Results 151 to 160 of about 37,537 (191)

Antenna array synthesis for ultra-wideband signals

2013 IEEE Antennas and Propagation Society International Symposium (APSURSI), 2013
Acquisition of ultra-wideband signals by array antennas requires frequency-invariant radiation characteristics over the bandwidth of the signal in order to minimize distortions. In this study, a new synthesis technique of array antennas for radiating nanosecond pulse signals is presented.
Hamad Alsawaha, Ahmad Safaai-Jazi
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Ultra Wideband Signal Sources for Interference Measurements

2005 IEEE International Conference on Ultra-Wideband, 2006
Two prototype ultra wideband (UWB) signal sources using the burst CW concept to generate the UWB pulses have been developed and tested. The sources can be used for testing the possibility of interference to communications equipment by UWB signals. The first source has variable pulse width and pulse repetition frequency as well as a variable centre ...
D. Ball, P. Charlebois, W. Lauber
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Compressed Sensing in Soil Ultra-Wideband Signals

2019
This paper investigated the compressed sensing (CS) of ultra-wideband (UWB) soil echo signals. When CS is used in the transmission of UWB signals, sampling rate can be effectively reduced and sparse signals can be reconstructed from fewer observations. Therefore, how to apply CS into UWB soil echo signals is of great importance.
Chenkai Zhao, Jing Liang
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Rapid acquisition of ultra-wideband radio signals

Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002., 2003
Impulse radio provides many promising features for wireless communications in a dense multipath environment. However, a number of these features result from the enormous effective processing gain, which can make acquisition difficult at the receiver.
Zhang, HL, Wei, SQ, Goeckel, DL, Win, MZ
openaire   +2 more sources

Ultra-Wideband Signals in the Infrasonic Frequency Band

2020 IEEE Ukrainian Microwave Week (UkrMW), 2020
The Chelyabinsk, Romanian, and Kamchatka meteoroids entries into the atmosphere and explosions, which occurred at the military ammunition depots near the towns of Kalynivka and Ichnya in Ukraine, generated ultra-wideband infrasonic signals that has been analyzed employing the system spectral analysis. Here we present the results.
Leonid F. Chernogor, Oleksandr I. Liashchuk, Mykyta B. Shevelev   +2 more
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Space-Time Representation of Ultra Wideband Signals

1998
Publisher Summary This chapter presents some analytic techniques and wave solutions, which are relevant to the analysis of ultra wideband short-pulse fields and data. To convey the ideas in the simplest format, the simple problem of short-pulse radiation from an aperture distribution is considered.
Ehud Heyman, Timor Melamed
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Weighted energy detection of ultra-wideband signals

IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005., 2005
Non-coherent energy detectors are motivated for ultra-wideband (UWB) impulse radios with simple circuitry. A major performance-degrading factor in energy detection is the noise floor, which is aggravated in low-duty-cycle UWB signals with a large bandwidth-time product.
null Zhi Tian, B.M. Sadler
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Coherent processing of ultra-wideband radar signals

IEE Proceedings - Radar, Sonar and Navigation, 1994
An ultra-wideband radar (UWB radar) is defined as a radar with a large fractional bandwidth (typically, 100%) as opposed to a conventional radar which has small fractional bandwidth (typically much less than 5%). Clarification is given of issues surrounding use of ultra-wideband signals in a coherent surveillance radar and processing algorithms are ...
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Compressive sampling based differential detection of ultra wideband signals

21st Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, 2010
In this paper we focus on compressive sampling (CS) based ultra wideband (UWB) differential detection. We formulate an optimization problem to jointly recover the sparse received UWB signals as well as the differentially encoded data symbol. We utilize an alternating direction method of multipliers (ADMoM) to solve this joint optimization problem.
GISHKORI S, LEUS G, LOTTICI, VINCENZO
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Ultra-wideband travelling-wave photodetectors for THz signal generation

The 17th Annual Meeting of the IEEELasers and Electro-Optics Society, 2004. LEOS 2004., 2004
The paper reviews the state-of-the-art in photonic THz oscillators and compares this new technique with existing electrical and optical approaches.
Stöhr, Andreas, Jäger, Dieter
openaire   +1 more source