Results 11 to 20 of about 5,941,522 (258)
Indoor geolocation for wireless networks [PDF]
, 2011 An ever growing demand for ‘location based services’ and the unprecedented growth of wireless local area networks (WLAN) has, in the past few years, attracted the focus of the research community to investigate and develop accurate indoor geolocation ...
Ali, Shahid
core +7 more sources
Non-Steady State NMR Effect and Application on Time-Varying Magnetic Field Measurement
Sensors, 2022 The measurement of a time-varying magnetic field is different from a constant magnetic field, due to its field intensity variation with time. Usually, the time-varying magnetic field measurement converts the solution of the magnetic induction intensity ...
Xiaohu Zeng +4 more
doaj +1 more source
Radio Frequency Database Construction and Modulation Recognition in Wireless Sensor Networks
Sensors, 2022 Current modulation recognition methods in wireless sensor networks rely too much on simulation datasets. Its practical application effect cannot reach the expected results.
Kun Liu, Xin Xiang, Liyan Yin
doaj +1 more source
A high-efficiency RF transmitter using VCO-derived synthesis: CALLUM [PDF]
, 1998 The combined analog locked-loop universal modulator (CALLUM) is a radio-frequency (RF) transmitter topology which produces a linear output through the use of nonlinear, but highly efficient, RF power amplifiers.
Jennings, D, McGeehan, JP
core +1 more source
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
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 +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 +3 more
core +1 more source
Compact modelling in RF CMOS technology [PDF]
, 2011 With the continuous downscaling of complementary metal-oxide-semiconductor (CMOS) technology, the RF performance of metal-oxide-semiconductor field transistors (MOSFETs) has considerably improved over the past years.
Liu, Jun
core +2 more sources
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 +6 more
openaire +1 more source
Online Calibration for LTE-Based Antenna Array System
International Journal of Antennas and Propagation, 2016 This paper presents a novel calibration method that equalizes the impulse responses of all the Radio Frequency (RF) modules of an antenna array system operating in Long-Term Evolution (LTE) evolved NodeB (eNB).
Kyunghoon Kim +5 more
doaj +1 more source