Results 241 to 250 of about 1,202 (266)

Best's conjecture on pull-in range of two-phase Costas loop

2014 6th International Congress on Ultra Modern Telecommunications and Control Systems and Workshops (ICUMT), 2014
In the present work for checking conjecture on pull-in range of two-phase Costas loop, a number of numerical experiments in MatLab Simulink has been made. In addition, the analytical approach to the proof of the conjecture is presented.
Alexandrov, K. D., Kuznetsov, Nikolay, Leonov, G. A., Seledzhi, S. M.   +4 more
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Introduction: From Phase-Locked Loop to Costas Loop

2017
The Costas loop can be considered an extension of the phase-locked loop (PLL). The PLL, invented 1932 by French engineer Henri de Belleszice, was first used for the synchronous reception of amplitude modulated radio signals with carrier (c). If the modulation index is less than 100%, the modulated signal is always in phase with the carrier signal (c ...
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The behavior of a Costas loop in the presence of space telemetry signals

IEEE Transactions on Communications, 1992
When the Costas loop is operated in the presence of a residual carrier space telemetry signal, the loop reconstructs its carrier reference from an input signal whose carrier component is not completely suppressed. The telemetry signal investigated in this work is generated by phase shift-keying the data onto a subcarrier and then phase modulating onto ...
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Coupled AGC-Costas Loops with AM/PM Conversion

IEEE Transactions on Communications, 1980
Costas loops are invariably designed in conjunction with an automatic gain control (AGC) loop for stabilizing performance. In such systems an inherent coupling between the AGC and Costas loops develops, complicating the standard phase referencing analysis. This coupling is further emphasized if the gain control amplifier introduces an AM/PM conversion,
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Nonlinear analysis of Costas loop circuit

Proceedings of the 9th International Conference on Informatics in Control, Automation and Robotics, 2012
Nikolay V. Kuznetsov, Gennady A. Leonov, Marat V. Yuldashev, Renat V. Yuldashev   +3 more
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Costas Loop for Quadrature Amplitude Modulation

2017
A Costas loop for the reception of Quadrature Amplitude Modulation (QAM) signals is presented in this chapter. The generation of the QAM signal is described first. When the data signals (I and Q in this case) are unfiltered, the modulated QAM signal would occupy a large frequency range. To reduce bandwidth, the I and Q signals are usually filtered.
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Tracking Performance of Costas Loops with Hard-Limited In-Phase Channel

IEEE Transactions on Communications, 1978
It is becoming increasingly popular in the design of suppressed carrier receivers, which employ Costas loops for earrier reconstruction, to hard-limit the output of the in-phase channel. Doing so allows replacement of the analog multiplier, which forms the loop error signal, with a chopper-type device which typically exhibits much less dc offset.
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On the Calculation of Squaring Loss in Costas Loops with Arbitrary Arm Filters

IEEE Transactions on Communications, 1978
Summary: The calculation of the optimum performance of suppressed carrier receivers with Costas loop tracking is directly related to evaluating the loop's so-called squaring loss. Recent work by the author and others presented specific numerical results for this loss when the input data were biphase-L (Manchester coded) and the Costas loop arm filters ...
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Costas Loop for BPSK Using Phasor Rotator Circuit

2017
A Costas loop for BPSK is described that has another topology than the types described in Chaps. 3 and 5. The circuit considered here does not use a VCO (voltage-controlled oscillator) or DCO (digital-controlled oscillator) for frequency and phase tracking; the local oscillator is simply an ordinary fixed frequency oscillator.
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A Review Paper on Costas Loop

International Journal of Wireless and Mobile Communication for Industrial Systems, 2018
Yogesh Chandra Tripathi, Naveen Chandra Arya, Gaurav Singh Negi, Lalit Singh Garia   +3 more
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