
Applications are invited from highly motivated and talented individuals towards doctoral studies and postdoctoral research (salaried positions), throughout the year. Paid master thesis work and summer jobs are also available in the area of IC design and signal processing. Please contact for more information.
Research fields
Active research areas/projects include the following, but are not limited to those.
- Time-Based Data Conversion Circuits (VCO-based ADCs, time-based ADCs, TDCs, time-interleaved ADCs)
- High-Speed Serial Links (SerDes, wireline transceivers, waveform design)
- Wireless Transceiver Circuits for 5G/6G (Wideband receivers, beamforming, wideband transmitters)
- Digital-assistance for analog interfaces (Linearization of ADCs, linearization of PAs, compensation of mismatch errors and layout effects in transceiver circuits)
- Efficient implementation of digital circuits like filters and arithmetic circuits towards high-speed and low-power operation
Research career
Funding:
- EU Marie Curie ITN (SMArT, 860921): 818 kEUR
- Academy of Finland Project Funding (2021, 351235): 821 kEUR
- A. Ghosh, A. Spelman, T. H. Cheung, D. Boopathy, K. Stadius, M. D. Gomony, M. Valkama, J. Ryynänen, M. Kosunen, V. Unnikrishnan, "Reconfigurable Signal Processing and DSP Hardware Generator for 5G and Beyond Transmitters," in IEEE Transactions on Very Large Scale Integration (VLSI) Systems, vol. 32, no. 1, pp. 4-15, Jan. 2024, doi: 10.1109/TVLSI.2023.3326159.
- A. Fischer-Bühner, A. Brihuega, L. Anttila, M. Turunen, V. Unnikrishnan, M. D. Gomony, M. Valkama, "Sparsely Gated Mixture of Experts Neural Network For Linearization of RF Power Amplifiers," in IEEE Transactions on Microwave Theory and Techniques, 2023, doi: 10.1109/TMTT.2023.3341616.
- V. Lampu, G. Xu, A. Brihuega, M. Kosunen, V. Unnikrishnan, J. Ryynänen, C. Fager, M. Valkama, "Multilevel Outphasing With Over-the-Air Combining in Large Antenna Arrays," in IEEE Transactions on Communications, vol. 71, no. 12, pp. 7347-7362, Dec. 2023, doi: 10.1109/TCOMM.2023.3312683.
- K. Spoof, M. Tenhunen, V. Unnikrishnan, K. Stadius, M. Kosunen and J. Ryynänen, "True-Time-Delay Receiver IC With Reconfigurable Analog and Digital Beamforming," in IEEE Access, vol. 10, pp. 116375-116383, 2022, doi: 10.1109/ACCESS.2022.3219938.
- O. Järvinen et al., "Energy-Efficient Cyclic-Coupled Ring Oscillator With Delay-Based Injection Locking," in IEEE Transactions on Circuits and Systems II: Express Briefs, vol. 69, no. 9, pp. 3709-3713, Sept. 2022, doi: 10.1109/TCSII.2022.3176805.
- O. Järvinen, I. Kempi, V. Unnikrishnan, K. Stadius, M. Kosunen and J. Ryynänen, "Fully Digital On-Chip Wideband Background Calibration for Channel Mismatches in Time-Interleaved Time-Based ADCs," in IEEE Solid-State Circuits Letters, vol. 5, pp. 9-12, 2022, doi: 10.1109/LSSC.2022.3145918.
- O. Järvinen, V. Unnikrishnan, W. Siddiqui, T. Korhonen, K. Koli, K. Stadius, M. Kosunen, J. Ryynänen, "A 100–750 MS/s 11-Bit Time-to-Digital Converter With Cyclic-Coupled Ring Oscillator," in IEEE Access, vol. 9, pp. 48147-48156, 2021, doi: 10.1109/ACCESS.2021.3068838.
- V. Unnikrishnan, O. Järvinen, W. Siddiqui, K. Stadius, M. Kosunen and J. Ryynänen, "Data Conversion With Subgate-Delay Time Resolution Using Cyclic-Coupled Ring Oscillators," in IEEE Transactions on Very Large Scale Integration (VLSI) Systems, vol. 29, no. 1, pp. 203-214, Jan. 2021, doi: 10.1109/TVLSI.2020.3031028.
- K. Spoof, M. Zahra, V. Unnikrishnan, K. Stadius, M. Kosunen and J. Ryynänen, "A 0.6–4.0 GHz RF-Resampling Beamforming Receiver With Frequency-Scaling True-Time-Delays up to Three Carrier Cycles," in IEEE Solid-State Circuits Letters, vol. 3, pp. 234-237, 2020, doi: 10.1109/LSSC.2020.3012654.
