Results 71 to 80 of about 50,977 (262)

Spatial-Variant Delay-Doppler Imagery of Airborne Wide-Beam Radar Altimeter for Contour Extraction of Undulating Terrain

Remote Sensing
Synthetic aperture radar altimeter (SARAL) directs the radar beam toward the nadir point of the flight trajectory. It is capable of capturing elevation variations in the terrain of interest. To ensure that the nadir point remains within the beam coverage
Yanxi Lu, Shize Yu, Yao Wang, Fang Li, Longlong Tan, Bo Huang, Ge Jiang, Gaozheng Liu, Lei Yang   +8 more
doaj   +1 more source

Time‐domain and frequency‐domain exponential ambiguity functions and their application in joint estimation of delay and Doppler shift

IET Radar, Sonar & Navigation, 2022
The classical ambiguity function (AF) in radar signal processing often has a low and fixed resolution in the presence of adjacent multi‐targets. The frequency‐domain exponential ambiguity function (FEAF) was previously presented with a variable exponent ...
Lubo Liu, Yuandong Ji, Lu Zhang
doaj   +1 more source

Profuse Channel Estimation and Signal Detection Techniques for Orthogonal Time Frequency Space in 6G Epoch: A Survey

IEEE Access, 2023
Orthogonal time frequency space (OTFS) modulation is a booming multicarrier modulation technique and a promising candidate for achieving quality of services in high mobility scenarios of 5G new radio (NR) and beyond wireless communication systems.
Sundaresan Sabapathy, Jefrin Sharmitha Prabhu, Surendar Maruthu, Dushantha Nalin K. Jayakody   +3 more
doaj   +1 more source

Cardiac remodeling and arrhythmia in a mouse model of Depdc5 haploinsufficiency

Epilepsia, EarlyView.
Abstract Objective Some ion channel genes linked to developmental and epileptic encephalopathy (DEE) are also linked to cardiac arrhythmia, leading to the hypothesis that predisposition to cardiac arrhythmias may contribute to the complex disease presentation of DEE and possibly to the mechanism of sudden unexpected death in epilepsy.
Roberto Ramos‐Mondragon, Shuyun Wang, Qinghua Liu, Chunling Chen, Alexander M. Greiner, Abigail M. Marx, Maya Shih, Jack M. Parent, Barry London, Lori L. Isom   +9 more
wiley   +1 more source

Pilot-Based Iterative Path Estimation and Maximum Ratio Combining (MRC)–Based Signal Detection of Orthogonal Time–Frequency Space (OTFS) Modulation for 6G in Fractional Doppler Channels

Journal of Computer Networks and Communications
The sixth generation (6G) wireless networks are used to provide a large coverage, and also this generation needed to support different emerging applications in harsh areas with higher user equipment mobility.
Ephrem Gelamite Demere, Zelalem Hailu Gebeyehu   +1 more
doaj   +1 more source

GNSS signal acquisition in the presence of sign transitions [PDF]

, 2009
The next generation of Global Navigation Satellite Systems (GNSS), such as Galileo [1] and GPS modernization [2], will use signals with equal code and bit periods, which will introduce a potential sign transition in each segment of the signal processed ...
Fantino, Maurizio, Kewen Sun, Lo Presti, Letizia   +2 more
core  

Diversity gain for DVB-H by using transmitter/receiver cyclic delay diversity [PDF]

, 2006
The objective of this paper is to investigate different diversity techniques for broadcast networks that will minimize the complexity and improve received SNR of broadcast systems.
Bard, M, Cosmas, J, Song, Y H, Zhang, Y
core   +2 more sources

Research progress on the use of the optical coherence tomography system for the diagnosis and treatment of central nervous system tumors

Ibrain, Volume 11, Issue 1, Page 3-18, Spring 2025.
With the advantages of high‐resolution imaging, efficient image acquisition, intraoperative real‐time detection, and radiation‐free and noninvasive characteristics, optical coherence tomography (OCT) provides accurate diagnosis and effective intraoperative guidance for the minimally invasive diagnosis and treatment of central nervous system (CNS ...
Jiuhong Li, Ziba Ayi, Gonggong Lu, Haibo Rao, Feilong Yang, Jing Li, Jiachen Sun, Junlin Lu, Xulin Hu, Si Zhang, Xuhui Hui   +10 more
wiley   +1 more source

Unified Framework and Comparative Analysis of Delay-Doppler Communication Systems

IEEE Open Journal of the Communications Society
Delay-Doppler (DD) system translates a time-varying channel into quasi-static time invariant channel by modulating the information in DD domain. This serves as a core principle behind orthogonal time frequency space (OTFS) and orthogonal delay Doppler ...
Sangeeta Nalluru, Kuntal Deka, Sanjeev Sharma, A. Rajesh   +3 more
doaj   +1 more source

Pelvic venous disorders in women: Diagnosis and management for gynecologists

International Journal of Gynecology &Obstetrics, EarlyView.
Abstract Pelvic venous disorders (PeVD) are an underrecognized yet significant cause of chronic pelvic pain (CPP) in reproductive‐aged women, characterized by venous reflux, obstruction, or both. This clinical opinion provides a practical overview of PeVD for gynecologists, outlining its pathophysiology, common presentations, diagnostic approach, and ...
Tiffany Ni, Inbar Friedman, Jessica Smith, Brian Liu, Mary Melchior, Andrew D. Brown   +5 more
wiley   +1 more source