Results 51 to 60 of about 26,636 (252)

Metasurface‐Enabled Active‐Like Passive Radar

Advanced Science, EarlyView.
A programmable space‐time‐coding metasurface embeds distinct spatiotemporal tags into ambient wireless signals, allowing passive radar to operate in an active‐like manner. By enabling code‐correlated reconstruction under interference, the approach supports robust real‐time UAV tracking in complex environments and points to intelligent, low‐power ...
Mingyi Li, Jiawen Xu, Hanting Zhao, Xu Zhao, Yanjin Chen, Tie Jun Cui, Vincenzo Galdi, Lianlin Li   +7 more
wiley   +1 more source

Frequency domain phase-resolved optical Doppler and Doppler variance tomography [PDF]

, 2004
Frequency domain phase-resolved optical Doppler tomography (ODT) was developed with Doppler variance imaging capability. It is shown that utilizing the frequency domain method, phase-resolved ODT can achieve much higher imaging speed and velocity dynamic
Guo, Shuguang, Li, GP, Chen, Zhongping, Wang, Lei, Wang, Yimin, Bachman, Mark, Zhang, Jun   +6 more
core   +1 more source

Intrinsically Mitochondria‐Targeting Nanozyme via Coordination‐Assembly of Natural Quercetin for Cascade Antioxidant Therapy of Cerebral Ischemia‐Reperfusion Injury

Advanced Science, EarlyView.
This study uncovers that quercetin naturally targets mitochondria. By coordinating quercetin with Fe3+, we engineer an ultrasmall cascade nanozyme (MCN) with superoxide dismutase‐catalase activities. MCN crosses the damaged blood–brain barrier, scavenges mitochondrial ROS, prevents mitochondrial DNA leakage, and blocks the cGAS‐STING pathway, thereby ...
Wenxuan Zheng, Zhicheng Wang, Xin Zhou, Shuya Wang, Xiaojing Shi, Tingli Xiong, Ruishi Li, Yuting Lin, Zhen Chen, Jiawen Wei, Fei Li, Jinwen Ge, Kelong Ai, Chong Liu, Guiming Deng   +14 more
wiley   +1 more source

Time Frequency Localized Pulse for Delay Doppler Domain Data Transmission

2025 IEEE Wireless Communications and Networking Conference (WCNC)
Orthogonal time frequency space (OTFS) is a strong candidate waveform for sixth generation wireless communication networks (6G), which can effectively handle time varying wireless channels. In this paper, we analyze the effect of fractional delay in delay Doppler (DD) domain multiplexing techniques.
Sanoopkumar P. S., Muyiwa Balogun, Liam P. Barry, Arman Farhang   +3 more
openaire   +4 more sources

User-Centric Multi-Dimensional Modulation for Receiver Operational Cost Minimization in Non-Orthogonal Domains

IEEE Open Journal of the Communications Society
The perpetual efforts in supporting ever-growing QoS requirements have brought new challenges in 5G advanced and 6G networks such as increased spatial channel correlation, large delaydoppler spread, higher carrier frequency offset, and more complex multi-
Thakshanth Uthayakumar, Xianbin Wang
doaj   +1 more source

Source Location and Suppression of Phase Induced Intensity Noise in Fiber-Based Continuous-Wave Coherent Doppler Lidar

IEEE Photonics Journal, 2021
The phase induced intensity noise (PIIN) may seriously reduce the signal-to-noise ratio (SNR) of continuous-wave coherent Doppler lidar (CW-CDL), thereby limiting its performance in practical applications.
Zheng Tang, Mengfan Wang, Wei Feng, Xiaoyuan Sun, Benli Yu, Kai Qian, Ping Chen, Guojie Tu   +7 more
doaj   +1 more source

Fractal Analysis of Intraflow Unidirectional Delay over W-LAN and W-WAN Environments [PDF]

, 2007
We have analysed unidirectional delay traces of a diverse set of IPv6 microflows routed over W-LAN and W-WAN environments. Using a number of time-domain and frequency-domain estimators we have examined the existence and intensity of long-range dependence
Pezaros, D., Mathy, Laurent, Laurent Mathy, Sifalakis, M., Mathy, L., Manolis Sifalakis, Dimitrios P. Pezaros, Pezaros, D. P.   +7 more
core   +1 more source

Terahertz Channel Modeling, Estimation and Localization in RIS‐Assisted Systems

Advanced Electronic Materials, EarlyView.
Reconfigurable intelligent surfaces have become a recent intensive research focus. Based on practical applications, channel strategies for RIS‐assisted terahertz wireless communication systems are categorized into three different types: channel modeling, channel estimation, and channel localization.
Hongjing Wang, Weipeng Wang, Xuan Cong, Shiyu Wang, Gao Li, Sen Gong, Lin Huang, Hongxin Zeng, Yaxin Zhang, Ziqiang Yang   +9 more
wiley   +1 more source

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

Processamento de sinais Doppler para obtenção de sonograma em tempo real [PDF]

, 2003
Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia Elétrica.A aterosclerose reduz a luz de vasos sanguíneos, causando isquemia.
Baggio, João Fernando Refosco
core