INVESTIGATION OF METHODS OF EVALUATING QUALITY
OF TRANSMITTED SIGNAL IN COMMUNICATION CHANNEL
Nadezhda N. Ermakova
Postgraduate Student, Department of Telecommunications Systems,
Volgograd State University
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Prosp. Universitetsky, 100, 400062 Volgograd, Russian Federation
Dmitry A. Tyukhtyaev
Senior Lecturer, Department of Telecommunications Systems,
Volgograd State University
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Prosp. Universitetsky, 100, 400062 Volgograd, Russian Federation
Evgeniy S. Semenov
Candidate of Sciences (Engineering), Associate Professor,
Head of the Department of Telecommunications Systems,
Volgograd State University
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Prosp. Universitetsky, 100, 400062 Volgograd, Russian Federation
Abstract. There are many different measurement methods and methods, thanks to
which digital models of the system are analyzed for noise immunity, distortion, security, versatility,
cost-effectiveness and accuracy. The concept of “universality” is general in nature and applied
to any digital signal, the concept of “cost-effectiveness” is the efficient use of bandwidth,
equipment and network resources. “Accuracy” is the key requirement in the construction and
transmission of information over a communication network. Various characteristics of the
transmission channel - bandwidth, transmission levels, dynamic range, level diagram, amplitude-
frequency response, phase-frequency response, the error rate for a certain time interval give
an idea of the state of the channel, path, and equipment. According to their analysis, it is easy
to eliminate or improve that component of the communication channel. The article presents
and investigates popular tools for assessing the quality of transmitted information over a digital
communication channel. The MATLAB Simulink software environment was used, a digital
communication channel was modeled using QPSK modulation. The MATLAB Simulink
software environment was used, a digital communication channel was modeled using QPSK
modulation. This modulation is actively used in satellite broadcasting, when streaming satellite
channels SD and some HD channels, works at high transmission speeds, thereby being one of
their most popular at the moment. An experiment of signal transmission over a communication
channel was carried out; the received signal was evaluated in various ways for noise immunity
and distortion.
Key words: signal, circuit, communication channel, data analysis, modulation, eye
diagram, signal constellation, bit error coefficient, distortion, interference.
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