Results 181 to 190 of about 833 (229)

Costas Loop Experiments for a 10.6 µm Communications Receiver

IEEE Transactions on Communications, 1983
We have transferred the principle of the Costas-type nonlinear phase-locked loop to the \lambda = 10.6 \mu m wavelength of CO 2 lasers. The ability of the optical Costas loop to regenerate the carrier of a binary phase-shift-keyed input signal and to perform coherent demodulation was demonstrated at a data rate of 20 Mbits/s.
A Scholtz, E Bonek
exaly   +3 more sources

Alias Lock Behavior of Sampled-Data Costas Loops

IEEE Transactions on Communications, 1980
The potential false lock problem associated with the sampled data type of Costas loop implementation is addressed in this paper. The term "alias lock" is used here to differentiate this type of false lock behavior from the data sideband false lock behavior of analog Costas loops [1]-[8].
Marvin K. Simon, Kai T. Woo
exaly   +3 more sources

False Lock Performance of Shuttle Costas Loop Receivers

IEEE Transactions on Communications, 1978
The false (sideband) lock problem in Shuttle Costas loop receivers, in the presencse of noise, is assessed in this paper. False lock margin is defined depending on symbol signal-to-noise ratio rather than in the absence of noise as reported earlier in [4], [5].
W Lindsey, J Holmes
exaly   +3 more sources

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,
R Gagliardi
exaly   +3 more sources

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.
Alexander Mileant, Sami Hinedi
openaire   +2 more sources

Nonlinear Models of BPSK Costas Loop

Proceedings of the 11th International Conference on Informatics in Control, Automation and Robotics, 2014
Rigorous 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., Kuznetsova, Olga, Kuznetsov, Nikolay, Leonov, Gennady Alekseevich, Seledzhi, Svetlana, Yuldashev, Marat, Yuldashev, Renat   +7 more
openaire   +3 more sources

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.
George L. Hedin, Jack K. Holmes, William C. Lindsey, Kai T. Woo   +3 more
openaire   +3 more sources

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

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

False-Lock Performance Improvement in Costas Loops

IEEE Transactions on Communications, 1982
A technique is described to reduce the probability of false-lock in Costas loops. This is where a frequency offset arises at a multiple of half the incoming data rate due to finite bandwidth of the arm filters. A modification is described to process components of this offset so as to augment the feedback control voltage. The performance is analyzed and
Amir H. Makarios, Timothy C. Tozer
openaire   +2 more sources