Article
Optics
Robert B. Kohlhaas, Steffen Breuer, Sven Mutschall, Mathias Kehrt, Simon Nellen, Lars Liebermeister, Martin Schell, Bjoern Globisch
Summary: Electromagnetic waves in the terahertz (THz) frequency range are widely used in spectroscopy, imaging, and sensing. However, there is currently no commercial, table-top system available that covers the entire frequency range from 100 GHz to 10 THz. Fiber-coupled spectrometers that use photoconductive antennas as emitters and receivers have a bandwidth limited to 6.5 THz, and some suffer from spectral artifacts above 4 THz. The main reason for these limitations is identified as THz absorption in the polar substrate of the photoconductive antenna. To overcome these limitations, the researchers developed photoconductive membrane (PCM) antennas, which consist of a 1.2 μm-thin InGaAs layer bonded on a Si substrate. These antennas combine efficient THz generation and detection in InGaAs with absorption-free THz transmission through a Si substrate. With these devices, they demonstrated a fiber-coupled THz spectrometer with a total bandwidth of 10 THz and an artifact-free spectrum up to 6 THz. The PCM antennas present a promising path toward fiber-coupled, ultrabroadband THz spectrometers.
Article
Engineering, Electrical & Electronic
Dongju Cao, Wendong Yang, Ning Li
Summary: This paper investigates a multiple UAVs relaying wireless network for providing reliable wireless communication services. An optimization algorithm is proposed to maximize the average throughput, and its efficiency and convergence are validated through numerical results. The study demonstrates that the proposed design can significantly enhance system performance compared to benchmark schemes.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Andreas Nicolaides, Constantinos Psomas, Ioannis Krikidis
Summary: This paper investigates a cooperative protocol for a multi-hop network with relays of finite buffers, based on a myopic decode-and-forward strategy. The theoretical framework models the evolution of buffers and relay operations as a state Markov chain, analyzing performance in terms of outage probability and diversity-multiplexing tradeoff. Results show that the protocol outperforms conventional multi-hop relaying and performance depends on cooperation among neighboring nodes and communication models.
IEEE JOURNAL OF SELECTED TOPICS IN SIGNAL PROCESSING
(2022)
Article
Engineering, Electrical & Electronic
Viduneth Ariyarathna, Arjuna Madanayake, Josep M. M. Jornet
Summary: The development of wireless technologies in various fields such as mobile broadband communications, health care, and robotics necessitates faster and more reliable connections in both urban and rural areas. Over the past 30 years, wireless data rates have been doubling every 18 months. It is expected that terabits-per-second (Tbps) data rates will become a reality within the next five years and will be a major focus in designing 6G networks.
IEEE MICROWAVE MAGAZINE
(2023)
Article
Engineering, Electrical & Electronic
Yifan Gu, Qian Wang, He Chen, Yonghui Li, Branka Vucetic
Summary: The paper investigates the age minimization problem for a two-hop relay system, proposing an optimal policy and a low-complexity alternative with two thresholds. Theoretical analysis and numerical results show that the low-complexity policy achieves near-optimal performance compared to the optimal policy.
IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS
(2021)
Article
Automation & Control Systems
Jianying Di, Cheng Tan, Zhengqiang Zhang, Wing Shing Wong
Summary: In this paper, the operator spectrum theory is applied to study the general stabilisation issues for mean-field stochastic Markov jump systems (MF-SMJSs) with multiple delays, multiplicative noises, and homogeneous Markov chain. The innovative contributions include the adoption of a feasible model augmented strategy and the generalisation of the notions of interval stabilisation and essential destabilisation to MF-SMJSs. The necessary and sufficient stabilisation conditions are derived and can be verified by LMI feasibility tests.
IET CONTROL THEORY AND APPLICATIONS
(2023)
Article
Computer Science, Information Systems
Veerapu Goutham, V. P. Harigovindan
Summary: This paper proposes a non-orthogonal multiple access based cooperative relaying strategy (NOMA-CRS) for underwater acoustic sensor networks (UASNs), and investigates its performance under various conditions. The results show that NOMA-CRS can significantly improve the symbol rate and energy efficiency, although there is a slight degradation in outage performance.
Article
Computer Science, Information Systems
Ciro D'apice, Maria Pia D'arienzo, Alexander Dudin, Rosanna Manzo
Summary: This research examines a multitline queuing system in a Cognitive Radio Network (CRN) that serves two Markovian arrival flows of users. High Priority Users (HPUs) have preemptive priority over Low Priority Users (LPUs). LPUs are only accepted if the number of busy servers at the arrival epoch is less than the threshold M. The purpose of the study is to optimize the threshold and admission blocking period.
