Results 21 to 30 of about 6,147,351 (173)

Influences of Sensor Placement Site and Subject Posture on Measurement of Respiratory Frequency Using Triaxial Accelerometers

Frontiers in Physiology, 2020
IntroductionRespiration frequency (RF) could be derived from the respiratory signals recorded by accelerometers which detect chest wall movements. The optimum direction of acceleration for accurate RF measurement is still uncertain. We aim to investigate
Stephen Hughes, Haipeng Liu, Dingchang Zheng   +2 more
doaj   +1 more source

Improved Phase Stabilization of a Radio-Over-Fiber Link Under Large and Fine Delay Tuning

IEEE Photonics Journal, 2015
In this paper, we propose and demonstrate a phase-stabilized radio-frequency (RF) reference transmission scheme by actively stabilizing the optical path delay of the fiber link.
Feifei Yin, Anxu Zhang, Yitang Dai, Jianqiang Li, Yue Zhou, Jian Dai, Kun Xu   +6 more
doaj   +1 more source

Large-signal compact diode noise modelling strategies for non-autonomous RF nonlinear applications [PDF]

, 2003
We discuss system-oriented approaches to identify large-signal, cyclostationary compact noise models of RF pn diodes based on the modulation of small-signal, stationary noise expressions.
Bonani, Fabrizio, Donati Guerrieri, S., Ghione, Giovanni, Donati Guerrieri, Simona, Ghione, G., Bonani, F.   +5 more
core   +1 more source

Joint Frequency and Time Transfer Over Optical Fiber With High-Precision Delay Variation Measurement Using a Phase-Locked Loop

IEEE Photonics Journal, 2019
We demonstrate a simultaneous frequency and time reference dissemination system over 80 km fiber with a phase-locked loop. The phase fluctuation of the transferred radio-frequency (RF) signal is compensated by adjusting the frequency of the ...
Xiaocheng Wang, Wei Wei, Zhangweiyi Liu, Daming Han, Nan Deng, Lingwei Yang, Weilin Xie, Yi Dong   +7 more
doaj   +1 more source

Statistical Analysis of Handover Process Performance in a Cellular Mobile Network in the City of Quito, Ecuador

Engineering Proceedings, 2023
This paper presents an overview of the findings in the handover (HO) process performance within three routes in Quito, Ecuador. We used the Net-Monitor Software to gather information from one of the three national mobile operators.
Ramiro Espinosa, Pablo Lupera-Morillo, Valdemar Farre, Roberto Maldonado, Ricardo Llugsi Cañar   +4 more
doaj   +1 more source

Design of controlled RF switch for beam steering antenna array [PDF]

, 2008
YesA printed dipole antenna integrated with a duplex RF switch used for mobile base station antenna beam steering is presented. A coplanar waveguide to coplanar strip transition was adopted to feed the printed dipole.
Abd-Alhameed, Raed, Abusitta, M.M., Excell, Peter S., Zhou, Dawei   +3 more
core   +1 more source

Research on the extension method of the main signal source of the synchrotron radiation device

Dianzi Jishu Yingyong
The main signal source is one of the key components of the synchrotron radiation device. It is not only used to generate the highly stable reference signals required by each subsystem of the synchrotron radiation light source, but also used to generate ...
Zhang Kai, Wei Yelong, Chen Qiuju, Wu Congfeng, Pang Jian, Tang Yungai, Du Baiting, Zhang Shancai, Feng Guangyao   +8 more
doaj   +1 more source

Optical Self-Interference Cancellation With Frequency Down-Conversion Based on Cascade Modulator

IEEE Photonics Journal, 2020
A novel approach to simultaneous radiofrequency self-interference cancellation (SIC) and frequency down-conversion in a unified system is proposed and demonstrated experimentally based on cascade Mach–Zehnder modulators (MZM). The local oscillator
Jiaojiao Wang, Yuehui Wang, Zhike Zhang, Zeping Zhao, Jianguo Liu   +4 more
doaj   +1 more source

Phase noise and jitter modeling for fractional-N PLLs [PDF]

Advances in Radio Science, 2007
We present an analytical phase noise model for fractional-N phase-locked loops (PLL) with emphasis on integrated RF synthesizers in the GHz range. The noise of the crystal reference, the voltage-controlled oscillator (VCO), the loop filter, the charge ...
S. A. Osmany, F. Herzel, K. Schmalz, W. Winkler   +3 more
doaj  

Analisis Coverage Planning dan Coverage Prediction di Existing Network eNodeB Jaringan 4G di Daerah Operasional Yogyakarta dan Magelang

Techne, 2018
Untuk meningkatkan kinerja jaringan 4G yang merupakan jaringan uji coba di Yogyakarta dan Magelang  maka harus dilakukan coverage planning pada daerah yang kurang optimal. Kurang optimalnya daerah ini dikarenakan cakupan dan kualitas Radio Frequency (RF)
Pilar Tiara Lelepadang, Eva Yovita Dwi Utami, Andreas Ardian Febrianto   +2 more
doaj   +1 more source