Results 21 to 30 of about 4,630 (180)
IEEE Access, 2019 The cost functions and their performances of direct position determination (DPD) methods in the presence of multipath propagation are investigated. We first establish a general DPD (GDPD) model in the presence of multi-path propagation and point out that
Jianping Du +4 more
doaj +1 more source
Target Detection in Low Grazing Angle with Adaptive OFDM Radar
International Journal of Antennas and Propagation, 2015 Multipath effect is the main factor of deteriorating target detection performance in low grazing angle scenario, which results from reflections on the ground/sea surface.
Yang Xia +4 more
doaj +1 more source
Empirical Season’s Fadings in Radio Communication at 6 GHz Band
Journal of Telecommunications and Information Technology, 2009 This paper covers unavailability of line-of-sight radio links due to multipath propagation. Multipath fading in the atmosphere is not permanent phenomenon.
Jan Bogucki, Ewa Wielowieyska
doaj +1 more source
Illustrating Multipath Propagation by Means of Sound Waves [PDF]
IEEE Antennas and Propagation Magazine, 2009 A method is presented that uses sound waves to illustrate multipath propagation concepts. This is based on the existing analogy between radio and sound waves, and has the advantage that the required equipment is easily available. Different measurement techniques are introduced to respectively examine time dispersion, time variation, and both aspects of
openaire +2 more sources
Ultra-Wideband Channel Modeling for Intravehicle Environment
EURASIP Journal on Wireless Communications and Networking, 2009 With its fine immunity to multipath fading, ultra-wideband (UWB) is considered to be a potential technique in constructing intravehicle wireless sensor networks.
Talty Timothy, Niu Weihong, Li Jia
doaj +2 more sources
Robust range‐only beacon mapping in multipath environments
ETRI Journal, 2019 This study proposes a robust range‐only beacon mapping method for registering the locations of range‐only beacons automatically. The proposed method deals with the multipath propagation of signals from range‐only beacons using the range‐only measurement ...
Byungjae Park, Sejin Lee
doaj +1 more source
Experimental Analysis of Spatial Modulation Systems in Mixed LOS/NLOS Scenarios
IEEE Access, 2022 Spatial modulation (SM) as a multiple-input multiple-output (MIMO) technique is a solution suitable which offers, with low system complexity and cost, improved spectral efficiency compared to single-input-single-output (SISO) systems.
Yanni Zhou +2 more
doaj +1 more source
Ultrafast Optoacoustics Reveals Intricate 3D Anisotropic Elasticity in Nanocrystalline Membranes
Advanced Science, EarlyView.Ultrafast optoacoustic spectroscopy combined with a Sagnac interferometer enables non‐contact, simultaneous characterization of thickness and the full three‐dimensional anisotropic elastic constants in freestanding nanocrystalline copper membranes. By capturing gigahertz Lamb waves and zero‐group‐velocity resonances followed by SAFE‐GA inversion, the ...
Shuchang Zhang +11 more
wiley +1 more source
Single‐Sensor Vibration Sensing in Anisotropic Composites Enabled by Disordered Metasurfaces
Advanced Science, EarlyView.This work develops a single‐sensor vibration sensing (SSVS) framework that integrates disordered metasurfaces with compressive sensing. Comprehensive numerical and experimental validations demonstrate that, by manipulating anisotropic guided wave propagation through metasurfaces, the proposed SSVS framework enables high‐fidelity multi‐source vibration ...
Jianjie Zhang +6 more
wiley +1 more source
Conformal Reconfigurable Intelligent Surfaces: A Cylindrical Geometry Perspective
Advanced Electronic Materials, EarlyView.Cylindrical reconfigurable intelligent surfaces are explored for low‐complexity beam steering using one‐bit meta‐atoms. A multi‐level modeling approach, including optimization‐based synthesis, demonstrates that even minimal hardware can support directive scattering.
Filippo Pepe +4 more
wiley +1 more source