ACG 150


The Smart Wireless Future Technologies (SWiFT) Lab hosts both theoretical and experimental work aimed at advancing state-of-the-art wireless technology and showcasing corresponding findings. The involved research areas include: communication system design; signal processing and machine learning techniques; constrained optimization; communication theory; adaptive filtering; wireless channel modelling and estimation; spectrum sensing and sharing; positioning techniques; interference management; cooperative communications; resource allocation; cross-layer optimization; wireless relaying and intelligent reflective surfaces; wireless access and backhauling; heterogeneous networks; hybrid terrestrial / satellite networks; multi-antenna and massive MIMO systems; cloud-RAN, cell-free MIMO; antenna design; hybrid analog / digital antenna arrays; cm and mmWave systems; net-zero energy networks and non-terrestrial networks, wireless network security and policy reinforcement, among others. A number of emerging research areas such as battery-less / passive RFID technology, simultaneous wireless information and power transfer, Terahertz wireless, visible light communication and quantum-enabled wireless transmission are also within scope. The theoretical work performed in the above areas is accompanied by a number of lab-grade prototypes and systems, over-the-air trials and measurement campaigns, based on an extensive hardware, software and instrumentation infrastructure that keeps being renewed in order to keep up with the experimental demands of novel systems and concepts.


Technology and application domains

The targeted technology domains range from body area networks and the Internet-of-Things (IoT) to next (6G) generation mobile broadband and satellite networks to smart power grids and net-zero energy networking to technologies for human-computer interaction. These include current and future (5G and beyond) mobile networks, personal and local area / WiFi networks, fixed wireless networks, wireless sensor networks, satellite networks, the Internet-of-Things, wireless system components such as antenna modules and power-autonomous sensors, handsets, access points and base stations, among others. These technologies may benefit a large number of related industries, sectors and processes, such as the automotive industry and other transportation sectors, including aviation; the energy sector (smart energy networks / smart grid); the security and safety sector, including surveillance, emergency and first responder systems; the manufacturing sector; the municipal sector (e.g., smart cities); the medical industry; the agricultural sector, the space sector, the government sector (e.g., spectrum regulation, environmental monitoring); e-commerce; e-banking; social media; video-conferencing; content streaming and sharing platforms, etc. Some examples of intended and envisioned applications include location-aware spectrum management and services, smart manufacturing, intelligent transportation networks, energy-autonomous and non-terrestrial networks, wireless-based network security, biomedical systems and quantum-based wireless security.


Experience and visibility

The SWiFT Lab hosts research in a number of fields within its thematic range, but also branching out to related areas such as biomedical signal processing and UAV systems. Through its researchers, members and collaborators, the SWiFT lab maintains a proven track record of success in cutting edge, theoretical and applied research as well as technology innovation. Its success is demonstrated by the corresponding publications, graduate students’ supervision, patent applications, funded research projects, industrial collaborations, participation in relevant think-tanks, technical / scientific committees, standardization activities and technology expert and leadership positions. We pursue high calibre scientific publications, proof-of-concept prototypes, as well as regulatory and standardization activities. As a part of ACG’s RTIN, the SWiFT Lab also continuously explores innovation opportunities related to its research findings, including the generated intellectual property in collaboration with ACG’s Tech Transfer Office, taking advantage of RTIN’s technology transfer expertise as well as utilizing its network of partners, collaborators, donors and investors.


Facilities and Lab infrastructure

The SWiFT Lab benefits from state-of-the-art wireless research premises, as well as offices and meeting spaces for its members, collaborators and visitors, hosted on the main campus of The American College of Greece in Aghia Paraskevi in Athens, Greece. The Lab is an integral part of the campus, enjoying access to all the campus services and facilities (e.g., libraries, teaching auditoriums, science labs, meeting rooms, administrative services, etc.) and benefiting from interactions with the faculty, students and researchers of all ACG’s schools, institutes and centers, as well as facilities in the other locales of ACG.

