Article
Ecology
Wei Chen, Changzhen Li, Junyi Yu, Jing Zhang, Fuxing Chang
Summary: Maritime communications play a crucial role in ensuring communication and navigational safety during maritime activities, but they currently rely heavily on satellite communication systems which are costly, have limited coverage, and low data rates. Therefore, research on maritime communications based on broadband technology has gained attention, requiring a deeper understanding of the characteristics of wireless channels.
REGIONAL STUDIES IN MARINE SCIENCE
(2021)
Article
Computer Science, Information Systems
Mauro Tropea, Floriano De Rango
Summary: As demands on the network continue to grow, it is increasingly important to upgrade the existing infrastructure in order to offer higher bandwidth and service level guarantees to users. Satellite networks are considered crucial for future hybrid architectures, and understanding the propagation characteristics of satellite channels is fundamental for designing communication systems that meet new user needs. This paper reviews recent developments in satellite channel communications for mobile services, focusing on land mobile satellite systems, and presents various Markov models proposed in the literature.
Article
Engineering, Electrical & Electronic
Boyu Hua, Haoran Ni, Qiuming Zhu, Cheng-Xiang Wang, Tongtong Zhou, Kai Mao, Junwei Bao, Xiaofei Zhang
Summary: This paper proposes a three-dimensional non-stationary hybrid model for UAV-to-ground channel in order to capture the channel characteristics of UAV's 3D trajectory, posture variation, and fuselage scattering effect. The channel parameters are generated using machine learning and ray tracing techniques, and the impact of posture variation and fuselage scattering on statistical properties is analyzed. The validity of the proposed model is verified by comparing simulation results with measured ones.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2023)
Article
Green & Sustainable Science & Technology
Milutin Nesic, Nenad Milosevic, Petar Spalevic, Zorica Nikolic, Marko Smilic
Summary: In this paper, a wireless mobile communication system with a cooperative network operating over a mobile-to-mobile (M2M) fading channel in the presence of co-channel interference is investigated. The desired signal and co-channel interference are modeled using the Nakagami-m fading distribution. The performance analysis of the proposed system for the increasing popularity of M2M communication in 5G cellular networks is of great importance. Closed-form expressions for the probability density function (PDF) and cumulative distribution function (CDF) of the signal-to-interference ratio (SIR) are derived, and the outage probability (Pout) and level crossing rate (LCR) are evaluated.
Article
Engineering, Electrical & Electronic
Leyre Azpilicueta, Alper Schultze, Mikel Celaya-Echarri, Fidel A. Rodriguez-Corbo, Costas Constantinou, Raed M. Shubair, Francisco Falcone, Miguel Navarro-Cia
Summary: This article addresses the challenges of modeling scattering and atmospheric absorption in the terahertz frequency band by measuring the dielectric properties of common building and office materials and developing a 3D ray-launching algorithm. The proposed channel model approach has been validated through simulations and measurements, providing valuable knowledge for the development of ultrahigh-speed wireless communication systems.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Rashid Faqiri, Chloe Saigre-Tardif, George C. Alexandropoulos, Nir Shlezinger, Mohammadreza F. Imani, Philipp del Hougne
Summary: Programmable radio environments using reconfigurable intelligent surfaces (RISs) are gaining popularity as a new wireless communications paradigm. However, current channel models used for signal-processing algorithms are unable to accurately incorporate fading effects based on wave physics. To address this, we propose PhysFad, a physics-based end-to-end model of RIS-parametrized wireless channels with adjustable fading. PhysFad includes space and causality concepts, frequency selectivity, and the intertwinement of phase and amplitude responses of RIS elements, as well as mutual coupling effects. We thoroughly characterize PhysFad and demonstrate its capabilities for RIS-enabled over-the-air channel equalization in rich-scattering wireless communications, providing a user-friendly code for the community to transition to physics-based models.