Article
Automation & Control Systems
Li Jin, Mladen Cicic, Karl H. Johansson, Saurabh Amin
Summary: Platooning of connected and autonomous vehicles has the potential to improve throughput, but interaction with non-CAVs may limit this improvement. This study introduces a new fluid model for mixed-autonomy traffic flow and proposes a tandem-link model for analyzing and designing platoon coordination strategies to maximize throughput and minimize delay. The stability conditions of the fluid model enable quantitative analysis of highway capacity under various scenarios, and the proposed coordination strategies are proven to be optimal and practically relevant in the fluid model.
IEEE TRANSACTIONS ON AUTOMATIC CONTROL
(2021)
Article
Engineering, Electrical & Electronic
Yicheng Chen, Rick S. Blum, Brian M. Sadler
Summary: This paper discusses the quickest change detection problem in a sensor network, and proposes distributed computation methods based on DGM that are capable of producing the optimal centralized test statistic. By using clique statistics and ordered transmission approach, communication efficiency is improved and transmission times are saved effectively.
IEEE TRANSACTIONS ON SIGNAL PROCESSING
(2021)
Article
Computer Science, Hardware & Architecture
Anastasios Giovanidis, Bruno Baynat, Clemence Magnien, Antoine Vendeville
Summary: This study introduces an original mathematical model to analyze the diffusion of posts within an online social platform, considering each user's individual Wall and Newsfeed. The model derives closed form probabilities of post propagation and defines a new measure of per-user influence, the psi-score, which accurately ranks influencers based on their position in the graph and posting activity. The model is flexible and effective in accurately ranking influencers with asymmetric posting activity in real-world applications.
IEEE-ACM TRANSACTIONS ON NETWORKING
(2021)
Article
Automation & Control Systems
Pavel A. Mikheev, Vasiliy V. Poddubny, Pavel Pristupa, Sergey P. Sushchenko, Peshang Kh Karim
Summary: This study proposes an indicator model for a transport connection to analyze the selective failure mode under competition between different subscriber connections for transmitting path bandwidth. The operation of the transport connection is described using a two-dimensional Markov chain with discrete time and a finite number of states. The contention indicator is measured by the queues of competitive data flows in the transit nodes of the transport connection. An analysis of the available bandwidth under various competitive conditions is conducted.
VESTNIK TOMSKOGO GOSUDARSTVENNOGO UNIVERSITETA-UPRAVLENIE VYCHISLITELNAJA TEHNIKA I INFORMATIKA-TOMSK STATE UNIVERSITY JOURNAL OF CONTROL AND COMPUTER SCIENCE
(2022)
Article
Computer Science, Information Systems
Xin-Wei Yao, Yi-Wei Chen, Yi Wu, Kai Zhao, Josep M. Jornet
Summary: This article proposes a flow-guided opportunistic routing (FGOR) protocol for intrabody nanonetworks to improve throughput and reduce energy consumption using a relative position (RP) model and a mobility gradient (MG) model.
IEEE INTERNET OF THINGS JOURNAL
(2022)
Article
Engineering, Electrical & Electronic
Amit Sangwan, Josep Miquel Jornet
Summary: With advancements in nanotechnology, novel nanosensing technologies are crucial in today's society, with plasmonic sensing showing unprecedented reliability and resolution. By combining plasmonic sensing with nanoscale communication, a concept of joint nanoscale communication and bio-sensing systems can be achieved for more accurate diagnoses and reduced load on medical testing infrastructure. The proposed system models changes in frequency response of biofunctionalized plasmonic nanoantennas, utilizes a chirp-spread spectrum excitation and detection system, and presents numerical results to demonstrate performance.
IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Akram Shafie, Nan Yang, Chong Han, Josep M. Jornet
Summary: This paper presents a novel spectrum allocation strategy for multiuser terahertz band communication systems. This strategy allows users to occupy sub-bands with unequal bandwidths and optimally avoids using spectra with high molecular absorption loss. Numerical results demonstrate the effectiveness of this strategy.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2022)
Article
Computer Science, Hardware & Architecture
Keerthi Priya Dasala, Josep M. Jornet, Edward W. Knightly
Summary: This paper proposes a novel framework called SIMBA, which enables multi-stream multi-user downlink transmission via a single RF chain. By introducing user grouping and beam selection policies, SIMBA achieves high data rates and low latency for multi-user transmission. It is of significant importance for scaling the data rate of multi-user 60 GHz WLAN.
IEEE-ACM TRANSACTIONS ON NETWORKING
(2022)
Article
Engineering, Electrical & Electronic
Jacob Hall, Josep Miquel Jornet, Ngwe Thawdar, Tommaso Melodia, Francesco Restuccia
Summary: This article presents the first experimental study of modulation and bandwidth classification (MBC) at THz frequencies through deep learning techniques. The study proves the feasibility and effectiveness of MBC at THz frequencies and proposes a boosting technique to improve inference quality.
