Review
Engineering, Electrical & Electronic
M. A. Salhi, T. Kleine-Ostmann, T. Schrader
Summary: This review discusses propagation channel measurements in an extremely broad frequency range from 50 to 325 GHz, which is crucial for future indoor wireless communication systems to provide high-speed data transmission.
JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES
(2021)
Article
Engineering, Electrical & Electronic
Marina Lotti, Mathieu Caillet, Raffaele D'Errico
Summary: In this article, a multiband channel characterization at sub-THz is presented, based on three measurement campaigns conducted in an indoor environment. Different frequency ranges were explored, and LOS and NLOS propagation scenarios were considered. The article focuses on the extraction of omnidirectional power angular delay profile from directional measurements and presents modeling and cluster study of large-scale parameters.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Jinbang Fu, Erik J. J. Jorgensen, Prateek Juyal, Alenka Zajic
Summary: This article proposes a ResNet-based feature concatenated neural network model to predict the scenario type and attribute with PDP as the inputs. The model consists of three blocks for feature extraction, scenario prediction, and attribute prediction. Data augmentation is used to expand the measured dataset for training and evaluation. The proposed model performs well on the expanded dataset with almost 100% accuracy, while the MLP-based model shows degradation on attribute prediction.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Telecommunications
Yan Zhang, Lei Zhao, Zunwen He
Summary: A three-dimensional dynamic indoor THz channel model is proposed in this paper, which combines deterministic and stochastic modeling approaches and considers molecular absorption and diffuse scattering. The statistical properties are investigated and the practicality of the model is verified by comparing with measurement results.
CHINA COMMUNICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Chun-Hsing Li, Te-Yen Chiu
Summary: This article proposes low-loss terahertz (THz) interconnects for THz system-on-package heterogeneous integration, with the capability of single-band, dual-band, and broadband operations. The proposed interconnects are experimentally validated and provide low insertion loss and high return loss at different frequencies of interest.
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY
(2022)
Article
Optics
Yi Ji Tan, Wenhao Wang, Abhishek Kumar, Ranjan Singh
Summary: Valley photonic crystal (VPC) is a versatile platform in topological photonics, and this study explores the design of a composite interface junction to enable the topologically protected propagation of THz waves. The work illustrates the prospects and challenges of interfacial topological photonics in the design of broadband silicon topological waveguides.
Article
Engineering, Electrical & Electronic
Yi Chen, Yuanbo Li, Chong Han, Ziming Yu, Guangjian Wang
Summary: This study investigates the indoor channel characteristics of THz communications by conducting extensive channel measurement activities and studying hybrid channel models. Through careful system calibration, MPC clustering, and ray-tracing techniques, the research comprehensively analyzes the propagation features and multi-path characteristics of THz signals.
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Kursat Tekbyk, Ali Rza Ekti, Gunes Karabulut Kurt, Ali Gorcin, Serhan Yarkan
Summary: This study proposes a Gamma mixture based channel modeling for the THz band using the expectation-maximization (EM) algorithm, providing a more accurate approach to characterize THz wireless channels. The method is validated using error metrics and statistical tests on measurement data, showing that the mixture of Gamma distributions fits well with the actual data.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2021)
Article
Computer Science, Information Systems
Jose A. Cortes, Francisco J. Canete, Luis Diez
Summary: This paper focuses on the initial channel estimation used in indoor broadband power line communications (PLC) systems. Simple channel estimation techniques are proposed and compared with other commonly used estimators in wireless scenarios. Performance analysis on 171 measured indoor PLC channels shows that estimators based on the header symbols outperform those based on the preamble symbols.
JOURNAL OF COMMUNICATIONS AND NETWORKS
(2022)
Article
Computer Science, Information Systems
Alexander Shurakov, Dmitri Moltchanov, Anatoliy Prikhodko, Abdukodir Khakimov, Evgeny Mokrov, Vyacheslav Begishev, Ivan Belikov, Yevgeni Koucheryavy, Gregory Gol'tsman
Summary: This paper empirically investigates the characteristics of human body blockage at a carrier frequency of 156 GHz. The findings show that the mean attenuation ranges from 8 to 15 dB, the blockage duration varies within 360-390 ms for different transmission distances, and the signal rise and fall times increase with the transmission distance.
COMPUTER COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Ke Guan, Bile Peng, Danping He, Johannes M. Eckhardt, Haofan Yi, Sebastian Rey, Bo Ai, Zhangdui Zhong, Thomas Kuerner
Summary: To achieve the vision of smart rail mobility, high-data rate wireless connectivity with up to dozens of gigahertz bandwidth is required, which drives the exploration of underutilized millimeter wave (mmWave) and sub-mmWave bands. In this study, the wireless channel within a smart rail mobility scenario is characterized through ultrawideband (UWB) channel sounding and ray tracing (RT) at mmWave and sub-mmWave bands, providing a more thorough understanding of the intrawagon mmWave and sub-mmWave channels.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Alberto Tarable, Francesco Malandrino, Laura Dossi, Roberto Nebuloni, Giuseppe Virone, Alessandro Nordio
Summary: This paper investigates the optimization of multiuser wireless networks in a smart radio environment using meta-surfaces at sub-THz frequencies. By modeling each meta-surface as an electronically steerable reflector with only two parameters, the complexity can be reduced and high communication rates can be achieved. The paper provides insights on system behavior through asymptotic analysis and numerical results.
