Results 151 to 160 of about 136,581 (191)

Effect of Bidirectional Reflector Technology on the Non-line-of-sight propagation of Light Fidelity System

2021 3rd International Conference on Electronics Representation and Algorithm (ICERA), 2021
Light fidelity is a future technology due to significant advancements in Light-Emitting Diodes (LEDs) and visible-light communication. Existing LEDs for illumination in homes, factories, offices, and streets have large bandwidths, are secure, and exhibit high data rates; hence, LED has recently attracted considerable attention.
Satea H. Alnajjar, Ahmed Majid Hameed
openaire   +1 more source

An evaluation of UWB localization under non line-of-sight (NLOS) propagation

2008 3rd International Symposium on Wireless Pervasive Computing, 2008
In this paper we evaluate the statistical performances of the association of a low-complexity of the time of arrival (TOA) estimation algorithm and the location estimation algorithm in a non line-of-sight (NLOS) indoor environment. For that, we choose the time hopping (TH) code and pulse amplitude modulation (PAM) for ultra wideband (UWB) symbols and ...
Maali, Abdelmadjid, Baudoin, Geneviève, Mesloub, Ammar, Ouldali, Abdelaziz, Mimoun, Hassane   +4 more
openaire   +1 more source

Closed-form path loss model of non-line-of-sight ultraviolet single-scatter propagation

Optics Letters, 2013
Non-line-of-sight ultraviolet propagation models have been developed for both coplanar and noncoplanar geometries. Based on an exact integral-form single-scatter model, this Letter proposes an approximate closed-form model for tractable analysis applicable to noncoplanar geometries with a narrow transmitter beam or receiver field of view.
Yong, Zuo, Houfei, Xiao, Jian, Wu, Wei, Li, Jintong, Lin   +4 more
openaire   +2 more sources

Simplified prediction of propagation loss over non line-of-sight intersections in V2V

2014 International Symposium on Antennas and Propagation Conference Proceedings, 2014
A simplified prediction scheme of averaged propagation loss over an NLOS intersection in V2V is proposed. In the scheme, the propagation loss is calculated by accounting only the dominant paths in the ray-tracing calculation. In this paper, the calculation method is presented and its accuracy is evaluated by comparing the predicted results with those ...
Ippei Sugae, Toshihiro Tango, Hisato Iwai, Hideichi Sasaoka   +3 more
openaire   +1 more source

Performances of Non-Line-of-Sight Ultraviolet Multi-Scatter Propagation for Noncoplanar Geometries

Advanced Materials Research, 2012
A multi-scatter propagation model based on Monte Carlo method is presented. This model can be applied to all the geometries, including coplanar or noncoplanar scenario. The mathematical description of this model is deduced. We obtain the spatial positions of photon with three Cartesian coordinates after each propagation step and the received judgment ...
Yi Nan Tang, Xiao Ping Xie, Wei Zhao
openaire   +1 more source

Scattered Propagation MIMO Channel Model for Non-Line-of-Sight Ultraviolet Optical Transmission

IEEE Photonics Technology Letters, 2017
An inclusive scattered propagation multiple input multiple output (MIMO) channel model prototype is proposed for multiplexed non-line-of-sight ultraviolet (UV) optical transmission to fill up this theory blank. Two key difficulties concerning an MIMO UV channel model are resolved in this letter. In order to verify the feasibility of this channel model,
Heng Qin, Yong Zuo, Feiyu Li, Risheng Cong, Lingchao Meng, Jian Wu   +5 more
openaire   +1 more source

Comparison of Propagation Losses in THz and Optical Non-Line-of-Sight Imaging

2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting, 2019
We investigate the propagation losses in terahertz (THz) non-line-of-sight (NLoS) imaging and compare the performance to the optical counterpart. NLoS imaging exploits the multiple reflections of electromagnetic waves from surrounding surfaces to reconstruct the geometry and location of hidden objects. THz and visible/infrared radiations are attractive
Yiran Cui, Georgios C. Trichopoulos
openaire   +1 more source

Measurements of non line-of-sight VHF propagation over the sea surface

Tenth International Conference on Antennas and Propagation (ICAP), 1997
On two occasions in 1994, a set of trials were carried out to measure the signal strength as a function of the range between three vertically-polarised floating transmitters, operating at frequencies in the VHF band, and a ship-mounted receiver. The trials corresponded to sea states from 2 to 5, and ranges up to 30 Nautical miles (1 Nm=1852 m), beyond ...
openaire   +1 more source

Impact of finite receiver-aperture size in a non-line-of-sight single-scatter propagation model

Journal of the Optical Society of America A, 2011
In this paper, a single-scatter propagation model is developed that expands the classical model by considering a finite receiver-aperture size for non-line-of-sight communication. The expanded model overcomes some of the difficulties with the classical model, most notably, inaccuracies in scenarios with short range and low elevation angle where ...
Mohamed A, Elshimy, Steve, Hranilovic
openaire   +2 more sources

Simulation and analysis of UWB propagation characteristics in the indoor Non-Line-of-Sight environment

2016 IEEE International Conference on Computational Electromagnetics (ICCEM), 2016
In this paper, the propagation characteristics of UWB (Ultra-wideband) signal in the indoor NLOS (Non-Line-of-Sight) environment are discussed based on the time-domain ray tracing method. Propagation characteristics are analyzed by considering of multipath propagation mechanisms including direct ray, reflection and transmission, such as the time-domain
null Shuangde Li, null Yuanjian Liu, null Xiaojun Zhang, null Guanyun Wang   +3 more
openaire   +1 more source