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Priyangshu Sen, Jose V. V. Siles, Ngwe Thawdar, Josep M. M. Jornet
Summary: Sub-terahertz and terahertz-band communication technologies ranging from 100 GHz to 10 THz will be necessary for future wireless communication networks beyond 6G. While progress has been made in terahertz device technology for personal and local area networks, longer communication distances are needed to fully utilize the capacity of sub-terahertz and terahertz wireless links. In this study, we demonstrate a multi-kilometre and multi-gigabit-per-second link operating at 210-240 GHz using on-chip power-combining frequency multiplier designs and tailored software-defined ultrabroadband digital signal processing.
NATURE ELECTRONICS
(2023)
Article
Engineering, Aerospace
Ali J. Alqaraghuli, Jose V. Siles, Josep M. Jornet
Summary: This article explores terahertz and optical wireless communication technologies as the two projected high-data-rate cross-link communication technologies, and compares them in terms of device technology capabilities and wireless propagation properties. A performance analysis directly compares the two technologies for space communication in low Earth orbit constellations. More importantly, a roadmap is provided to push both ultrabroadband wireless technologies forward.
IEEE AEROSPACE AND ELECTRONIC SYSTEMS MAGAZINE
(2023)
Article
Engineering, Electrical & Electronic
Duschia Bodet, Priyangshu Sen, Zahed Hossain, Ngwe Thawdar, Josep M. Jornet
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Josep Miquel Jornet, Amit Sangwan
Summary: The possibility to control matter at the atomic and molecular scale opens up the potential for new devices with unprecedented physical properties. For the wireless communications community, the development of miniature transceivers and antennas operating in uncharted frequency bands offers transformative applications across different scales, domains, and realms. This article presents the state of the art in electromagnetic nanoscale communication and networks, starting from the bottom-up approach. It discusses innovative applications, physical properties, and capabilities of nano-transceivers and nano-antennas, as well as propagation phenomena and tailored communication and networking solutions.
IEEE NANOTECHNOLOGY MAGAZINE
(2023)
Article
Telecommunications
Jorge Torres Gomez, Jennifer Simonjan, Josep Miquel Jornet, Falko Dressler
Summary: This letter focuses on investigating the intra-body communication channel between nanosensors and gateways attached to the skin using the terahertz spectrum. The study considers the impact of noise and mobility on communication performance and derives the trade-off between them.
IEEE COMMUNICATIONS LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Viduneth Ariyarathna, Arjuna Madanayake, Josep M. M. Jornet
Summary: The development of wireless technologies in various fields such as mobile broadband communications, health care, and robotics necessitates faster and more reliable connections in both urban and rural areas. Over the past 30 years, wireless data rates have been doubling every 18 months. It is expected that terabits-per-second (Tbps) data rates will become a reality within the next five years and will be a major focus in designing 6G networks.
IEEE MICROWAVE MAGAZINE
(2023)
Article
Computer Science, Hardware & Architecture
Keerthi Priya Dasala, Josep Miquel Jornet, Edward W. Knightly
Summary: This paper presents a novel framework named UMBRA for supporting multi stream multi-user uplink transmissions via a single RF chain AP. It designs multi-user overlayed constellations and multi-user receiver mechanisms to enable concurrent time-triggered uplink multi-user transmissions received on a single RF chain AP. Experimental results show that UMBRA achieves more than 1.45x improvement in aggregate rate compared to single-user transmissions under different conditions.
IEEE-ACM TRANSACTIONS ON NETWORKING
(2023)
Article
Engineering, Electrical & Electronic
Michele Polese, Xavier Cantos-Roman, Arjun Singh, Michael J. Marcus, Thomas J. Maccarone, Tommaso Melodia, Josep M. Jornet
Summary: This paper discusses the potential for spectrum sharing among different stakeholders in the above 100 GHz spectrum, and the importance of avoiding harmful interference and disruption. It provides a tutorial on current regulations and highlights the need for sharing to maximize spectrum utilization. Through detailed simulations, it identifies scenarios where active users may introduce interference to passive sensing and reviews promising techniques for enabling active/passive sharing. The critical review and tutorial in this paper have the potential to drive future research and regulations that promote safe coexistence and benefit digital technologies and scientific exploration.
PROCEEDINGS OF THE IEEE
(2023)
Review
Multidisciplinary Sciences
Josep M. Jornet, Edward W. Knightly, Daniel M. Mittleman
Summary: This article discusses the challenges and potential applications of wireless platforms above 100 GHz. There is rapid advancement in the field of sub-terahertz wireless communications, with major research efforts worldwide. To overcome the hurdles associated with using these high frequencies, new capabilities for sensing and manipulating broadcasts are required. A vision for future wireless systems is emerging, addressing the forefront challenges and solutions beyond 5G.
NATURE COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Duschia M. Bodet, Josep M. Jornet
Summary: This work presents a brief survey of sub-THz and THz multiple antenna systems and suggests using more directional antenna elements to increase data rates. Both numerical and experimental analyses demonstrate the advantages of directional antenna elements.
IEEE OPEN JOURNAL OF THE COMMUNICATIONS SOCIETY
(2023)