- K. Spoof, V. Unnikrishnan, M. Zahra, K. Stadius, M. Kosunen and J. Ryynänen, "True-Time-Delay Beamforming Receiver With RF Re-Sampling," in IEEE Transactions on Circuits and Systems I: Regular Papers, vol. 67, no. 12, pp. 4457-4469, Dec. 2020, doi: 10.1109/TCSI.2020.3005475.
- O. Olabode, M. Kosunen, V. Unnikrishnan, T. Palomäki, T. Laurila; K. Halonen, J. Ryynänen, "Time-Based Sensor Interface for Dopamine Detection," in IEEE Transactions on Circuits and Systems I: Regular Papers, vol. 67, no. 10, pp. 3284-3296, Oct. 2020, doi: 10.1109/TCSI.2020.3008363.
- V. Unnikrishnan and M. Vesterbacka, "Mitigation of Sampling Errors in VCO-Based ADCs," in IEEE Transactions on Circuits and Systems I: Regular Papers, vol. 64, no. 7, pp. 1730-1739, July 2017, doi: 10.1109/TCSI.2017.2670058.
- V. Unnikrishnan and M. Vesterbacka, "Time-Mode Analog-to-Digital Conversion Using Standard Cells," in IEEE Transactions on Circuits and Systems I: Regular Papers, vol. 61, no. 12, pp. 3348-3357, Dec. 2014, doi: 10.1109/TCSI.2014.2340551.
Bo Tan
- Associate Professor
- wireless communications
- Faculty of Information Technology and Communication Sciences
- Tampere University
- +358504771867
- bo.tan@tuni.fi
Research unit
Electrical Engineering
Mikko Valkama
- Professor
- Communications Engineering
- Faculty of Information Technology and Communication Sciences
- Tampere University
- +358408490756
- mikko.valkama@tuni.fi
Senior Staff
Markus Allén
- University Lecturer
- Communications Engineering
- Faculty of Information Technology and Communication Sciences
- Tampere University
- +358503227014
- markus.allen@tuni.fi
Cellular Digital Post-Distortion: Signal Processing Methods and RF Measurements
Babaroglu, H., Anttila, L., Xu, G., Turunen, M., Allén, M. & Valkama, M., 2023, 2023 IEEE Wireless and Microwave Technology Conference, WAMICON 2023. IEEE, s. 25-28 4 SivumääräTutkimustuotos: Konferenssiartikkeli › Scientific › vertaisarvioitu
Parallel Delta-Sigma Modulator-Based Digital Predistortion of Wideband RF Power Amplifiers
Othmani, M., Boulejfen, N., Turunen, M., Allen, M., Ghannouchi, F. M. & Valkama, M., helmik. 2023, julkaisussa: IEEE Transactions on Circuits and Systems I: Regular Papers. 70, 2, s. 705-718 14 SivumääräTutkimustuotos: Artikkeli › Scientific › vertaisarvioitu
Delta-Sigma Modulator-Embedded Digital Predistortion for 5G Transmitter Linearization
Othmani, M., Boulejfen, N., Brihuega, A., Ghannouchi, F. M., Allen, M. & Valkama, M., elok. 2022, julkaisussa: IEEE Transactions on Communications. 70, 8, s. 5558-5571 14 SivumääräTutkimustuotos: Artikkeli › Scientific › vertaisarvioitu
Inverse Covariance Matrix Estimation for Low-Complexity Closed-Loop DPD Systems: Methods and Performance
Pascual Campo, P., Anttila, L., Lampu, V., Allen, M., Guo, Y., Wang, N. & Valkama, M., 2022, julkaisussa: IEEE Transactions on Microwave Theory and Techniques. 70, 3, s. 1474-1489 16 SivumääräTutkimustuotos: Artikkeli › Scientific › vertaisarvioitu
Near-ground propagation in automotive radar and communication obstructed deployments: Measurements and modelling
Solomitckii, D., Semkin, V., Turunen, M., Allén, M. & Valkama, M., 2022, julkaisussa: IET Microwaves, Antennas and Propagation. 16, 6, s. 316-326Tutkimustuotos: Artikkeli › Scientific › vertaisarvioitu
Closed-Loop Sign Algorithms for Low-Complexity Digital Predistortion: Methods and Performance
