Results 81 to 90 of about 1,635,520 (251)

Design of Digital Communications for Strong Phase Noise Channels

IEEE Open Journal of Vehicular Technology, 2020
To meet the requirements of beyond 5G networks, the significant amount of unused spectrum in sub-TeraHertz frequencies is contemplated for high-rate wireless communications.
Simon Bicais, Jean-Baptiste Dore
doaj   +1 more source

A Noise-Shifting Differential Colpitts VCO [PDF]

, 2002
A novel noise-shifting differential Colpitts VCO is presented. It uses current switching to lower phase noise by cyclostationary noise alignment and improve the start-up condition.
Aparicio, Roberto, Hajimiri, Ali
core  

Quantum Noise Limits for Nonlinear, Phase-Invariant Amplifiers

, 1994
Any quantum device that amplifies coherent states of a field while preserving their phase generates noise. A nonlinear, phase-invariant amplifier may generate less noise, over a range of input field strengths, than any linear amplifier with the same ...
C. M. Caves, D. Kouznetsov, D. S. Greywall, Daniel Rohrlich, Dmitri Kouznetsov, F. Hausdorff, G. H. Weiss, H. A. Haus, I. E. Protsenko, J. Vaccaro, M. Tavis, Roberto Ortega-Martínez, Y. Yamamoto   +12 more
core   +1 more source

Method for Phase Noise Impact Compensation in 60 GHz OFDM Receivers [PDF]

Radioengineering, 2020
This paper presents a method for phase noise impact compensation in 60 GHz OFDM receivers and provides the results of performance evaluation using OFDM PHY parameters defined in the IEEE 802.11ay standard.
A. Lomayev, V. Kravtsov, M. Genossar, A. Maltsev, A. Khoryaev   +4 more
doaj  

Flicker noise in high-speed p-i-n photodiodes

, 2005
The microwave signal at the output of a photodiode that detects a modulated optical beam contains the phase noise phi(t) and the amplitude noise alpha(t) of the detector.
Maleki, Lute, Rubiola, Enrico, Salik, Ertan, Yu, Nan   +3 more
core   +3 more sources

Improved weighted least-squares phase unwrapping method for interferometric SAR processing

The Journal of Engineering, 2019
Based on the study of existed least-squares and weighted least-squares phase unwrapping methods, an improved weighted least-squares algorithm based on unwrapping phase error compensation is proposed.
Yu Hui, Wang Wenying, Zhuang Long, Lei Wanming, Nie Xin, Li Pin   +5 more
doaj   +1 more source

Simplified Laser Frequency Noise Measurement Using the Delayed Self-Heterodyne Method

Photonics
Here, we report on a simplified laser frequency noise measurement technique employing an acousto-optic modulator, a delay line, and a real-time oscilloscope. The technique is a slight modification of the typical delayed heterodyne method.
Seán P. Ó Dúill, Liam P. Barry
doaj   +1 more source

Phase Noise Compensation for Nonlinearity-Tolerant Digital Subcarrier Systems With High-Order QAM

IEEE Photonics Journal, 2017
The fundamental penalty of subcarrier modulation (SCM) with independent subcarrier phase noise processing is estimated. It is shown that the fundamental signal-to-noise ratio (SNR) penalty related to poorer phase noise tolerance of decreased baudrate ...
M. P. Yankov, L. Barletta, D. Zibar
doaj   +1 more source

Dynamic Creation and Annihilation of Metastable Vortex Phase as a Source of Excess Noise

, 2002
The large increase in voltage noise, commonly observed in the vicinity of the peak-effect in superconductors, is ascribed to a novel noise mechanism.
Banerjee S. S., E Zeldov, G Jung, M. J Higgins, M. L Rappaport, S Bhattacharya, Y Myasoedov, Y Paltiel   +7 more
core   +1 more source

Digital Phase Noise Compensation for DSCM-Based Superchannel Transmission System With Quantum Dot Passive Mode-Locked Laser

IEEE Photonics Journal, 2018
We propose a simplified digital phase noise compensation technique for a Nyquist pulse-shaped digital subcarrier multiplexed (DSCM) coherent optical transmission system, employing an optical frequency comb based on Quantum dot passive mode-locked laser ...
Govind Vedala, Maurice O'Sullivan, Rongqing Hui   +2 more
doaj   +1 more source