Results 11 to 20 of about 352,858 (282)
Advanced Line-of-Sight (LOS) model for communicating devices in modern indoor environment. [PDF]
PLoS OneThe provision of Wireless Fidelity (Wi-Fi) service in an indoor environment is a crucial task and the decay in signal strength issues arises especially in indoor environments. The Line-of-Sight (LOS) is a path for signal propagation that commonly impedes innumerable indoor objects damage signals and also causes signal fading.
Waqas M +6 more
europepmc +5 more sources
A new approach to diffraction modelling for line-of-sight (LOS) paths [PDF]
2015 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC), 2015 In this paper, we present a new knife-edge diffraction method based on Bullington method for the terrestrial line-of-sight (LOS) paths. The diffraction loss of our new knife-edge diffraction method is compared with the results obtained from the Delta-Bullington method and the measurement data existing in the literature for sample fixed terrestrial ...
Ayhan Altintaş
exaly +3 more sources
A Measurement Based Shadow Fading Model for Vehicle-to-Vehicle Network Simulations
International Journal of Antennas and Propagation, 2015 The vehicle-to-vehicle (V2V) propagation channel has significant implications on the design and performance of novel communication protocols for vehicular ad hoc networks (VANETs).
Taimoor Abbas +3 more
doaj +3 more sources
Closed Form Approximations for UAV Line-of-Sight Probability in Urban Environments
IEEE Access, 2023 This paper presents a new approach to estimate the probability of line-of-sight (LoS) for unmanned aerial vehicle (UAV) communications. We provide lower and upper bounds on the probability of LoS in terms of what we call the first-building-LoS ...
Imran Mohammed +3 more
doaj +3 more sources
Achievable directive antenna gain measurements and modeling for 60 GHz indoor links [PDF]
Scientific ReportsHighly directive antennas may be a key component in millimeter wave links to offset their inherently high path losses. In cluttered scenarios such as Non-Line-Of-Sight (NLOS) indoor settings, antenna gain is degraded by the interaction of the channel ...
Sebastián Bruna +8 more
doaj +2 more sources
An Improved Adaptive Kalman Filter Positioning Method Based on OTFS [PDF]
SensorsTo mitigate the degradation of positioning accuracy in sixth-generation mobile communication systems under dynamic line-of-sight (LOS) and non-line-of-sight (NLOS) conditions, this paper proposes an improved adaptive Kalman filter positioning method ...
Siqi Xia, Aijun Liu, Xiaohu Liang
doaj +2 more sources
The Folded Normal Distribution: A New Model for the Small-Scale Fading in Line-of-Sight (LOS) Condition [PDF]
IEEE Access, 2019 [EN] In this paper, a novel form of the folded normal (FN) distribution has been proposed to model the small-scale fading in wireless communications. From a multiple-input multiple-output (MIMO) measurement campaign conducted in a lab environment with the line-of-sight (LOS) conditions at both the 60 and the 94 GHz bands, the authors obtain the ...
Juan Reig +2 more
exaly +4 more sources
IEEE Transactions on Communications, 2015 Troposcatter can be used as a communication medium for beyond-Line-of-Sight (b-LoS) links. However, available troposcatter channel models do not provide comprehensive channel modeling especially at high frequencies. Therefore, the main motivation of this study is to develop a ray-based MIMO troposcatter channel model to analyze transmission-loss ...
Ergin Dinç, Özgur B Akan
exaly +4 more sources
Channel Characteristics of Dynamic Off-Body Communications at 60 GHz Under Line-of-Sight (LOS) and Non-LOS Conditions [PDF]
IEEE Antennas and Wireless Propagation Letters, 2017 This letter investigates the first-order characteristics of dynamic off-body communications channels at 60 GHz. In particular, we have studied signal propagation from a chest-worn millimeter-wave transmitter as an adult male walked toward and then away from a hypothetical base station.
Seong Ki Yoo +2 more
exaly +4 more sources
Non-Line-of-Sight Identification Based on Unsupervised Machine Learning in Ultra Wideband Systems
IEEE Access, 2019 Identification of line-of-sight (LOS) and non-line-of-sight (NLOS) propagation conditions is very useful in ultra wideband localization systems. In the identification, supervised machine learning is often used, but it requires exorbitant efforts to ...
Jiancun Fan, Ahsan Saleem Awan
doaj +3 more sources