Inspired by both the Silicon Valley technology innovation paradigm and the MIT Media Lab’s “Demo or Die” motto, ACG’s SWiFT Lab equally values the development of theoretical breakthroughs of high potential impact and their experimental demonstration. To this end, it offers one of south-east Europe’s most advanced wireless research infrastructures, including hardware and software testbeds, prototypes, measurement equipment and fabrication tools. As technology evolves, the Lab continually seeks new research/industrial grants and sponsorship/donations in order to keep expanding its know-how and infrastructure and remain at the cutting-edge of wireless research.

If you would like to read our brochure, please click here.


To perform and demonstrate frontier research leading to intelligent wireless concepts, techniques and systems that can impact the shaping and usage of future networks, technologies and applications benefiting from wireless technology.


To become Southeast Europe’s prime hub for research & innovation related to wireless technologies.


Constantinos B. Papadias, PhD
Head, SWiFT Lab

SWiFT Lab Members

George Vardoulias, PhD
Defense Networks & Cybersecurity
Muhammad Haroon Tariq
ALBA Researcher, hosted at RTIN’s Smart Wireless Future Technologies (SWIFT) Lab
Panagiotis Sideridis
Work-study intern
Iason Grivas
Work-study intern
Sevastianos Kouridakis
Research Assistant

SWiFT Lab Alumni

Dr. Nithin Babu
Kimon Karathanasopoulos
Research Assistant (Work Study)
Bazhen Kochnev
Research Assistant (Work Study)
Nikolaos Ntetsikas

Lab Infrastucture

mmWave Channel Sounders

Broadband Massive MIMO (5G+) channel sounder
Directional channel sounder

Software-defined Radio Platforms

National Instruments NI USRP-2932
National Instruments NI USRP-2953R
National Instruments USRP B210
HackRF One

IoT platforms

Rapsberry Pi’s

Measurement & Testing equipment

Digital oscilloscopes / Signal Generators
Analog circuit design Breadboards
Network Analyzer
Digital Microscope DM4

Fabrication/Prototyping equipment

Laser Cutter
3D Printer



UAV-mounted portable access point (PAP)

Antenna prototypes

Hybrid Multi-Active / Multi-Passive Antenna Array
Printed patch antenna arrays
Printed Yagi antenna arrays
Printed mmWave antenna arrays

Software platforms

Channel modelling software tool
Electromagnetic simulation software

N/W simulation tools

National Instruments LabView


Besides its individual team members’ participation in various scientific and professional societies and the team participation in collaborative research consortia, the SWiFT Lab also participates in fora such as:

Telecom Infra Project Alliance

The Telecom Infra Project Alliance, where it represents ACG as a Member Organization.

Green Information and Communication Technologies (GREEN TIC) consortium

The Green Information and Communication Technologies (GREEN TIC) consortium where Dr. Papadias participates in the Scientific Council.

Research Projects & Industrial Collaborations

The SWiFT Lab’s members and collaborators participate actively in EU-funded research projects, with significant presence in the European Commission’s framework programs over the last 20 years (ranging from FP5 to Horizon Europe). The corresponding projects have been in various areas in Information & Communication Technologies (ICT), but also in Health and Space. They include also projects under the Future Emerging Technologies (FET-Open) program, as well as Marie Skłodowska-Curie actions (Innovative Training Networks – ITN)


Energy-autonomous portable access points for infrastructure-less networks
PAINLESS is a recently-completed multi-partner European Training Network (ETN) project within the framework of the H2020 Marie Skłodowska-Curie Innovative Training Networks (ITNs) of the Horizon 2020 Program of the European Commission, with a total budget of 4M€. PAINLESS was launched in 2018 with the visionary aim to establish a training and research platform to pioneer green, energy-autonomous portable network nodes that are self-subsistent and limitlessly-scalable, to satisfy future demands with minimal infrastructure. PAINLESS relates to the H2020-MSCA (Marie Skłodowska-Curie Actions) with a vision to produce the first generation of experts in a radically new wave of energy autonomous networks that will revolutionize the wireless networking technology landscape and the plethora of associated vertical business sectors (see Figure 6). Dr. Papadias is the project’s Research Coordinator and the SWiFT Lab has hosted Dr. Nithin Babu, Muhammad Haroon Tariq and David Chatzichristodoulou (short-term) as early-stage researchers (ESRs).


