Results 251 to 260 of about 1,859,997 (304)

A short survey on nonlinear models of QPSK Costas loop

IFAC-PapersOnLine, 2017
The Costas loop is a modification of the phase-locked loop circuit, which demodulates data and recovers carrier from the input signal. The Costas loop is essentially a nonlinear control system and its nonlinear analysis is a challenging task.
N. Kuznetsov, O. Kuznetsova, G. Leonov, M. Yuldashev, R. Yuldashev   +4 more
exaly   +2 more sources

Some of the next articles are maybe not open access.

Related searches:

Differential equations of Costas loop

Doklady Mathematics, 2012
The Costas loop was invented in the 1950s [1] and is intended for carrier phase recovery from signals widely applied in communications and control sys tems [2–4]. To describe a mathematical model of the Costas loop in the form of differential equations, it was neces sary to develop asymptotic methods for analyzing high frequency oscillations ...
Leonov, G. A., Kuznetsov, N. V., Yuldashev, M. V., Yuldashev, R. V.   +3 more
openaire   +1 more source

Lock detection in Costas loops

IEEE Transactions on Communications, 1992
Previous analyses of lock detector algorithms for Costas loops have ignored the effects of the inherent correlation between samples of the phase error process. In this work, analysis and simulations are used to quantify the effects of phase correlation on lock detection for the 'square law' and 'absolute value' type detectors.
A. Mileant, S. Hinedi
openaire   +1 more source

Theory of False Lock in Costas Loops

IEEE Transactions on Communications, 1978
This paper is concerned with new results on data related false lock of Costas loops caused by arm filter distortion of the data. The false lock phenomena is demonstrated to occur for random as well as periodic data and the relative levels of lock are predicted.
Hedin, George L., Holmes, Jack K., Lindsey, William C., Woo, Kai T.   +3 more
openaire   +2 more sources

Dynamic Behavior Analysis of the Costas Loop under CW Interference Using Runge-Kutta and Galerkin Methods

International Conference on Speech Technology and Human-Computer Dialogue
When a Costas loop is subjected to Continuous Wave (CW) interference, it will exhibit complex dynamic behavior. Because of the amplitude and frequency of the CW interference, the loop may lose its lock on the desired frequency and instead lock onto other
Yuhang Liang, Wenyi Wang
semanticscholar   +1 more source

Mathematical models of the Costas loop

Doklady Mathematics, 2015
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Leonov, G. A., Kuznetsov, Nikolay, Yuldashev, M. V., Yuldashev, R. V.   +4 more
openaire   +2 more sources

Dual-Polarization Optical Costas Loop for DSP-Free Homodyne Short-Reach Links

Journal of Lightwave Technology
Here we report a dual-polarization, O-band optical phase-locked loop packaged in a footprint compatible with pluggable optics. Custom-designed analog Costas loop electronics and silicon photonic circuits, including a hybrid-integrated tunable laser ...
Junqian Liu, Aaron Wissing, Ghazal Movaghar, Hector Andrade, Stephen M. Misak, Aaron Maharry, James Dalton, Luis A. Valenzuela, Xinhong Du, Evan D. Chansky, Giovanni Gilardi, G. Su, Ranjeet Kumar, Larry A. Coldren, Adel A. M. Saleh, J. Buckwalter, C. Schow   +16 more
semanticscholar   +1 more source

All Electrical Costas Loop for Carrier-Forwarded Analog Coherent DCI Receivers: System Integration, Characterization, and Measurements

IEEE Transactions on Instrumentation and Measurement
Carrier phase offset tracking, a crucial operation in analog signal processing-based coherent receivers, aims at the measurement and correction of the time-varying phase offset in the received signal and enables reliable data recovery.
Rakesh Ashok, Sana Naaz, Punit Jain, Rashmi Kamran, Shalabh Gupta   +4 more
semanticscholar   +1 more source

Real-time Wideband Video Synchronization via an Analog QPSK Costas Loop in a Laboratory Demonstration of an E-Band Satellite Downlink

2024 IEEE Space Hardware Radio Conference (SHaRC)
A wideband video transmission in E-band from 71 to 76 GHz dedicated to a satellite downlink is demonstrated in a laboratory setup with an analog QPSK Costas loop circuit in 130nm SiGe BiCMOS in the receiver front-end for direct demodulation.
J. Wörmann, L. Manoliu, S. Haussmann, M. Krstić, Ingmar Kallfass   +4 more
semanticscholar   +1 more source

Stable Tracking of Low Signal-to-Noise Ratio Targets Using a Costas Loop Combining FLL+PLL

2024 IEEE 2nd International Conference on Sensors, Electronics and Computer Engineering (ICSECE)
Traditional target tracking methods face problems such as low positioning accuracy and weak robustness, which seriously restrict communication performance and reliability.
Jin Xu, Yueying Guan, Hai Wang, Yufan Wang, Hailang Feng, Yifeng He   +5 more
semanticscholar   +1 more source