Results 231 to 240 of about 362,427 (261)

RF Reference Signal Transport by Optical Fibers

IEEE Transactions on Communications, 1980
Among the various applications of optical fibers, the transmission of time or frequency reference signals seems to have some interest in view of the immunity of the fibers from electromagnetic disturbances. An analysis of the possible causes of phase fluctuation in a link and a feasibility test for the transmission of a local oscillator signal in a ...
Brenci M, Checcacci PF
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Reference Datasets for Training and Evaluating RF Signal Detection and Classification Models

2019 IEEE Globecom Workshops (GC Wkshps), 2019
There are several potential uses of artificial intelligence (AI) and machine learning (ML) in next-generation shared spectrum systems. However, while recognized datasets exist in certain domains such as speech, handwriting and object recognition, there are no equivalent robust and comprehensive datasets in the wireless communications and radio ...
Timothy A. Hall, Raied Caromi, Michael Souryal, Adam Wunderlich   +3 more
openaire   +1 more source

Phase-stable fiber optic systems for reference RF signals

SPIE Proceedings, 1994
Transmission of reference frequency signals over the distance from hundred to thousand meters is necessary for different extended systems, for instance, in radioastronomy radiolocation and other fields . And transmission line is required not to bring out phase fluctuations in signal.
Oleg I. Kotov, Leonid B. Liokumovich, Vladimir M. Nikolaev   +2 more
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Phase stabilized RF reference signal dissemination over optical fiber employing instantaneous frequency control by VCO

2012 IEEE/MTT-S International Microwave Symposium Digest, 2012
Stable microwave reference signal transfer systems are required in communication systems, very long baseline interferometer (VLBI) radio astronomy applications, particle accelerators and metrologies. Radio over fiber (RoF) technique is one of candidates which realize precise microwave dissemination without degradation of stability.
Tomohiro Akiyama, Hirofumi Matsuzawa, Eisuke Haraguchi, Toshiyuki Ando, Yoshihito Hirano   +4 more
openaire   +1 more source

Operation and calibration of VNA-based large signal RF I-V waveform measurements system without using a harmonic phase reference standard

81st ARFTG Microwave Measurement Conference, 2013
A new approach is presented that allows a Vector Network Analyzer to be operated as a Large Signal Network Analyzer without the need for a harmonic phase reference generator. The mode of operation exploits the architecture of a Rohde and Schwarz ZVA-67, which incorporates internal signal and local oscillator sources based on direct digital synthesis [1]
A. Aldoumani, P.J. Tasker, R.S. Saini, J.W. Bell, Tudor Williams, J. Lees   +5 more
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Transmission of Reference RF Signals Through Optical Fiber at XFEL/SPring-8

2010
Proceedings of the 1st International Particle Accelerator Conference, IPAC2010, Kyoto ...
Ohshima, Takashi, Hosoda, Naoyasu, Maesaka, Hirokazu, Matsubara, Shin-Ichi, Otake, Yuji   +4 more
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Experimental Validation of an RF‐Over‐Fiber Reference Signal for Frequency Conversion in Large Multi‐Tile Electronically Scanned Antennas

Microwave and Optical Technology Letters
ABSTRACTIn this article, a phase‐stable RF‐over‐Fiber (RFoF) link for PLL reference signal distribution and frequency conversion over an X‐band active electronically scanned antenna (AESA) made of multiple subarrays is studied. This RFoF scheme is proposed as an alternative to the traditional coaxial cable approach to provide easier integration in ...
Aurélien Ayissi Manga, Karolis Balskus, Guillaume Gastebois, Florian Emaury, Javier Roldan, Alain Karas   +5 more
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TG32 - An accurate RF reference signal for testing power measuring instruments

2017
Power is a fundamental quantity in radio and microwave frequency systems, so it is important to measure it properly. Measuring instruments, such as power sensors, spectrum analysers, measurement receivers, etc, need to be calibrated using an accurately known reference signal.
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