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
Computer Science, Interdisciplinary Applications
Yuqing Yang, Weimin Wang, Bihua Tang, Yongle Wu, Junsong Jia, Hui Li, Yuanan Liu
Summary: This article presents measurements and simulations of terahertz indoor channels. Measurements and simulations are conducted in different environments to study the path loss and time-frequency characteristics of indoor channels. The results show that strong multipath exists in the line-of-sight environment, while in the reflected non-line-of-sight environment, the path loss is similar to free-space path loss and varies with the angle between the reflecting surface and the table.
INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING
(2022)
Article
Computer Science, Information Systems
Weizheng Zhang, Wei Wang, Wei Zhang
Summary: Reconfigurable intelligent surface (RIS) is a powerful tool in assisting large-scale tera-hertz (THz) communication, especially when the line-of-sight (LoS) propagation link is blocked. However, conventional far-field based channel training mismatches with the near-field channel characteristics, resulting in performance loss. This letter investigates the near-field channel training for an indoor RIS aided THz communication system and proposes a BS channel training method based on particle swarm optimization (PSO) to accommodate the unified near-field channel model. Simulation results show the effectiveness of the proposed channel training and the improved UE received signal-to-noise ratio (SNR) with RIS illumination under imperfect channel and localization.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2023)
Article
Computer Science, Information Systems
Brecht De Beelde, Emmeric Tanghe, Claude Desset, Andre Bourdoux, David Plets, Wout Joseph
Summary: The article presents channel measurements in an office environment, discussing the model of Line-of-Sight path loss and attenuation due to blockage by desk objects and plant obstructions. The experiment found that the measured attenuation is higher when the distance between antennas decreases.
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
Computer Science, Information Systems
Liang Yin, Ruonan Yang, Yuliang Yao
Summary: Researchers developed a 6G indoor millimeter wave channel sounding system and trained a scene classification model using machine learning to extract fingerprint features from different scenarios, achieving accurate identification and classification of high-frequency millimeter wave signals.
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
Naveed A. Abbasi, Jorge Gomez-Ponce, Revanth Kondaveti, Shahid M. Shaikbepari, Shreyas Rao, Shadi Abu-Surra, Gary Xu, Jianzhong Zhang, Andreas F. Molisch
Summary: This paper presents the first extensive set of channel measurements for urban outdoor environments in the THz band, providing valuable insights into key channel characteristics. The results demonstrate the feasibility of outdoor communication over tens of meters in the 145-146 GHz frequency range, even in non-line-of-sight scenarios. The measurements also reveal significant delay spreads, angular spreads, and a large number of multipath components in this frequency range.
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Shihao Ju, Yunchou Xing, Ojas Kanhere, Theodore S. Rappaport
Summary: This study presents an indoor 3-D spatial statistical channel model for mmWave and sub-THz frequencies based on extensive radio propagation measurements at 28 and 140 GHz. The resulting channel statistics show that the number of time clusters follows a Poisson distribution and the number of subpaths within each cluster follows a composite exponential distribution. A unified indoor statistical channel model for mmWave and sub-Terahertz frequencies is proposed, and a corresponding indoor channel simulator is developed for future air-interface, beamforming, and transceiver designs in 6G and beyond.
IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Yongzhi Wu, Joonas Kokkoniemi, Chong Han, Markku Juntti
Summary: This study analyzed the indoor blockage effects in the THz band and proposed a THz channel model, deriving the aggregated interference and theoretical expressions to approximate coverage probability and average network throughput. Results showed that for the nearest-AP user association scheme, the optimal AP density is 0.15/m^2, leading to improved coverage probability and network throughput.
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2021)
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
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
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
Computer Science, Information Systems
Lorenzo Rubio, Vicent M. Rodrigo Penarrocha, Marta Cabedo-Fabres, Bernardo Bernardo-Clemente, Juan Reig, Herman Fernandez, Jesus R. Perez, Rafael P. Torres, Luis Valle, Oscar Fernandez
Summary: In this paper, the path loss characterization at millimeter-wave frequencies in a typical indoor office environment is studied. The path loss results are derived from measurements collected in the 25-40 GHz frequency band under both line-of-sight and obstructed-LOS conditions. Different models, including the close-in free space reference distance and floating-intercept models, are used to analyze the path loss at different frequencies. The results provide valuable insights into the propagation behavior at mmWave frequencies and are helpful for the simulation and performance evaluation of future wireless communication systems in indoor hotspot environments.
Article
Engineering, Electrical & Electronic
Fatima Taleb, Goretti G. Hernandez-Cardoso, Enrique Castro-Camus, Martin Koch
Summary: Future communication technologies are moving towards higher frequencies to meet the growing demand for data rates. Terahertz frequencies show potential for high-speed and high data rate communications. However, the high free-space damping above 100 GHz limits communication systems to short-range, non-line-of-sight transmission links that rely on reflection properties. This study investigates the scattering coefficients of 50 building materials and provides important insight for modeling THz communication channels.
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY
(2023)