Journal ArticleDOI
Analysis of the Relation Between Fresnel Zone and Path Loss Exponent Based on Two-Ray Model
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TLDR
In this article, the authors investigated the underlying factor that leads to the change of path loss exponent n, using a reasonable and reliable indirect demonstration that is based on the simple two-ray model and a developed multiray model.Abstract:
In this letter, the underlying factor that leads to the change of path loss exponent n is investigated, using a reasonable and reliable indirect demonstration that is based on the simple two-ray model and a developed multiray model. It is found that the first Fresnel zone is the underlying factor that affects n. n will change only if the situation of the obstacles in the first Fresnel zone changes. The conclusion helps to understand the essences of the propagation.read more
Citations
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DSF-NOMA: UAV-Assisted Emergency Communication Technology in a Heterogeneous Internet of Things
TL;DR: The simulation results confirm that the distributed SIC-free NOMA (DSF-NOMA) based on the MORA scheme provides satisfactory communication performances for the users and the devices with a tradeoff between the two subsystems.
Journal ArticleDOI
Measurement, Simulation, and Characterization of Train-to-Infrastructure Inside-Station Channel at the Terahertz Band
Ke Guan,Bile Peng,Danping He,Johannes M. Eckhardt,Sebastian Rey,Bo Ai,Zhangdui Zhong,Thomas Kurner +7 more
TL;DR: This paper measures, simulate, and characterize the train-to-infrastructure (T2I) inside-station channel at the terahertz (THz) band for the first time, and provides a baseline for system design and evaluation of THz communications.
Journal ArticleDOI
Channel measurements and models for high-speed train wireless communication systems in tunnel scenarios: a survey
TL;DR: In this paper, a comprehensive review of the measurement campaigns in tunnels and some tunnel channel models using various modeling methods is presented, and future directions in HST tunnel channel measurements and modeling are discussed.
Journal ArticleDOI
Indoor massivemultiple-inputmultiple-output channel characterization and performance evaluation
Jian-zhi Li,Ai Bo,Rui-si He,Qi Wang,Mi Yang,Bei Zhang,Ke Guan,Dan-ping He,Zhangdui Zhong,Ting Zhou,Nan Li +10 more
TL;DR: The measured channels, which are in a rich-scattering indoor environment, are found to achieve a performance close to that in independent and identically distributed Rayleigh channels even in an LOS scenario.
Journal ArticleDOI
Evaluation of LoRa Technology in Flooding Prevention Scenarios
TL;DR: The communication distance and reliability are significantly affected by tides when the communication is done over the water and nodes are placed at low heights, and a battery lifetime estimation model is derived that may be helpful for the definition of an adequate maintenance plan.
References
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Book
Wireless Communications: Principles and Practice
TL;DR: WireWireless Communications: Principles and Practice, Second Edition is the definitive modern text for wireless communications technology and system design as discussed by the authors, which covers the fundamental issues impacting all wireless networks and reviews virtually every important new wireless standard and technological development, offering especially comprehensive coverage of the 3G systems and wireless local area networks (WLANs).
Proceedings Article
Wireless communications
TL;DR: This book aims to provide a chronology of key events and individuals involved in the development of microelectronics technology over the past 50 years and some of the individuals involved have been identified and named.
Journal ArticleDOI
Empirical formula for propagation loss in land mobile radio services
TL;DR: An empirical formula for propagation loss is derived from Okumura's report in order to put his propagation prediction method to computational use.
Wireless Communications: Principles and Practice (2nd Edition) by
TL;DR: This leading book on wireless communications offers a wealth of practical information on the implementation realities of wireless communications, from cellular system design to networking, plus world-wide standards, including ETACS, GSM, and PDC.