Results 111 to 120 of about 50,507 (245)

Performance of wideband CDMA using space-time spreading over multipath Nakagami fading channels

, 2002
In this contribution the performance of wideband code-division multiple-access (W-CDMA) systems using spacetime spreading (STS) based transmit diversity is investigated, when frequency-selective Nakagami-$m$ fading channels, multiuser interference and ...
Yang, L-L., Hanzo, L.
core   +1 more source

Robust Machine Learning–Based Ionospheric Delay Grid Modeling for PPP‐RTK Under Sparse Reference Stations and Severe Geomagnetic Disturbance

Space Weather, Volume 24, Issue 9, September 2026.
Abstract Sparse reference station networks and severe geomagnetic disturbances can significantly degrade the accuracy of regional ionospheric delay modeling at the network side, thereby reducing the positioning performance of PPP‐RTK. To address this issue, this study proposes a machine learning‐based ionospheric delay grid modeling method that finely ...
Linyu He, Weiping Jiang, Hua Chen, Xingyu Zhou, Tianjun Liu, Jie He, Jie Ding   +6 more
wiley   +1 more source

Noise immunity of a binary phase modulated signal demodulator with adaptive configuration change of decision boundaries in a multipath channel

Омский научный вестник
The article considers the possibilities of a coherent phase-modulated binary signal demodulator in a multipath channel with adaptive rotation of a signal constellation.
G. M. Sidelnikov
doaj   +1 more source

The High‐Latitude Workbox for the Ionosphere (HAWK‐I): A New Toolkit for Real‐Time Specification of the Arctic Ionosphere

Space Weather, Volume 24, Issue 9, September 2026.
Abstract The high‐latitude ionosphere exhibits rapid spatial and temporal variability during geomagnetically active periods, creating persistent challenges for accurate nowcasts. The High‐latitude Workbox for the Ionosphere (HAWK‐I) is a real‐time ionosphere nowcast and specification system designed for operational deployment to address these ...
Patrick Dandenault, Clayton Cantrall, Robert Schaefer, Sebastijan Mrak, Giuseppe Romeo, Lisa Knowles, Cathryn Mitchell, Gary Bust   +7 more
wiley   +1 more source

Robust Navigation in Multipath Environments Using GNSS/UWB/INS Integration with Anchor Position Estimation Toward eVTOL Operations

Sensors
Emerging technologies such as urban air mobility and autonomous vehicles increasingly rely on Global Navigation Satellite Systems (GNSS) for accurate positioning.
Atsushi Osaka, Toshiaki Tsujii
doaj   +1 more source

Long‐Lived Equatorial Plasma Bubbles Persisting Into the Afternoon Over the Pacific Sector During the Recovery Phase of the April 2023 Geomagnetic Storm

Space Weather, Volume 24, Issue 9, September 2026.
Abstract Equatorial plasma bubbles (EPBs) are typically nighttime ionospheric irregularities, and their persistence into daytime sectors remains insufficiently understood. Here, we investigate long‐lived EPB‐related plasma depletion structures over the Pacific sector during the recovery phase of the 23–25 April 2023 geomagnetic storm using Formosa ...
Hailun Ye, Wen Yi, Jianfei Wu, Bingkun Yu, Penghao Tian, Xianghui Xue, Yajun Zhu, Jianyuan Wang, Jianyong Lu, Jian Li, Chong Wang, Tingdi Chen, Xiankang Dou   +12 more
wiley   +1 more source

Multipath selection for resilient network routing [PDF]

In this dissertation we study the routing problem for multi-commodity survivable network ows, with splittable demands, and propose end-to-end path-based solutions where maximum link utilization is minimized, in order to improve resilience in ...
Kazmi, Nayyar A.
core  

Detecting changes in along-path HF propagation during the April 2024 total solar eclipse with radio amateurs and low-cost instrumentation

Frontiers in Astronomy and Space Sciences
The total solar eclipse of April 8, 2024 presented a uniquely favorable circumstance for radio science. The Moon’s shadow passed near Canadian time standard station CHU, which transmits in the high frequency (HF, i.e., 3–30 MHz) band.
Maris Usis, Adam Goodman, Laura Schwartz, Laura Schwartz, David Kazdan, Kristina Collins, Kristina Collins, John Gibbons, Shashank Sastry, Lucy Ayres, Christopher Brault, Seth Byas, Michael Dompke, Michelle Dowell, Rowan Eggert, Aras Erdag, James Ervin, Dave Goodwin, Scarlett Nelson, Stephen Nichols, Olivia Tulgetske, Christian Zorman   +21 more
doaj   +1 more source

Comparative Analysis of Urban Flood Mapping Using Sentinel‐1 SAR Imagery and Machine Learning

Journal of Flood Risk Management, Volume 19, Issue 3, September 2026.
ABSTRACT Flood mapping using remote sensing data has the potential to play a crucial role in monitoring and assessing flood events, particularly in urban environments, where complex infrastructure creates significant challenges. While Synthetic Aperture Radar (SAR) has promising potential for flood mapping, current methods struggle in the urban ...
Md Abdullah Al Mehedi, Virginia Smith, Peleg Kremer   +2 more
wiley   +1 more source

Harnessing Human Mobility Data for Applied Economic Research: Current Knowledge, Challenges, and Emerging Opportunities

Journal of Economic Surveys, Volume 40, Issue 4, Page 1763-1788, September 2026.
ABSTRACT This paper reviews how large‐scale mobility data can enhance economic analyses, highlighting its contributions to understanding travel behavior, labor markets, social interactions, and health outcomes. We discuss its advantages over traditional mobility data sources, which include real‐time location information and fine spatial resolution ...
Cristina Connolly, Sandro Steinbach, Mike Vo, Xibo Wan   +3 more
wiley   +1 more source