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Mi Yang, Bo Ai, Ruisi He, Zhangfeng Ma, Hang Mi, Dan Fei, Zhangdui Zhong, Yujian Li, Jing Li
Summary: In this article, channel measurements at 5.9 GHz in street intersection scenarios are conducted to provide data for the characterization and modeling of time-varying vehicular channels. A double-slope path loss model is proposed to accurately reflect the signal propagation loss at intersections. Furthermore, the time-varying spatial characteristics of multipath are extracted and analyzed, and the azimuth and elevation spread of arrival are statistically characterized. The research in this article can enrich the investigation of vehicular channels and enable the analysis and design of vehicular communication systems.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Computer Science, Theory & Methods
Khurram Shahzad, Xiangyun Zhou
Summary: The study reveals that in covert communications over quasi-static block fading channels, the adversary's detection performance is not improved by having perfect channel state information (CSI), allowing for covert transmission design without considering channel uncertainty. The optimal and suboptimal closed-form solution to covert transmission design is obtained, demonstrating fundamental differences in design compared to non-fading AWGN channels.
IEEE TRANSACTIONS ON INFORMATION FORENSICS AND SECURITY
(2021)
Review
Computer Science, Hardware & Architecture
Selma Yahia, Yassine Meraihi, Amar Ramdane-Cherif, Asma Benmessaoud Gabis, Dalila Acheli, Hongyu Guan
Summary: This paper provides a comprehensive survey of VLC channel modeling techniques, describing the main components and different channel models in various environments, comparing algorithms proposed in each environment, and giving concluding remarks and future research directions for VLC channel models.
JOURNAL OF NETWORK AND COMPUTER APPLICATIONS
(2021)
Article
Computer Science, Information Systems
Osama S. Faragallah, M. Farouk, Hala S. El-sayed, Mohsen A. M. El-bendary
Summary: This paper presents an efficient model for secure audio signal transmission over the wireless noisy uncorrelated Rayleigh fading channel, and analyzes the performance of a multiple secret keys-based audio cryptosystem in different transformation domains.
CMC-COMPUTERS MATERIALS & CONTINUA
(2022)
Article
Engineering, Electrical & Electronic
Artur Adolfo Falkovski, Eduardo Vinicius Kuhn, Marcos Vinicius Matsuo, Ciro Andre Pitz, Eduardo Luiz Ortiz Batista, Rui Seara
Summary: This paper proposes a stochastic model for the constrained normalized least-mean-square (CNLMS) algorithm, which includes expressions for weight behavior, SINR evolution, correlation matrix, and steady-state values. Simulation results validate the accuracy of the proposed model in the context of an adaptive antenna array under different operating conditions.
Article
Telecommunications
Shanyun Liu, Xianbin Yu, Rongbin Guo, Yajie Tang, Zhifeng Zhao
Summary: The terahertz (THz) band is seen as a key technology for future wireless communication systems to meet data rates at terabit per second scale. Research on THz channel modeling is increasingly important, focusing on factors such as molecular absorption loss, misalignment fading, and multipath fading.
CHINA COMMUNICATIONS
(2021)
Article
Optics
C. hakan Arslan, Fikadu t. Dagefu, Terrence j. Moore, Michael j. Weisman, Robert j. Drost
Summary: There is an increasing interest in ultraviolet (UV) communications as a means for non-line-of-sight (NLOS) networking using atmospheric scattering. However, there is limited experimental research and validation of the analytical models. This paper presents a flexible experimental system for precise UV channel and communications measurements, demonstrating good agreement with theory and simulation.
Article
Chemistry, Analytical
Hang Li, Zhiqun Cheng
Summary: In this research, a novel phase shift design is proposed for angle-of-arrival (AoA) estimation in localized hybrid arrays, which significantly improves estimation accuracy. By exploiting different beam steering, calibrating cross-correlations, and enhancing phase offset estimation between adjacent subarrays, the proposed approach shows great improvement in estimation accuracy compared to existing methods when the ratio N/K is even.
Article
Optics
Xiang Lu, Herbert Gross
Summary: In this study, the impact of different frequency components of surface errors induced by diamond-turned surface grinding on image quality is analyzed, and a Wigner function-based approach is proposed to model light as partially coherent. By selecting the proper definition of light coherence, a unified model is presented that combines statistical and deterministic models of surface errors, enabling efficient, simultaneous simulation of multiple scattering from high- and mid-spatial frequency surface errors, as well as the interference and edge diffraction of light.
