Results 251 to 260 of about 38,067 (289)

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
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +1 more source

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 ...
openaire   +1 more source

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
openaire   +2 more sources

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

Location and Navigation with Ultra-Wideband Signals

2012
Abstract : Existing positioning and navigation applications mainly rely on GNSS. However, its application to indoor, metropolitan and heavy-foliage scenarios is significantly constrained by the satellite visibility, limited accuracy and the intensively frequency-selective channel condition.
John Harris, Liuqing Yang
openaire   +1 more source

Biological information detection using ultra wideband signals

2015 9th International Symposium on Medical Information and Communication Technology (ISMICT), 2015
In this paper, detection of high-precision respiration rate and heart rate, by using low-band ultra wideband (UWB) signal is studied. In order to detect the high-precision biological information, two methods are proposed to reduce the background noise, using pre-measured ambient response without the human body, and evaluated with experiments.
Aya Suzuki, Tetsushi Ikegami
openaire   +1 more source