Results 1 to 10 of about 9,429 (256)

Advanced Line-of-Sight (LOS) model for communicating devices in modern indoor environment. [PDF]

PLoS One
The 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, Abbas Q, Qureshi A, Amin F, de la Torre Díez I, Uc Rios C, Gongora HF.   +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 Altintas
exaly   +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, Swaroop Gopalam, Iain B. Collings, Stephen V. Hanly   +3 more
doaj   +3 more sources

Achievable directive antenna gain measurements and modeling for 60 GHz indoor links [PDF]

Scientific Reports
Highly 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, Mauricio Rodríguez, Rodolfo Feick, Francisco Pizarro, Reinaldo Valenzuela, Jinfeng Du, Dmitry Chizhik, Jakub Sapis, Sergio Chapana   +8 more
doaj   +2 more sources

An Improved Adaptive Kalman Filter Positioning Method Based on OTFS [PDF]

Sensors
To 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

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, Young Jin Chun, Gareth Conway   +2 more
exaly   +4 more sources

LOS Signal Identification Based on Common Chord Intersection Point Position Deviation from MS in Target Localization

Applied Sciences, 2023
Target localization has been a popular research topic in recent years since it is the basis of all kinds of location-based applications. For GNSS-denied urban or indoor environments, the localization method based on time-of-arrival (TOA) is one of the ...
Rui Luo, Hualing Zhao, Ping Deng, Yin Kuang   +3 more
doaj   +1 more source

Alternating Direction Method of Multipliers for TOA-Based Positioning Under Mixed Sparse LOS/NLOS Environments

IEEE Access, 2021
For positioning system based on wireless sensor networks, NLOS errors are one of the main factors to degrade localization performance of an algorithm, about which lots of research results and analysis have been published in previous literatures to ...
Chengwen He, Yunbin Yuan, Bingfeng Tan
doaj   +1 more source

Analysis of 5.8 GHz Network for Line of Sight (LOS) and Non-Line of Sight (NLOS) in Suburban Environment

International Journal on Advanced Science, Engineering and Information Technology, 2023
This paper presents the findings of radio wave characterization based on the measurement data at 5.8 GHz. The measurement data were collected by a testbed channel, which links with the following scenarios: a single tree, a row of trees, a row of trees and a road, a row of trees, a road, and a building.
Md Idris, Ikha Fadzila, Tan, Kim Geok, Abd Rahman, Noor Ziela, Md Idris, Mohd Haffizzi   +3 more
openaire   +2 more sources

Optimum Model for Tracking of Moving Objects

Pakistan Journal of Engineering & Technology, 2023
 In wireless communication, it is a challenge to find the accurate position of moving objects. The presented work proposes the GPS receiver to measure the position and velocity of moving objects.
Muzaffar Hussain, Lubna Farhi, Farhan Ur Rehman   +2 more
doaj   +1 more source