Results 221 to 230 of about 1,202 (266)
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Optimum Performance of Suppressed Carrier Receivers with Costas Loop Tracking
IEEE Transactions on Communications, 1977The performance of suppressed carrier receivers with Costas loop tracking is optimized by proper choice of loop arm filter bandwidth. In particular, it is shown that for a variety of passive arm filter types, there exists, for a given data rate and data signal-signal-to-noise ratio, an optimum filter bandwidth in the sense of minimizing the loop's ...
W Lindsey
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Non-linear analysis of a modified QPSK Costas loop
IFAC-PapersOnLine, 2019 A Costas loop is one of the classical phase-locked loop based circuits, 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. In this
N V Kuznetsov +2 more
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Signal Processing, 2015 The analysis of the stability and numerical simulation of Costas loop circuits for highfrequency signals is a challenging task. The problem lies in the fact that it is necessary to simultaneously observe very fast time scale of the input signals and ...
G A Leonov +2 more
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Lock detection in Costas loops
IEEE Transactions on Communications, 1992Previous 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.
Alexander Mileant, Sami Hinedi
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Theory of False Lock in Costas Loops
IEEE Transactions on Communications, 1978This 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.
George L. Hedin +3 more
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Nonlinear Models of BPSK Costas Loop
Proceedings of the 11th International Conference on Informatics in Control, Automation and Robotics, 2014Rigorous nonlinear analysis of the physical model of Costas loop is very difficult task, so for analysis, simplified mathematical models and numerical simulation are widely used. In the work it is shown that the use of simplified mathematical models, and the application of non rigorous methods of analysis may lead to wrong conclusions concerning the ...
Kudryashova, E. V. +7 more
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Differential equations of Costas loop
Doklady Mathematics, 2012The 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. +3 more
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Mathematical models of the Costas loop
Doklady Mathematics, 2015zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Leonov, G. A. +4 more
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