Results 131 to 140 of about 37,537 (191)

Ultra-Wideband and Adaptive Photonic Signal Processing of Microwave Signals

IEEE Journal of Quantum Electronics, 2016
Microwave photonic techniques are attractive for processing high bandwidth signals, overcoming inherent electronic limitations. These processors provide new capabilities for realizing adaptive processing over extremely wide microwave frequency ranges, ultra-wideband operation, and electromagnetic interference immunity.
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Fractal ultra-wideband signals

2004 Second International Workshop Ultrawideband and Ultrashort Impulse Signals (IEEE Cat. No.04EX925), 2005
The fractal ultra-wideband (FUWB) signals as a new type of the ultra-wideband (UWB) signals for application in different branches of science and engineering in particular for near-to-Earth space investigations are proposed. Different characteristics of new analytical and numerical models of FUWB signals with using of the Fourier-and wavelet analysis ...
L.F. Chernogor, O.V. Lazorenko
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Robust Ultra-Wideband Signal Acquisition

IEEE Transactions on Wireless Communications, 2008
Ultra-wideband (UWB) communication is envisaged to be deployed in indoor environments, where the noise distribution is decidedly non-Gaussian. A critical challenge for impulse radio UWB is the synchronization of nanosecond-long pulses. In this paper, we propose two acquisition schemes which are robust to uncertainties in the noise distribution and ...
Ersen Ekrem, Mutlu Koca, Hakan Delic
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Rapid ultra-wideband signal acquisition

2004 IEEE Wireless Communications and Networking Conference (IEEE Cat. No.04TH8733), 2004
Low transmission power and a highly spread bandwidth makes the acquisition of ultra-wideband (UWB) signals a difficult problem. In a packet-based network employing UWB modulation in the physical layer, long preambles need to be prepended to each packet because the low signal power requires the receiver to process the signal for long periods of time in ...
S. Aedudodla, S. Vijayakumaran, T.F. Wong   +2 more
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The ultra-wideband signal propagation

The 2004 47th Midwest Symposium on Circuits and Systems, 2004. MWSCAS '04., 2004
In the ultra-wideband (UWB) system the pulses are transmitted at a very low level, where the signal looks like low level noise to the other wireless system. Therefore, a good understanding of the UWB signal propagation is necessary. Moreover, UWB communications rely on an unusual wireless technology (a carrier free and huge bandwidth), so that ...
K.Y. Yazdandoost, R. Kohno
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Sampling architectures for ultra-wideband signals

2017 International Conference on Sampling Theory and Applications (SampTA), 2017
Ultra-wideband (UWB) signal processing is a technology that has tremendous potential to develop advances in communication and information technology. However, it also presents challenges to the signal processing community, and, in particular, to sampling theory.
Stephen D. Casey, Howard S. Cohl
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Features of ultra-wideband signals' radiation

2002 IEEE Conference on Ultra Wideband Systems and Technologies (IEEE Cat. No.02EX580), 2003
The radiation of short duration signals (or ultrawideband- UWB -signals) is significantly different from the long duration narrowband signals (as shown in a table). The paper analyzed the processes in linear antennas and gives a physical interpretation of these differences.
I.I. Immoreev, P.G.S.A.N. Sinyavin
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Photonic processing of ultra-wideband signals

2015 IEEE Summer Topicals Meeting Series (SUM), 2015
We examine how and where nonlinear optical phenomena has and could have impact on wideband signal processing. The emphasis here is on analog microwave signals within antenna systems and suitable for over-air transmission.
R. D. Esman, A. S. Lenihan
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Ultra wideband signals spectral analysis

2010 5th International Confernce on Ultrawideband and Ultrashort Impulse Signals, 2010
The representation and convergence problems of trigonometric and orthogonal Fourier theory are considered. The application peculiarities of classical spectral analysis to the case of ultra wideband signals and completed signals spectrum are discussed. Some conditions which restrict spectral methods application are pointed out.
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