Results 21 to 30 of about 4,177,989 (299)
A family of spatial biodiversity measures based on graphs [PDF]
, 2012 While much research in ecology has focused on spatially explicit modelling as well as on measures of biodiversity, the concept of spatial (or local) biodiversity has been discussed very little.
Rajala, T +3 more
core +1 more source
IEEE Access, 2023 Reconfigurable intelligent surface (RIS) is regarded as one of the main enablers in the context of 6G wireless communications. It converts the conventionally uncontrolled wireless channel into a programmed channel.
Mostafa M. Elsherbini +2 more
doaj +1 more source
The regional spatial diversity of housing prices and market activity – evidence from Poland
Acta Scientiarum Polonorum. Administratio Locorum, 2021 The aim of this study is to identify the factors that significantly determine the regional spatial differentiation of housing prices as well as housing market activity in Poland.
Radosław Cellmer +2 more
doaj +1 more source
Modeling and Spatial Diversity-Based Receiving Improvement of In-Flight UAV FSO Communication Links
Applied Sciences, 2021 An in-flight unmanned aerial vehicle (UAV) free-space optical (FSO) communication channel model is proposed by considering the beam deviation of the UAV under different motion states and the phase distortion caused by atmospheric turbulences.
Anrui Zheng, Yang Huang, Shiming Gao
doaj +1 more source
Spatial Diversity in Molecular Communications
CoRR, 2017 In this work, spatial diversity techniques in the area of multiple-input multiple-output (MIMO) diffusion-based molecular communications (DBMC) are investigated. For transmitter-side spatial coding, Alamouti-type coding and repetition MIMO coding are proposed and analyzed.
Martin Damrath +3 more
openaire +2 more sources
A Novel Device-Free Counting Method Based on Channel Status Information
Sensors, 2018 Crowd counting is of significant importance for numerous applications, e.g., urban security, intelligent surveillance and crowd management. Existing crowd counting methods typically require specialized hardware deployment and strict operating conditions,
Junhuai Li +4 more
doaj +1 more source
IEEE Access, 2021 A joint multiple-input multiple-output (MIMO) processing framework is proposed to exploit spatial diversity and moving cues for the enhancement of target detection in a shallow ocean environment. Orthogonal signals are transmitted to illuminate different
Huangyu Dai +4 more
doaj +1 more source
IEEE Access, 2020 Due to the effect of atmospheric turbulence, the transmission reliability and physical-layer security of free space optical (FSO) communication system are facing many challenges.
Jianhua Ji +6 more
doaj +1 more source
Dual-Band Multiple-Element MIMO Antenna System for Next-Generation Smartphones
Applied Sciences, 2022 This work presents a cost-effective multiple-element multiple-input multiple-output (MIMO) antenna system for next-generation smartphones. The proposed antenna system is developed on a 0.8 mm thin FR-4 substrate with a relative permittivity of 4.4, which
Saad Hassan Kiani +5 more
doaj +1 more source
Species richness-environment relationships of European arthropods at two spatial grains: habitats and countries [PDF]
, 2012 We study how species richness of arthropods relates to theories concerning net primary productivity, ambient energy, water-energy dynamics and spatial environmental heterogeneity.
Xavier Espadaler +32 more
core +2 more sources