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2022)
Article
Telecommunications
Mikkel Bengtson, Yejian Lyu, Wei Fan
Summary: With the increasing demand for high bandwidth wireless communication systems, researchers have been exploring millimeter wave (mmWave) and sub-terahertz (subTHz) frequency bands. Accurate channel modeling is crucial for system design and performance evaluation, which relies on reliable measured channel data. This paper presents a long-range 28 GHz and 300 GHz VNA-based channel sounder and performs measurements in an indoor corridor to understand the frequency dependence of channel parameters in typical deployment scenarios.
CHINA COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Sang-Rok Moon, Eon-Sang Kim, Minkyu Sung, Hae Young Rha, Eui Su Lee, IL-Min Lee, Kyung Hyun Park, Joon Ki Lee, Seung-Hyun Cho
Summary: This paper proposes an indoor network with a sub-terahertz-band wireless link for 6G applications. The feasibility and performance of the system are confirmed through experimental research and investigation, while also addressing the technical challenges and introducing potential solutions.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Computer Science, Information Systems
Hyuckjin Choi, Jaeky Oh, Jaehoon Chung, George C. Alexandropoulos, Junil Choi
Summary: This paper presents a novel three-dimensional (3D) ray-tracing simulator called WiThRay for performance assessment in smart wireless environments. WiThRay incorporates reconfigurable intelligent surfaces (RISs), which are key for RIS-enabled smart wireless communications. Channel data obtained from WiThRay matches well with the fundamental EM propagation theory.
Article
Engineering, Electrical & Electronic
Ke Guan, Bile Peng, Danping He, Johannes M. Eckhardt, Haofan Yi, Sebastian Rey, Bo Ai, Zhangdui Zhong, Thomas Kuerner
Summary: To achieve the vision of smart rail mobility, high-data rate wireless connectivity with up to dozens of gigahertz bandwidth is required, which drives the exploration of underutilized millimeter wave (mmWave) and sub-mmWave bands. In this study, the wireless channel within a smart rail mobility scenario is characterized through ultrawideband (UWB) channel sounding and ray tracing (RT) at mmWave and sub-mmWave bands, providing a more thorough understanding of the intrawagon mmWave and sub-mmWave channels.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Johannes M. Eckhardt, Vitaly Petrov, Dmitri Moltchanov, Yevgeni Koucheryavy, Thomas Kuerner
Summary: This paper presents a comprehensive measurement campaign to analyze wave propagation at 300 GHz in typical vehicular deployments, decomposing the generic vehicular scenario into basic setups for detailed analysis using a modular approach. The combination of measurement and modeling results is used to identify critical propagation effects that must be considered in applied studies.
IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS
(2021)
Article
Astronomy & Astrophysics
Johannes M. Eckhardt, Christoph Herold, Bo Kum Jung, Nils Dreyer, Thomas Kuerner
Summary: This article presents a modular link level simulator for the physical layer of beyond-5G and 6G wireless communication systems in the THz range. The simulator is validated and applied to a wirelessly augmented data center, showing that a LOS condition and sufficient transmit power are essential in the low THz range.
Article
Engineering, Electrical & Electronic
Hongyang Du, Jiayi Zhang, Ke Guan, Dusit Niyato, Huiying Jiao, Zhiqin Wang, Thomas Kuerner
Summary: The article introduces RIS-aided THz communications using reconfigurable intelligent surface technology. It accurately models the small-scale amplitude fading of THz signals through signal measurement experiments and optimizes the phase-shifts at RIS elements using a swarm intelligence-based method. Statistical characterizations of SNDR and SNR are derived, and asymptotic analysis is conducted to gain insights. Analytical expressions for outage probability and ergodic capacity are also derived, showing that increasing the number of RIS elements can significantly improve system performance.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Tobias Doeker, Johannes M. Eckhardt, Thomas Kuerner
Summary: This article presents a measurement campaign in a real aircraft investigating the radio channel at 300 GHz for different deployments of a wireless IFE system. The propagation effects, temporal and spatial channel characteristics, interference links, and path loss models are analyzed, providing insights for future IFE system design. The derived channel model and path loss models can be utilized in further simulations to contribute to the design of future IFE systems.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Engineering, Electrical & Electronic
Tobias Doeker, Christoph Herold, Johannes M. M. Eckhardt, Thomas Kurner
Summary: Low terahertz frequencies are potential candidates for future wireless communication systems. Despite the high path losses, highly directive antennas can be used to compensate for the losses, making eavesdropping challenging. This article evaluates eavesdropping possibilities by investigating the scattering properties of common office objects, such as a coffee cup, a thermos, and a laptop. The results show that eavesdropping opportunities are good when a thermos is used, while for other objects, direct eavesdropping results in lower secrecy capacity in most cases.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2023)
Article
Engineering, Electrical & Electronic
Tobias Doeker, Mate Boban, Thomas Kuerner
Summary: Future wireless communication systems at low terahertz frequencies face high attenuation losses, which necessitate the use of highly directive antennas. The authors propose a device discovery approach that combines ray tracing with iterative fine tuning. Previous investigations have shown the advantages of this approach over the iterative method, as well as the strong dependence of the ray tracing output on the accuracy of the environmental model. The authors further extend these works by evaluating the impact of antenna characteristics, particularly the sidelobes, on alignment accuracy.