Campo, P. P., Lampu, V., Anttila, L., Brihuega, A., Allen, M., Guo, Y. & Valkama, M., 2021, julkaisussa: IEEE Transactions on Microwave Theory and Techniques. 69, 1, s. 1048-1062 15 SivumääräTutkimustuotos: Artikkeli › Scientific › vertaisarvioitu
Millimeter-Wave Radar Scheme with Passive Reflector for Uncontrolled Blind Urban Intersection
Solomitckii, D., Baquero Barneto, C., Turunen, M., Allen, M., Zhabko, G., Zavjalov, S., Volvenko, S. & Valkama, M., 2021, julkaisussa: IEEE Transactions on Vehicular Technology. 70, 8, s. 7335-7346 12 SivumääräTutkimustuotos: Artikkeli › Scientific › vertaisarvioitu
Near-Ground Propagation Measurements for Vehicular Deployments
Solomitckii, D., Semkin, V., Turunen, M., Allen, M., Oestges, C. & Valkama, M., 2021, 15th European Conference on Antennas and Propagation, EuCAP 2021. IEEE, 5 Sivumäärä (15th European Conference on Antennas and Propagation, EuCAP 2021).Tutkimustuotos: Konferenssiartikkeli › Scientific › vertaisarvioitu
Waveforms and End-to-End Efficiency in RF Wireless Power Transfer Using Digital Radio Transmitter
Ayir, N., Riihonen, T., Allen, M. & Fierro, M. F. T., 2021, julkaisussa: IEEE Transactions on Microwave Theory and Techniques. 69, 3, s. 1917-1931 15 SivumääräTutkimustuotos: Artikkeli › Scientific › vertaisarvioitu
Closed-loop sign algorithms for low-complexity digital predistortion
Campo, P. P., Lampu, V., Anttila, L., Brihuega, A., Allen, M. & Valkama, M., elok. 2020, IMS 2020 - 2020 IEEE/MTT-S International Microwave Symposium. IEEE, s. 841-844 4 Sivumäärä (IEEE MTT-S International Microwave Symposium Digest; Vuosikerta 2020-August).Tutkimustuotos: Konferenssiartikkeli › Scientific › vertaisarvioitu
Toni Björninen
- University Lecturer
- mikroaaltotekniikka
- Faculty of Information Technology and Communication Sciences
- Tampere University
- +358408490096
- toni.bjorninen@tuni.fi
Jari Kangas
- University Lecturer
- sovellettu elektroniikka
- Faculty of Information Technology and Communication Sciences
- Tampere University
- +358503003471
- jari.kangas@tuni.fi
Dmitri Moltchanov
- University Lecturer
- Faculty of Information Technology and Communication Sciences
- Tampere University
- +358401981912
- dmitri.moltchanov@tuni.fi
Joonas Säe
- Staff Scientist
- tutkimusympäristöasiantuntija
- Faculty of Information Technology and Communication Sciences
- Tampere University
- +358503231108
- joonas.sae@tuni.fi
About me
I am working as a staff scientist at the faculty of Information Technology and Communication Sciences, at Tampere University, in close collaboration with the Electrical Engineering Unit in the field of Communications Engineering and Radio Systems. Also, I am one of the responsible persons related to drone operations at Tampere University.
Wireless communications infrastructure: RF lab (TC407b), 4G/5G mobile networks, LoRAWAN IoT network, and wireless mesh network around Hervanta campus.
Responsibilities
I am responsible for the wireless communications research infrastructure located at the Hervanta campus. I also study the corresponding research field.
In addition, my responsibilities include, but are not limited to: teaching, MSc supervision, responsible person of EE webpages, networking and research services for industry and research organizations. Supporting research application preparations related to the use of wireless infrastructures.
Research topics
5G, B5G, 6G networks, UAV and UAS, IoT technologies.
