Results 11 to 20 of about 362,427 (261)

Planck-LFI: Design and Performance of the 4 Kelvin Reference Load Unit [PDF]

, 2009
The LFI radiometers use a pseudo-correlation design where the signal from the sky is continuously compared with a stable reference signal, provided by a cryogenic reference load system.
A Brighenti, A De Rosa, A Garbesi, A Gregorio, A Mennella, A Simonetto, A Zacchei, A Zonca, A. Mennella ., A. Mennella ., D.J. Fixsen ., E Panagin, F Cavaliere, F Cuttaia, F Villa, G Morgante, G Morigi, G Orsi, G P Cazzola, G. Morgante ., G. Papendrecht, G. Papendrecht, J. Leahy ., J. Tauber ., J. Varis ., J.-L. Puget, J.A. Tauber, J.A. Tauber, J.A. Tauber, J.C. Mather, J.M. Lamarre ., L Mendes, L Pagan, L Stringhetti, L Terenzi, L Valenziano, M Bersanelli, M Biggi, M Frailis, M Maris, M Sandri, M Tomasi, M. Bersanelli ., M. Sandri, M. Sandri ., N Mandolesi, N. Mandolesi ., O D'Arcangelo, P Battaglia, P Meinhold, R C Butler, R Lapini, R Leonardi, S Galeotta, S Levin, S Mariotti, S R Lowe, T.W. Bradshaw   +57 more
core   +2 more sources

LTE RSRP, RSRQ, RSSNR and local topography profile data for RF propagation planning and network optimization in an urban propagation environment

Data in Brief, 2018
In the design of 5 G cellular communication to guarantee quality signal reception at every point within a coverage area, fundamental knowledge of the channel propagation characteristics is vital. A correct knowledge of electromagnetic wave propagation is
Oluyomi Simpson, Yichuang Sun
doaj   +1 more source

Group-delay measurement of frequency-converting devices using a comb generator [PDF]

, 2010
We propose a new method for the measurement of (group) delay from the radio-frequency (RF) input to the intermediate-frequency (IF) output of a mixer or a receiver.
Hoy, M., Scott, Jonathan B.
core   +2 more sources

Reference frequencies comb generation for microwave photonics ADC with signal spectral-interval estimation [PDF]

ITM Web of Conferences, 2019
Formation of a reference frequency comb in a circuit comprising a highly stable continuous laser and an amplitude Mach- Zehnder modulator with two independent RF inputs working with large modulation index for use in a high-speed microwave photonics ADC ...
Kulagin Victor, Cherepenin Vladimir, Kontorov Sergey, Prokhorov Denis, Valuev Victor   +4 more
doaj   +1 more source

Simple method for stabilizing an optical frequency comb to an optical reference without an RF signal generator

OSA Continuum, 2019
We have experimentally demonstrated a simple and robust method for achieving a narrow-linewidth optical frequency comb (OFC) without an RF signal generator (SG). Our method requires fewer RF components than previous methods. The Allan deviation and integrated RMS phase noise with our method for the in-loop carrier-envelope-offset-frequency signal are 3.
Atsushi Ishizawa, Kenya Hitomi, Kazutaka Hara, Kenichi Hitachi, Tadashi Nishikawa, Tetsuomi Sogawa, Hideki Gotoh   +6 more
openaire   +1 more source

Analysis of Internally Bandlimited Multistage Cubic-Term Generators for RF Receivers [PDF]

, 2009
Adaptive feedforward error cancellation applied to correct distortion arising from third-order nonlinearities in RF receivers requires low-noise low-power reference cubic nonidealities.
Hajimiri, Ali, Keehr, Edward A.
core   +1 more source

The GPS Assimilator: a Method for Upgrading Existing GPS User Equipment to Improve Accuracy, Robustness, and Resistance to Spoofing [PDF]

, 2010
Preprint of the 2010 ION GNSS Conference Portland, OR, September 21–24, 2010A conceptual method is presented for upgrading existing GPS user equipment, without requiring hardware or software modifications to the equipment, to improve the equipment’s ...
Bhatti, Jahshan, Humphreys, Todd, Ledvina, Brent   +2 more
core   +2 more sources

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

Quantitative MR renography using a calibrated internal signal (ERETIC) [PDF]

, 2002
To measure MR renograms, cortical and medullary kidney signal intensity evolution is followed after contrast agent injection. To obtain an accurate quantitative signal measurement, the use of a reference signal is necessary to correct the potential MRI ...
C. Chapon, F. Franconi, L. Barantin, L. Lemaire, S. Akoka, V. Lehmann   +5 more
core   +3 more sources

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