Search results for "Costas"

showing 3 items of 13 documents

Non-linear analysis of a modified QPSK Costas loop

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 article for a modified QPSK Costas loop we analyze the hold-in, pull-in and lock-in ranges. New procedure for estimation of the lock-in range is considered and compared with previously known approach. peerReviewed

non-linear analysisPSK demodulatorCostas loopPLLlock-in rangenumerical simulationelektroniset piiritmatemaattiset mallitComputer Science::Information Theory
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Computation of the lock-in ranges of phase-locked loops with PI filter

2016

In the present work the lock-in range of PLL-based circuits with proportionallyintegrating filter and sinusoidal phase-detector characteristics are studied. Considered circuits have sinusoidal phase detector characteristics. Analytical approach based on the methods of phase plane analysis is applied to estimate the lock-in ranges of the circuits under consideration. Obtained analytical results are compared with simulation results. peerReviewed

pull-out frequencyCostas loopPLLhidden oscillationslock-in rangephase-locked loopnonlinear analysis
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Mathematical models and simulation of Costas loops

2013

vaihelukitut silmukatCostas-silmukatCostas loopQPSK Costas loopPLLphase-locked loopGPSelektroniset piiritsimulointicarrier trackingmatemaattiset mallitBPSK Costas loop
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