Frequency hopped CDMA for third generation mobile radio systems [PDF]
, 1993 Third generation mobile radio systems will provide unified mobile access to a wide range of services for the mass user market. Code division multiple access (CDMA) is one of the most viable access techniques to provide the flexible air interface required.
Purle, DJ +3 more
core +1 more source
Multi-frequency HF radar measurements of artificial F-region field-aligned irregularities [PDF]
, 2004 International audienceWe present radar backscatter power measurements using the CUTLASS HF radar at Hankasalmi, Finland from F-region field-aligned irregularities induced by HF radio pumping with the EISCAT Heating facility.
A. Senior +15 more
core +1 more source
RFID – Radio Frequency Identification
Informatik-Spektrum, 2008 Der Radio Frequency Identification (RFID) wurde sowohl in der wissenschaftlichen als auch in der popularwissenschaftlichen Literatur in der letzten Zeit viel Aufmerksamkeit eingeraumt. Es handelt sich dabei um eine Technologie, mit der Objekte der Realwelt uber Funkwellen identifiziert werden konnen.
Melski, Adam +2 more
openaire +2 more sources
Effects of intermodulation distortion on the performance of a hybrid radio/fiber system employing a self-pulsating laser diode transmitter [PDF]
, 2003 A self-pulsating laser is used to generate a multicarrier (five radio frequency (RF) channels) microwave optical signal for use in a hybrid radio/fiber system. The self-pulsation is achieved by external light injection into the laser diode.
Anandarajah, Prince M. +2 more
core +1 more source
Dynamical and topological properties of the spin angular momenta in general electromagnetic fields
Communications Physics, 2023 Spin angular momenta play important roles in light–matter interactions, leading to the emergence of the spin Hall effect and topological quasiparticles in modern optics.
Peng Shi +5 more
doaj +1 more source
Baseband Radio over Fiber Aided Millimeter-Wave Distributed Antenna for Optical/Wireless Integration [PDF]
, 2013 A Baseband Radio Over Fiber (BROF) architecture is proposed, where upto four Radio Frequency (RF) carriers can be generated, while using the heterodyne photo-detection of only two optical signals. This proposed BROF architecture has a star-like structure
Salman Ghafoor +7 more
core +1 more source
Radio frequency plasma production on the TOMAS device
, 2023 The study of discharge initiation by an Ion Cyclotron Range of Frequency (ICRF) antenna is of importance for operational scenarios at low magnetic field in e.g., ITER and Wendelstein 7-X.
Petersson, P. +11 more
core +2 more sources
Bit error simulation of DQPSK for a slow frequency hopping CDMA system in mobile radio communications [PDF]
, 1995 Spread spectrum (SS) techniques seem to be an attractive alternative to conventional narrow-band modulation. In this paper a frequency hopping (FH) system model based on slow FH (SFH) is proposed.
Mortazavi, SH +3 more
core +1 more source
Construction of optical system for an atomic clock-beyond atomic fountain
Frontiers in Physics, 2022 We demonstrate the construction of the optical system in the atomic clock-beyond atomic fountain based on 87Rb atom. The optical system includes a high-stability laser system and an optical lattice.
Xiumei Wang +21 more
doaj +1 more source
Reconfigurable wideband patch antenna for cognitive radio
, 2009 Cognitive radio communication is envisaged to be a new paradigm of methodologies for enhancing the performance of radio communication systems through the efficient utilization of radio spectrum.
AbuTarboush, HF +14 more
core +1 more source