Results 141 to 150 of about 136,581 (191)
Some of the next articles are maybe not open access.
Propagation model for non-line-of-sight ultraviolet communication
SPIE Proceedings, 2013Scattering deflects the ultraviolet ray, and makes it possible to bypass the obstacles between two blocked nodes. To investigate the channel characteristics of this kind of link, models have been developed, and most of them are based on coplanar geometry. Non-coplanar geometry, however, is unavoidable in most actual application.
Yi-xue Luo, Xin-yi Tang
openaire +1 more source
Non-line-of-sight single-scatter propagation model
Journal of the Optical Society of America A, 1991A propagation model that describes the temporal characteristics of singly scattered radiation in a homogeneous scattering and absorbing medium is presented. The model generalizes previous results in the area and is used to analyze the angular spectrum of singly scattered energy as well as the impulse-response durations and path losses of short-range ...
Mark R. Luettgen +2 more
openaire +1 more source
Non-line-of-sight single-scatter propagation model for noncoplanar geometries
Journal of the Optical Society of America A, 2011In this paper, a geometrical propagation model is developed that generalizes the classical single-scatter model under the assumption of first-order scattering and non-line-of-sight (NLOS) communication. The generalized model considers the case of a noncoplanar geometry, where it overcomes the restriction that the transmitter and the receiver cone axes ...
Mohamed A, Elshimy, Steve, Hranilovic
openaire +2 more sources
Minimizing Indoor Localization Errors for Non-Line-of-Sight Propagation
2018 8th International Conference on Localization and GNSS (ICL-GNSS), 2018Indoor Localization becomes more important, as it provides additional context for many applications for example in the Internet of Things (IoT), Time-of-flight measurements, as a basis for distance estimation, are susceptible for non-line-of-sight (NLOS) propagation, resulting in large distance errors.
Mathias Pelka +3 more
openaire +1 more source
Vectorized polarization-sensitive model of non-line-of-sight multiple-scatter propagation
Journal of the Optical Society of America A, 2011The existing Monte-Carlo-based non-line-of-sight (NLOS) multiple-scatter propagation model is extended to include polarization and also vectorized to improve the simulation speed by about 500 times. This model is validated by the noncoplanar single-scatter model; the results show a perfect match.
Hongwei, Yin +5 more
openaire +2 more sources
Localization in wireless sensor networks under non line-of-sight propagation
GLOBECOM '05. IEEE Global Telecommunications Conference, 2005., 2005This paper addresses ranging in indoor quasi-static sensor environments and presents a time-of-arrival (TOA) based ranging algorithm. A statistical model of the multipath channel in the form of the signal return and noise characterization is derived, and utilized to distinguish signal components from noise.
S. Srirangarajan, A.H. Tewfik
openaire +1 more source
Non-line-of-sight ultraviolet single-scatter propagation model in random turbulent medium
Optics Letters, 2013Non-line-of-sight (NLOS) ultraviolet communication (UVC) uses the atmosphere as a propagation medium. In previous literature, various scatter propagation models have been derived based on the premise that atmospheric turbulence was ignored and the atmosphere was considered as a turbid medium, also called random scatterers. In this Letter, a NLOS single-
Houfei, Xiao +4 more
openaire +2 more sources
Closed-form impulse response model of non-line-of-sight single-scatter propagation
Journal of the Optical Society of America A, 2016For optical scattering communication, a closed-form expression of channel impulse response (CIR) is favorable for further system design and channel capacity analysis. Combining the mean value theorem of integrals and L'Hôpital's rule, the exact non-line-of-sight (NLOS) single-scatter propagation model is simplified to a closed-form CIR model for a ...
Yu, Sun, Yafeng, Zhan
openaire +2 more sources
Site-Specific Propagation Prediction for UWB Indoor Non-line-of-sight environment
2007 International Symposium on Electromagnetic Compatibility, 2007A site-specific propagation prediction for UWB impulse signals within indoor non-line-of-sight (NLOS) environment is addressed in this paper. The transmitter and the receiver are placed in two rooms respectively with a concrete wall blocking the line-of-sight (LOS) propagation path.
Wang Yang, Zhang Naitong
openaire +1 more source
Non-line-of-sight propagation measurements at 60GHz for millimeter-waves WPAN
2008 Asia-Pacific Microwave Conference, 2008Propagation measurement campaign at 60 GHz band has been conducted in the laboratory environment for both LOS and NLOS situations. Path loss and delay spread were described as basic propagation characteristics. The parameter of path loss model with shadowing effect was also extracted. The result showed a large delay spread in the specific condition.
H. Sawada +5 more
openaire +1 more source