Results 141 to 150 of about 37,537 (191)
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Ultra-wideband signal detection using photonic signal preprocessing
Digest of the LEOS Summer Topical Meetings, 2005., 2005Photonic time-stretch processor can be used to slow down electrical ultra-wideband waveform before it is captured by an electronic digitizer. Using this technique, a real-time transient digitizer with a record one-tera-sample/sec sampling rate is demonstrated.
null Yan Han, O. Boyraz, B. JaIali
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Ultra-Wideband Signal Propagation Experiments in Liquid Media
IEEE Transactions on Instrumentation and Measurement, 2008Ultra-wideband (UWB) signals exhibit different characteristics upon propagation through matter compared with narrowband signals. The latter keeping a sinusoidal shape during different forms of signal propagation. The behavior of narrowband signals does not apply to UWB signals in many cases.
Shravan Challa +3 more
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Novel Optically Generated Ultra Wideband (UWB) Signals
Optical Fiber Communication Conference and National Fiber Optic Engineers Conference, 2009We describe UWB wireless technology and the regulatory environment that imposes severe power constraints on these signals. We explain how optical pulse shaping can achieve impressive gains in power efficiency.
Leslie A. Rusch, Mohammad Abtahi
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Resolution of ultra-wideband radar signals
IEE Proceedings - Radar, Sonar and Navigation, 1999The paper considers the range resolution of ultra-wideband signals. The situation of targets, adjacent in range, of significantly different amplitude, as in the case of propagation in lossy media, is examined. Several examples, each taken from three general classes of waveform, are examined.
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Timing Ultra-Wideband Signals With Dirty Templates
IEEE Transactions on Communications, 2005Ultra-wideband (UWB) technology for indoor wireless communications promises high data rates with low-complexity transceivers. Rapid timing synchronization constitutes a major challenge in realizing these promises. In this paper, we establish a novel synchronization criterion that we term "timing with dirty templates" (TDT), based on which we develop ...
L. Yang, G.B. Giannakis
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Signal Design for Ultra-wideband Radio
2002Research in the design of ultra-wideband (UWB) radio systems suggests different kinds of signal design criteria. After an introduction to UWB radio, a variety of sequence design problems, motivated by UWB system constraints, will be presented. Design for time-hopping, for spectral flatness, for rapid acquisition, and for multiple access will be ...
Robert A. Scholtz +2 more
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High-Order Signal Processing for Ultra-Wideband Radar Signals
2020Ultra-wideband (UWB) radar and impulse radar can provide new opportunities for information recovery from radar return signal analysis. If the UWB radar echo signal processing task is converted into a “black-box” system identification problem, then high order signal processing can offer increased performance in terms of characterizing radar returns for ...
Vasilis Z. Marmarelis +3 more
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Overcomplete dictionary based ultra-wideband signal detection
IEEE Wireless Communications and Networking Conference, 2006. WCNC 2006., 2006Ultra-wideband (UWB) transmission is a promising technology for future high speed wireless networks. In this paper, we propose a novel signal detection approach with noise suppression for UWB systems. This approach is based on an overcomplete dictionary signal representation and a sparsity-driven optimization algorithm.
null Wei Li, T.A. Gulliver
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Ultra wideband signal propagation in desktop environments
IEEE Conference on Ultra Wideband Systems and Technologies, 2003, 2004Although ultra wideband (UWB) propagation in indoor environments has been intensively studied, there have, as far we know, been no published studies of UWB propagation in desktop environments, where wireless personal area networks are expected to be most commonly employed.
Y. Suzuki, T. Kobayashi
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Next generation RFID using ultra-wideband signaling
2012 IEEE International Conference on Wireless Information Technology and Systems (ICWITS), 2012Radio frequency identification (RFID) is a powerful technology for asset monitoring and tracking and has a vast potential to reduce operating costs for many applications. While conventional narrowband RFID systems have successfully been used in several applications, the challenges posed by their signal characteristics has prevented their widespread use
Faranak Nekoogar, Farid Dowla
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