Research of the jitter impact on the digital frequency conversion process

Author(s):  I.A. Sidorenko, candidate of Sciences, associate Professor, Belgorod National Research University, Belgorod, Russia,

I.I. Lubkov, Belgorod National Research University, Belgorod, Russia,

Issue:  Volume 46, № 3

Rubric:  Infocommunication technologies

Annotation:  The article describes a simulation model of a digital frequency converter, designed to study the influence of the reference generator jitter on the process of digital frequency conversion. This model was developed in the environment of computer simulation LabVIEW®. The model performs idealized up-and-down digital frequency conversion, and frequency conversion with the introduction of deterministic and phase jitter into the conversion process. Jitter parameters can be set and adjusted. Frequencies of deterministic jitter range from 100 Hz to 500 kHz. The results of the effect on the quadrature M-QAM signal of different frequencies of deterministic jitter and the random component of jitter (phase noise) are given. The parasitic amplitude modulation of the M-QAM signal introduced by jitter, its effect on the distortion of the spectrum of the converted signal is shown. Obtained the evaluation of the results. Developed practical recommendations for the implementation of digital frequency converters.

Keywords:  digital frequency conversion, sampling, jitter, simulation modeling, a computer model, signal spectrum.

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