Results 161 to 170 of about 17,373 (186)
Some of the next articles are maybe not open access.
Kriging estimator for mobile station positioning under non-line-of-sight (NLOS) conditions
2007 International Conference on Communications, Circuits and Systems, 2007Estimation of mobile station location is made difficult by nonsymmetric contamination of measured data caused by NLOS propagation effects. In this paper, a novel algorithm based on kriging method is proposed to reduce the effects of NLOS propagation on the location error. Simulation results show that the proposed algorithm clearly outperforms two other
J.Y. Huang, Z.X. Chen, Q. Wan, W.L. Yang
openaire +1 more source
Entangled and non-line-of-sight (NLOS) free-space photon quantum communication [Invited]
Journal of Optical Networking, 2005Feature Issue on Optical Wireless Communications (OWC) We present new quantum communication (QC) schemes suitable for free-space (wireless) QC implementation. In particular, we present several entangled QC schemes and propose non-line-of-sight (NLOS) free-space photon QC.
Ronald E. Meyers, Keith S. Deacon
openaire +1 more source
OCEANS'11 MTS/IEEE KONA, 2011
Presented are experimental measurements comparing the frequency (i.e. - impulse) response (up to 1GHz) for an underwater optical communications channel as a function of water clarity using collimated or diffuse laser light. The measurement technique used is adapted from a previously reported method used for measuring the channel response of collimated ...
Brandon Cochenour, Linda Mullen
openaire +1 more source
Presented are experimental measurements comparing the frequency (i.e. - impulse) response (up to 1GHz) for an underwater optical communications channel as a function of water clarity using collimated or diffuse laser light. The measurement technique used is adapted from a previously reported method used for measuring the channel response of collimated ...
Brandon Cochenour, Linda Mullen
openaire +1 more source
Characterization of non-line-of-sight (NLOS) bias via analysis of clutter topology
Proceedings of the 2012 IEEE/ION Position, Location and Navigation Symposium, 2012Clutter-prone environments are challenging for range-based localization, where distances between anchors and the unlocalised node are estimated using wireless technologies like radio, ultrasound, etc. This is so due to the incidence of Non-Line-Of-Sight (NLOS) distance measurements as the direct path between the two is occluded by the presence of ...
Muzammil Hussain +3 more
openaire +1 more source
A cooperative multi-hop location verification for Non Line Of Sight (NLOS) in VANET
2011 IEEE Wireless Communications and Networking Conference, 2011Localization and exchanged position information plays a big role in Vehicular Ad-Hoc Networks (VANET). Several network services and applications, such as safety messages, require location information. The data are exchanged between vehicles within their radio communication range.
Osama Abumansoor, Azzedine Boukerche
openaire +1 more source
Detection methodologies to overcome Non line of Sight (NLOS) in Adhoc Networks: A Survey
2019 International Conference on Computer Communication and Informatics (ICCCI), 2019In Vehicular Ad-hoc networks (VANETs) one of the pioneer applications is exchange of emergency messages to identify the location information of the emergency and nonemergency vehicles. But, the presence of obstacles like building infrastructure, trucks and other environmental factors can create Non Line Of Sight (NLOS) which prevents the direct ...
R. Kaviarasan, A. Amuthan
openaire +1 more source
Mobile phone Camera Based Visible Light Communication Using Non-Line-of-Sight (NLOS) Link
2018 International Conference on Network Infrastructure and Digital Content (IC-NIDC), 2018Traditional mobile phone camera based visible light communication (VLC) mainly uses line-of-sight (LOS) link, whose performance will be seriously affected by the blooming effect of complementary metal-oxide-semiconductor (CMOS) camera. In this paper, we introduce a mobile phone camera based VLC using non-line-of-sight (NLOS) link. By using our proposed
Zhenshan Zhang +4 more
openaire +1 more source
A simulation model of back-projection based non-line-of-sight imaging (NLOS) for resolution analysis
International Conference on Signal Image Processing and Communication (ICSIPC 2021), 2021The problem to image around a corner for objects that are invisible from direct line-of-sight is intriguing as its solution may provide the basis for new methods in various fields. However, most current researches are based on back-projectionrelated methods, of which a quantitative analysis of resolution is missing.
openaire +1 more source
A TOA-based location algorithm reducing the errors due to non-line-of-sight (NLOS) propagation
IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211), 2002An effective location algorithm, which considers non-line-of-sight (NLOS) propagation, is presented. By using a new variable to replace the square term and adding the loose variable, the problem becomes a mathematical programming problem, and then the NLOS propagation's effect can be evaluated.
null Xin Wang +2 more
openaire +1 more source
Non-Line-Of-Sight (NLOS) Ultraviolet And Indoor Free-Space Optical (FSO) Communications
2014This chapter presents a new concept for exploiting non-line-of-sight (NLOS) free-space optical (FSO) communication. NLOS configuration can be achieved using scattering as a vehicle for a viable link, or using multipath propagation as in an indoor optical communication link.
openaire +1 more source