Framework for the Identification of Rare Events via Machine learning & IoT Networks

FIREMAN is an EU-CHIST-ERA project on the topic of Big data and process modelling for smart industry (BDSI) with a budget exceeding 1M€. It proposes an Internet of Things (IoT)-based industrial cyber-physical system (CPS) and works in three generic steps, as shown in Figure 7: 1) Large data acquisition / dissemination: a physical process is monitored by sensors that pre-process the (assumed large) collected data and send the processed information to an intelligent node (e.g., aggregator, central controller); 2) Big data fusion: The intelligent node uses artificial intelligence (e.g., machine learning, data clustering, pattern recognition, neural networks) to convert the received (“big”) data to useful information to guide short-term operational decisions related to the physical process; 3) Big data analytics: The physical process together with the acquisition and fusion steps can be virtualized, building then a cyber-physical process, whose dynamic performance can be analysed and optimized through visualization (if human intervention is available) or artificial intelligence (if the decisions are automatic) or a combination thereof.

In doing so, FIREMAN uses the Internet of Things to create a new structure of awareness – a cybernetic one – upon physical processes. Industries of different kinds are expected to benefit from this revolution, leading to Factories of the Future within the context of the so-called “Industry 4.0”. Dr. Papadias is the project’s Technical Coordinator and Dr. Ioannis Christou is a Lead Technical Contributor.

Collaboration with Nokia Bell Labs US on 60 GHz Wireless Propagation Measurements

In this collaboration with Nokia Bell Labs US, a team of researchers from RTIN’s Smart Wireless Future Technologies (SWiFT) Lab performed a measurement campaign of wireless channels on ACG’s main campus in Aghia Paraskevi. The project took place from March 2021 to Sept. 2021, during which time the ACG team performed a number of measurements of 60 GHz wireless channels, under the guidance of the Nokia Bell Labs team in New Jersey. The purpose of this measurement campaign was to characterize next-generation fixed broadband wireless channels in terms of parameters such as path loss, angular spread, gain degradation, and temporal variations in received power. The campaign included several parts of the campus such as the Communications building, the Deree courtyards, the Fine Arts building, the Admissions & Marketing offices & courtyard, the Faculty lounge, the Pierce Arts Studios, the open-air parking lot, etc. The campaign was successfully completed with a final report and a related publication is under preparation.

Collaboration with Spirit Aeronautical Systems (S.A.S) on UAV-based Wireless Access

This ongoing project is done collaboratively with Spirit Aeronautical Systems, a local technology company that specializes in unmanned systems technology. The collaboration started in June 2021 and aims at the study and development of UAV-borne wireless access systems. The first phase of the project, which is underway, comprises a number of test flights in order to validate and possibly expand our models on the power consumption of the Unmanned Aerial Vehicle – UAV (drone) for a variety of flying conditions, heights and speed, as well as for the optimization of these parameters in terms of energy autonomy. The second phase, which is currently being planned, will target the integration of a wireless access point on a drone provided by S.A.S, in order to demonstrate its capabilities in real-world environments for UAV-assisted wireless connectivity. This work is also related to the theoretical studies our team has made in the context of the European (ITN) Project PAINLESS. A live demo of the developed prototype is planned for late spring of 2022.

EU Marie Skłodowska-Curie project ComRad

Combining MIMO Radar with MU-MIMO Communications: More than Coexistence

ComRad is a H2020 Marie Skłodowska-Curie Actions – Individual Fellowship (MSCA-IF) project (grant #: 793345) awarded to Dr. Fan Liu of University College London (UCL), under the primary supervision of UCL Professor Dr. C. Masouros. The two-year project was launched in Nov. 2018, with the aim of developing novel signal processing techniques for transmit and receive beamforming, waveform design, signal classification/recognition and channel estimation in order to enable the exploitation of radar spectrum for communication applications with a particular focus on 1) coexisting communication and radar systems (C-ComRad), and 2) Dual-functional Communication-Radar Systems (D-ComRad) – see Figure 8. Dr. Papadias participates in the project as an external participant/co-supervisor. For more info, click here.