Research unit
Electrical Engineering
Reliable and Low-Latency Communications for Critical Infrastructures Utilizing Wireless Mesh Networks
Biswas, R., Säe, J., Pirskanen, J. & Lempiäinen, J., 2024, 2024 International Conference on Computing, Networking and Communications, ICNC 2024. IEEETutkimustuotos: Konferenssiartikkeli › Scientific › vertaisarvioitu
Tracking the Occluded Indoor Target with Scattered Millimeter Wave Signal
Xu, Y., Wang, X., Kupiainen, J., Sae, J., Boutellier, J., Nurmi, J. & Tan, B., 2024, (E-pub ahead of print) julkaisussa: IEEE Sensors Journal.Tutkimustuotos: Artikkeli › Scientific › vertaisarvioitu
Optimized UAV-Based Connectivity Solutions for Urban IoT Networks
Kirubakaran, B., Younesian, E., Säe, J. & Hosek, J., 30 lokak. 2023, 2023 15th International Congress on Ultra Modern Telecommunications and Control Systems and Workshops (ICUMT). IEEE, (International Conference on Ultra Modern Telecommunications & workshops).Tutkimustuotos: Konferenssiartikkeli › Scientific › vertaisarvioitu
Agile 5G Network Measurements: Operator Benefits of Employing Aerial Mobility
Säe, J., Kurvi, P., Andreev, S. & Valkama, M., kesäk. 2022, julkaisussa: IEEE Internet of Things Magazine. 5, 2, s. 114-119 6 SivumääräTutkimustuotos: Artikkeli › Scientific › vertaisarvioitu
DECT-2020 New Radio: The Next Step toward 5G Massive Machine-Type Communications
Kovalchukov, R., Moltchanov, D., Pirskanen, J., Säe, J., Numminen, J., Koucheryavy, Y. & Valkama, M., 17 kesäk. 2022, julkaisussa: IEEE Communications Magazine. 60, 6, s. 58-64 7 SivumääräTutkimustuotos: Artikkeli › Scientific › vertaisarvioitu
Evaluation of Maximum Range for Backscattering Communications Utilising Ambient FM radio signals
Biswas, R., Säe, J. & Lempiäinen, J., 2022, 2022 International Balkan Conference on Communications and Networking, BalkanCom 2022. IEEE, s. 142-146 5 SivumääräTutkimustuotos: Konferenssiartikkeli › Scientific › vertaisarvioitu
Maximum Receiver Harvesting Area of Backscatter Signals from Ambient Low-Frequency Mobile Networks
Biswas, R., Säe, J. & Lempiäinen, J., 2021, 2021 IEEE Global Communications Conference (GLOBECOM). IEEE, 5 Sivumäärä 9685741. (IEEE Global Communications Conference).Tutkimustuotos: Konferenssiartikkeli › Scientific › vertaisarvioitu
Reliability of UAV Connectivity in Dual-MNO Networks: A Performance Measurement Campaign
Säe, J., Wirén, R., Kauppi, J., Torsner, J., Andreev, S. & Valkama, M., kesäk. 2020, 2020 IEEE International Conference on Communications Workshops (ICC Workshops). IEEE, 5 SivumääräTutkimustuotos: Konferenssiartikkeli › Scientific › vertaisarvioitu
Using 5G to bring more than just bits to homes
Tan, B., Cosmas, J., Banitsas, K., Rustell, M., Sae, J., Valkama, M., Zhang, Y., Oca, E. M. D. & Aondoakaa, D., 27 lokak. 2020, 2020 IEEE International Symposium on Broadband Multimedia Systems and Broadcasting, BMSB 2020. IEEE, 8 Sivumäärä 9379767. (IEEE International Symposium on Broadband Multimedia Systems and Broadcasting, BMSB; Vuosikerta 2020-October).Tutkimustuotos: Konferenssiartikkeli › Scientific › vertaisarvioitu
Distribution Network Maintenance Work Enhancement With Drones During Limited Mobile Network Access
Säe, J., Laaja, J., Paananen, H. & Valkama, M., kesäk. 2019, 25th International Conference on Electricity Distribution. CIRED, (CIRED conference proceedings).Tutkimustuotos: Konferenssiartikkeli › Scientific › vertaisarvioitu
Jukka Talvitie
- University Lecturer
- Faculty of Information Technology and Communication Sciences
- Tampere University
- jukka.talvitie@tuni.fi
Juha Vihervaara
- Lecturer
- tietoliikenne
- Faculty of Information Technology and Communication Sciences
- Tampere University
- +358408262830
- juha.vihervaara@tuni.fi
Lauri Anttila
- Senior Research Fellow
- Faculty of Information Technology and Communication Sciences
- Tampere University
- lauri.anttila@tuni.fi
Mikko Heino
- Postdoctoral Research Fellow
- Faculty of Information Technology and Communication Sciences
- Tampere University
- mikko.heino@tuni.fi
Ossi Kaltiokallio
- Senior Research Fellow
- Faculty of Information Technology and Communication Sciences
- Tampere University
- +358407423705
- ossi.kaltiokallio@tuni.fi
Dmitrii Solomitckii
- Postdoctoral Research Fellow
- Faculty of Information Technology and Communication Sciences
- Tampere University
- dmitrii.solomitckii@tuni.fi
RF Laboratory Support
Matias Turunen
- Specialist
- Faculty of Information Technology and Communication Sciences
- Tampere University
- matias.turunen@tuni.fi