Results 71 to 80 of about 136,581 (191)

3-D Statistical Channel Model for Millimeter-Wave Outdoor Mobile Broadband Communications

, 2015
This paper presents an omnidirectional spatial and temporal 3-dimensional statistical channel model for 28 GHz dense urban non-line of sight environments.
Rappaport, Theodore S., Samimi, Mathew K.   +1 more
core   +1 more source

Map-Aware Models for Indoor Wireless Localization Systems: An Experimental Study

, 2014
The accuracy of indoor wireless localization systems can be substantially enhanced by map-awareness, i.e., by the knowledge of the map of the environment in which localization signals are acquired.
Montorsi, Francesco, Pancaldi, Fabrizio, Vitetta, Giorgio M.   +2 more
core   +1 more source

Novel Intelligent Methods for Channel Path Classification and Model Determination Based on Blind Source Signals

Atmosphere
In this paper, the urban signal propagation characteristics based on the location of blind sources are investigated. To address the issue of blind electromagnetic radiation sources in complex urban environments, intelligent methods for propagation ...
Li-Feng Cao, Cheng-Guo Liu, Run-Sheng Cheng, Guang-Pu Tang, Tong Xiao, Li-Feng Huang, Hong-Guang Wang   +6 more
doaj   +1 more source

(1+3) Covariant Dynamics of Scalar Perturbations in Braneworlds

, 2002
We discuss the dynamics of linear, scalar perturbations in an almost Friedmann-Robertson-Walker braneworld cosmology of Randall-Sundrum type II using the 1+3 covariant approach. We derive a complete set of frame-independent equations for the total matter
A. Challinor, A. Challinor, A. Challinor, A. Lewis, Anthony Challinor, Anthony Lasenby, Bernard Leong, C. Gordon, C. Ma, C. van de Bruck, C. van de Bruck, D. Gorbunov, D. Langlois, D. Langlois, D. Langlois, D. Langlois, E.J. Copeland, G. Ellis, H. Kodama, H.A. Bridgman, K. Koyama, L. Anchordoqui, L. Randall, M. Bucher, N. Deruelle, P. de Bernardis, P. Dunsby, Peter Dunsby, R. Maartens, R. Maartens, R. Maartens, S. Hanany, S. Mukohyama, T. Shiromizu   +33 more
core   +1 more source

A Machine Learning Approach for Path Loss Prediction Using Combination of Regression and Classification Models

Sensors
One of the key parameters in radio link planning is the propagation path loss. Most of the existing methods for its prediction are not characterized by a good balance between accuracy, generality, and low computational complexity. To address this problem,
Ilia Iliev, Yuliyan Velchev, Peter Z. Petkov, Boncho Bonev, Georgi Iliev, Ivaylo Nachev   +5 more
doaj   +1 more source

Diversity textile antenna systems for firefighters [PDF]

, 2010
Off-body communication systems are valuable to improve the security of rescue workers by allowing them to transmit vital information collected by sensors. As rescue workers often work in indoor environments characterized by many obstructions, non line-of-
Rogier, Hendrik, Vallozzi, Luigi, Van Torre, Patrick, Verhaevert, Jo   +3 more
core  

A Ray-Tracing-Based Single-Site Localization Method for Non-Line-of-Sight Environments

Sensors
Localization accuracy in non-line-of-sight (NLOS) scenarios is often hindered by the complex nature of multipath propagation. Traditional approaches typically focus on NLOS node identification and error mitigation techniques.
Shuo Hu, Lixin Guo, Zhongyu Liu
doaj   +1 more source

Calculation Algorithm for Diffraction Losses of Multiple Obstacles Based on Epstein–Peterson Approach

International Journal of Antennas and Propagation, 2017
Applying propagation models with good accuracy is an essential issue for increasing the capacity and improving the coverage of cellular communication systems.
Ahmad S. Abdulrasool, Jabir S. Aziz, Sadiq J. Abou-Loukh   +2 more
doaj   +1 more source

Reliable Line-Of-Sight And Non-Line-Of-Sight Propagation Channel Identification In Ultra-Wideband Wireless Networks

, 2016
The paper addresses the problem of line-of-sight (LOS) vs. non-line-of-sight (NLOS) propagation link identification in ultra-wideband (UWB) wireless networks, which is necessary for improving the accuracy of radiolocation and positioning applications.
Landolsi, Mohamed Adnan, Almutairi, Ali F.   +1 more
openaire   +1 more source

PROPAGATION IMPAIRMENTS IN 6G COMMUNICATION DUE TO NON-LINE OF SIGHT EFFECTS

Journal of Research in Engineering and Applied Sciences
The emerging sixth-generation (6G) mobile network provides a higher spectrum to users. It uses frequencies between 7 GHz and 3 THz. In such frequencies the effects of propagation impairments on the signal are significant. The present work is focused on analyzing the effects of the environmental factors lying in the line of Sight (NLOS) path between the
openaire   +1 more source