Academy of Finland project ee-IoT

Energy-Efficient IoT Deployment for Systems of the Future

ee-IoT is a three-year research project funded by the Academy of Finland (grant #319008 under program ICT-2023) that started in Oct. 2018. Its main objective is to develop an energy-efficient machine-type communication (MTC) deployment for diverse Internet-of-Things (IoT) applications and their specific requirements (see Figure above). To achieve this, it studies the communication deployment as a transparent part of a Cyber-Physical System. In other words, the path from the sensed physical process to the end application is a black box that must achieve a pre-determined performance. The proposed energy-efficient IoT solution includes:
• Differential treatment of different applications
• Pre-processing at the edge based on the specific application / traffic requirements
• Characterization of distinct traffic regimes
• Joint design of the wireless communication system with data aggregation and pre-processing

Dr. Papadias participates in the project as “International Collaborator,” participating in student co-supervision and joint research activities in the area of energy-efficient wireless access techniques

European Space Agency Project SatNEx V

SatNEx V Satellite Network of Experts V

SatNEx V is a project funded by the European Space Agency (ESA) within the framework of its Technology Development Program. The project is coordinated by the Centre Tecnològic de les Telecomunicacions de Catalunya (CTTC) Research Center in Spain (Prof. A. I. Pérez-Neira) and its objective is to study medium/long term directions of Space and Satellite Telecommunication Systems for any of the Commercial or Institutional
applications that can be considered appealing to key players in the space technologies domain but that are still not mature enough for attracting industry or initiating dedicated ESA R&D activities.
The SatNEx technical R&D activities will be based on a periodic definition / update of R&D directions and review of interim results which will involve independent experts and industrial partners belonging to ESA Member States that will be invited to the SatNEx Advisory board.
SatNEx V will support the collaboration and exchange of personnel among SatNEx member partners as well as research visits to ESA/ESTEC according to the R&D needs.

ACG is a partner of SatNEx V, represented by Dr. Papadias. The project was formally launched on June 26, 2020 and will last for 4 years.


The SWiFT Lab works with a large pool of external collaborators on a number of joint projects and publications, exchanging visitors, sharing infrastructure, etc. These include academic institutions like University College London, Aalborg University, the University of Cyprus, the University of Edinburgh, Trinity College Dublin, Stanford University, New York University, Princeton University, Telecom Paris Tech, KTH, University of Oulu, Lappeenranta-Lahti University of Technology, Technische Universitat Darmstadt, Friedrich-Alexander-Universität Erlangen-Nürnberg, Technische Universität Wien, Universitat Pompeu Fabra, University Carlos III of Madrid, University Hassan II in Casablanca. It also collaborated with research institutes, such as National Center for Scientific Research “Demokritos,” Athena Research Center, Eurecom Institute, Centre Tecnològic de Telecomunicacions de Catalunya (CTTC), among others.

On the industrial front, the SWiFT Lab collaborates with Nokia, Samsung, Huawei, Ericsson, Intel, National Instruments, Orange, Cosmote, OTE, and Intracom Telecom, Intracom Defense and more. On the front of innovation, the Lab collaborates closely with the startup ecosystem and VC communities in Greece and Cyprus.

Recent Publications


Spectrum Sharing: The Next Frontier in Wireless Networks, C. B. Papadias, T. Ratnarajah and D. Slock (Editors.), ISBN: 978-1-119-55151-5, Wiley-IEEE Press, April 2020.

Book Chapters

[1] C. B. Papadias, T. Ratnarajah, D. Slock, “Introduction: from cognitive radio to spectrum sharing on packet basis,” in Spectrum Sharing: The Next Frontier in Wireless Networks, C. B. Papadias, T. Ratnarajah, D. Slock, Eds., Wiley-IEEE Press, 2020.

[2] C. B. Papadias, K. Ntougias, G. Papageorgiou, “The role of antenna arrays in spectrum sharing,” in Spectrum Sharing: The Next Frontier in Wireless Networks, C. B. Papadias, T. Ratnarajah, D. Slock, Eds., Wiley-IEEE Press, 2020.

