Results 41 to 50 of about 24,730 (232)
Sensors, 2020 With the rapid development of information and communication technology, the wireless sensor network (WSN) has shown broad application prospects in a growing number of fields. The non-line-of-sight (NLOS) problem is the main challenge to WSN localization,
Long Cheng +3 more
doaj +1 more source
Coverage and Rate Analysis for Unmanned Aerial Vehicle Base Stations with LoS/NLoS Propagation
, 2018 The use of unmanned aerial vehicle base stations (UAV-BSs) as airborne base stations has recently gained great attention. In this paper, we model a network of UAV-BSs as a Poisson point process (PPP) operating at a certain altitude above the ground users.
Alzenad, Mohamed, Yanikomeroglu, Halim
core +1 more source
Non-line-of-sight imaging with arbitrary illumination and detection pattern
Nature Communications, 2023 Non-line-of-sight (NLOS) imaging aims at reconstructing targets obscured from the direct line of sight. Existing NLOS imaging algorithms require dense measurements at regular grid points in a large area of the relay surface, which severely hinders their ...
Xintong Liu +5 more
doaj +1 more source
Non-line-of-sight Node Localization based on Semi-Definite Programming in Wireless Sensor Networks
, 2009 An unknown-position sensor can be localized if there are three or more anchors making time-of-arrival (TOA) measurements of a signal from it. However, the location errors can be very large due to the fact that some of the measurements are from non-line ...
Chen, Hongyang +4 more
core +2 more sources
Characteristic of social and communicative criteria of foreign students adaptation [PDF]
, 2016 Target tracking with ultra-wideband (UWB) signals in indoor environments is a challenging problem due to the presence of multipath and non-line-of-sight conditions (NLOS).
Bakalo, Olha, Бакало, Ольга
core +2 more sources
NLOS Signal Detection Based on Single Orthogonal Dual-Polarized GNSS Antenna
International Journal of Antennas and Propagation, 2017 Nowadays users have a high demand for the accuracy of position and velocity, but errors caused by non-line-of-sight (NLOS) signals cannot be removed effectively. Since the GNSS signal is right-hand circular polarized (RHCP), the axial ratio of the strong
Ke Zhang +4 more
doaj +1 more source
IEEE Access, 2019 We present robust range-based localization algorithms for which range measurements are used to estimate the location parameter. Non-line-of-sight (NLOS) propagation of signal can deteriorate the estimation performance severely in the indoor and crowded ...
Chee-Hyun Park, Joon-Hyuk Chang
doaj +1 more source
Uplink performance analysis of dense cellular networks with LoS and NLoS transmissions [PDF]
, 2016 © 2016 IEEE. In this paper, we analyse the coverage probability and the area spectral efficiency (ASE) in the uplink (UL) of dense small cell networks (SCNs) considering a piecewise linear path loss model incorporating both line-of-sight (LoS) and non ...
Ding, M +4 more
core +1 more source
Advanced Science, Volume 13, Issue 7, 3 February 2026.This paper presents a programmable metasurface‐based Meta Key Distribution (MKD) system for secure, protocol‐independent key exchange in indoor wireless settings. By embedding entropy into the wireless channel, it enables lightweight, compatible cryptographic key generation.
Xinyu Li +7 more
wiley +1 more source
Non-Line-of-Sight Moving Target Detection Method Based on Noise Suppression
Remote Sensing, 2022 At the present time, most of existing security systems only detect and track targets in line-of-sight (LOS). However, in practice, the locations of targets are often out of the line of sight.
Yilin Wei +3 more
doaj +1 more source