IET MICROWAVES ANTENNAS & PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Johannes M. Eckhardt, Alper Schultze, Ramez Askar, Tobias Doeker, Michael Peter, Wilhelm Keusgen, Thomas Kuerner
Summary: In this paper, researchers present a uniform and collaborative data evaluation method for measurement sets from two different time-domain channel sounders. By extracting discrete multipath components, the properties of the propagation channel are analyzed. The impact of a realistic antenna array on the radio channel for the communication system is examined. The extracted multipath components are published as research data to serve future analytical studies and simulations in relevant scenarios for the sixth generation of mobile systems.
IEEE OPEN JOURNAL OF ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Jan C. Balzer, Clara J. Saraceno, Martin Koch, Priyansha Kaurav, Ullrich R. Pfeiffer, Withawat Withayachumnankul, Thomas Kuerner, Andreas Stoehr, Mohammed El-Absi, Ali Al-Haj Abbas, Thomas Kaiser, Andreas Czylwik
Summary: Terahertz systems offer enormous bandwidths for powerful spectroscopy and high-resolution imaging, as well as potential applications in communication and indoor localization.
IEEE JOURNAL OF MICROWAVES
(2023)
Article
Computer Science, Artificial Intelligence
Guillaume Jornod, Andreas Pfadler, Sofia Carreira, Ahmad El Assaad, Thomas Kuerner
Summary: This paper studies the influence of prediction on fuel saving in high-density platooning, and proposes an optimization method to maximize fuel saving. The research shows that a prediction horizon of at least one hundred seconds is needed for a five-truck platoon to benefit from high-density platooning.
IEEE OPEN JOURNAL OF INTELLIGENT TRANSPORTATION SYSTEMS
(2022)
Article
Computer Science, Information Systems
Chong Han, Yiqin Wang, Yuanbo Li, Yi Chen, Naveed A. Abbasi, Thomas Kuerner, Andreas F. Molisch
Summary: This article provides a comprehensive overview of the study of THz wireless channels, including measurement methods, modeling methodologies, channel characteristics, and future research directions.
IEEE COMMUNICATIONS SURVEYS AND TUTORIALS
(2022)
Article
Engineering, Electrical & Electronic
Bjoern Friebel, Michael Schweins, Nils Dreyer, Thomas Kuerner
Summary: This paper introduces an approach to estimate the localization accuracy by navigation systems like GPS, GLONASS or Galileo, by calculating the error due to multipath components using ray tracing, and considering 3D building data and a model for ionospheric error.
ADVANCES IN RADIO SCIENCE
(2021)
Article
Engineering, Electrical & Electronic
Bo Kum Jung, Thomas Kurner
Summary: The paper discusses the potential of THz links operating at 300 GHz according to the IEEE standard 802.15.3d (2017) and the transition from underground fiber connections to wireless backhaul connectivity. Weather conditions influence on the outdoor application of THz links is investigated through ray-tracing simulations, providing planning guidelines and outage probabilities for future applications.
ADVANCES IN RADIO SCIENCE
(2021)
Article
Computer Science, Information Systems
Zu-Kai Weng, Atsushi Kanno, Pham Tien Dat, Keizo Inagaki, Kosuke Tanabe, Eisaku Sasaki, Thomas Kurner, Bo Kum Jung, Tetsuya Kawanishi
Summary: This paper introduced a link budget evaluation for fixed wireless links under extreme weather conditions, focusing on high temperature, violent rain, and strong winds. A theoretical model was proposed to evaluate attenuation by wind effect, and the results confirmed heavy rain as a dominant factor in attenuation. Additionally, antenna gain degradation due to wind effect was found considerable for high frequency wireless links.
Article
Engineering, Electrical & Electronic
Paul Unterhuber, Michael Walter, Uwe-Carsten Fiebig, Thomas Kuerner
Summary: This article provides an accurate description of relevant propagation parameters for train-to-train scenarios, considering typical environments such as railway stations, open fields and hilly terrain with cutting. It discusses the stationarity of the channel in time and frequency, deriving power delay profiles and Doppler spectral densities. Furthermore, it presents distance-variant statistics on k-factor, delay spread, and Doppler frequency spread, showcasing the significant changes in these parameters for different environments and distances. Distance-dependent model parameters are proposed for all stochastic channel parameters in this study.
IEEE OPEN JOURNAL OF ANTENNAS AND PROPAGATION
(2021)