Journal papers (Appeared/Accepted)

[1] A. S. de Sena, D. B. da Costa, Z. Ding, P. H. J. Nardelli, U. S. Dias and C. B. Papadias, “Massive MIMO-NOMA networks with successive sub-array activation,” IEEE Transactions on Wireless Communications, vol. 19, no. 3, pp. 1622-1635, March 2020.

[2] G. K. Papageorgiou, M. Sellathurai, K. Ntougias and C. B. Papadias, “A stochastic optimization approach to hybrid processing in massive MIMO systems,” IEEE Wireless Communications Letters, vol. 9, No. 6, pp. 770-773, June 2020.

[3] A. S. de Sena, F. Rafael M. Lima, Daniel B. da Costa, Z. Ding, P. H. J. Nardelli, U. S. Dias, C. B. Papadias, “Massive MIMO-NOMA networks with imperfect SIC: design and fairness enhancement,” IEEE Transactions on Wireless Communications, to appear, 2020 (available via early access June 11, 2020).

[4] O. A. Lopez, S. M. Sánchez, R. Demo, C. B. Papadias, H. Alves, “On CSI-free multi-antenna schemes for massive wireless energy transfer,” IEEE Internet of Things Journal, to appear, 2020 (available via early access, June 17, 2020).

[5] G. K. Papageorgiou, K. Voulgaris, K. Ntougias, D. K. Ntaikos, M. M. Butt, C. Galiotto, N. Marchetti, V. Frascolla, H. Annouar, A. Gomes, A. J. Morgado, M. Pesavento, T. Ratnarajah, K. Gopala, F. Kaltenberger, D. T. M. Slock, F. Khan and C. B. Papadias, “Advanced dynamic spectrum 5G mobile networks employing licensed shared access,” IEEE Communications Magazine, vol. 58, No. 7, pp. 21-27, July 2020.

[6] K. Ntougias, C. B. Papadias, G. K. Papageorgiou, G. Hasslinger, T. B. Sorensen, “Coordinated caching and QoS-aware resource allocation for spectrum sharing,” Wireless Personal Communications, to appear, 2020 (available online since March 26, 2020).

[7] A. S. de Sena, D. Carillo, F. Fang, P. H. J. Nardelli, D. B. da Costa, U. S. Dias, Z. Ding, C. B. Papadias, and W. Saad, “What role do intelligent reflecting surfaces play in multi-antenna non-orthogonal multiple access?” IEEE Wireless Communications Magazine, to appear, 2020.

[8] N. Babu, C. B. Papadias, and P. Popovski, “Energy-efficient 3D deployment of aerial access points in a UAV communication system,” IEEE Communication Letters.

[9] M. Haroon Tariq, D. K. Ntaikos, and C. B. Papadias, “Design guidelines for multi-active / multi-passive parasitic antenna arrays,” IEEE Antennas and Wireless Propagation Letters, to appear, 2020.

[10] N. Babu, I. Donevski, A. Valcarce, P. Popovski, J. J. Nielsen and C. B. Papadias, “Fairness Based Energy-Efficient 3D Path Planning of a Portable Access Point: A Deep Reinforcement Learning Approach,” in IEEE Open Journal of the Communications Society, 2022.

[11] M. Virgili, N. Babu, I. Valiulahi, M. Javidsharifi, C. Masouros, A. J. Forsyth, T. Kerekes, C. B. Papadias, “Cost-Efficient Design of an Energy-Neutral UAV-Based Mobile Network”, in IEEE Transactions on Communications, 2022.

[12] N. Babu, M. Virgili, M. Al-jarrah, X. Jing, E. Alsusa, P. Popovski, A. Forsyth, C. Masouros, C. B. Papadias, “Energy-Efficient Trajectory Design of a Multi-IRS Assisted Portable Access Point,” in IEEE Transactions on Vehicular Technology, 2022.

[13] N. Babu, M. Virgili, C. B. Papadias, P. Popovski and A. Forsyth, “Cost- and Energy-Efficient Aerial Communication Networks with Interleaved Hovering and Flying,” in IEEE Transactions on Vehicular Technology, vol. 70, no. 9, pp. 9077-9087, Sept. 2021.

[14] M. T. Barros, H. Siljak, P. Mullen, C. Papadias, J. Hyttinen, N. Marchetti, “Objective Supervised Machine Learning-Based Classification and Inference of Biological Neuronal Networks,” Molecules, 2022, 27(19), p.6256, ISSN 1420-3049.

[15] A. S. de Sena, P. H. J. Nardelli, D. B. d. Costa, U. S. Dias, P. Popovski and C. B. Papadias, “Dual-Polarized IRSs in Uplink MIMO-NOMA Networks: An Interference Mitigation Approach,” in IEEE Wireless Communications Letters, vol. 10, no. 10, pp. 2284-2288, Oct. 2021.

[16] A. S. de Sena, P. H. J. Nardelli, D. B. da Costa, P. Popovski and C. B. Papadias, “Rate-Splitting Multiple Access and Its Interplay with Intelligent Reflecting Surfaces,” in IEEE Communications Magazine, vol. 60, no. 7, pp. 52-57, July 2022.

Conference Papers (Appeared/Accepted)

[1] N. Babu, P. Popovski, and C. B. Papadias, “Cost-Efficient Deployment of a Reliable Multi-UAV Unmanned Aerial System,” in 2022 IEEE 96th Vehicular Technology Conference, VTC2022-Fall Workshops, London/ Beijing, 26-29 September 2022.

[2] N. Ntetsikas, N. Babu, M. H. Tariq, C Papadias, J. Du, D. Chizhik, R. Valenzuela, M. Rodriguez, R. Feick, “60GHz Outdoor to Indoor (O2I) Propagation Measurements in a University Campus,” in 23rd International Workshop on Signal Processing Advances in Wireless Communication (SPAWC) (IEEE SPAWC 2022).

[3] A. S. de Sena, D. B. da Costa, Z. Ding, P. H. J. Nardelli, U. Dias, and C. B. Papadias, “Successive sub-array activation for Massive MIMO-NOMA networks,” IEEE International Conference on Communications, June 7-11, 2020.

[4] G. K. Papageorgiou, M. Sellathurai, D. K. Ntaikos, C. B. Papadias, “3D beamforming with multi-active multi-passive antenna arrays using stochastic optimization,” 21st IEEE Workshop on Signal Processing Advances in Wireless Communications (SPAWC 2020), May 26-29, 2020 (virtual conference).

[5] M. Haroon Tariq, I. Chondroulis, P. Skartsilas, N. Babu and C. B. Papadias, “mmWave Massive MIMO channel measurements for fixed wireless and smart city applications,” IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC 2020), Aug. 31 – Sept. 3, 2020 (virtual conference).

[6] N. Babu, K. Ntougias, P. Popovski and C. B. Papadias, “Energy efficient altitude optimization of an aerial access Point,” IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC 2020), Aug. 31 – Sept. 3, 2020 (virtual conference).

White Papers

[1] C. B. Papadias, I Chondroulis, M. H. Tariq, N. Babu, T. Barratt, F. Undi, J. Kusuma, K. Mangalmurti, E. Tanghe, D. de Beelde, Z. Aslam, W. Joseph, D. Lai, N. Golmie, A. Gosain, S. G. Sanchez, L. Bertizzolo, L. Bonati, M. Polese, H. B. Tulay, Y. Corre, A. Zubow, and S. Goldstein, “TIP channel sounder program results summary report,” white paper published by the Telecom Infra Project (TIP) mmWave Networks Project Group, Sept. 2020, available online here.

[2] Upcoming Special Issue on “Aerial Wireless Networks,” IEEE Open Journal of the Communications Society (IEEE OJCOMS), co-edited by C. B. Papadias.

Recent & Special Issues & Workshops

[1] EU Project PAINLESS 2nd Summer School and Workshop, June 1-5, 2020 (online), co-organized by C. B. Papadias.

[2] Workshop on “Communication and Networking Algorithms for Cyber-Physical Systems in Industry 4.0,” co-located with IEEE PIMRC 2020, Aug. 31, 2020, co-organized by C. B. Papadias