Communication channels with variable parameters
The theory of «paired echoes» is a universal mathematical apparatus for analyzing linear and nonlinear phenomena in radio engineering circuits and communication channels. In this paper, we analyze linear communication channels with variable parameters. Linear distortions in communication channel...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Omsk State Technical University, Federal State Autonoumos Educational Institution of Higher Education
2018-04-01
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| Series: | Омский научный вестник |
| Subjects: | |
| Online Access: | https://www.omgtu.ru/general_information/media_omgtu/journal_of_omsk_research_journal/files/arhiv/2018/2%20(158)/88-92%20%D0%A5%D0%B0%D0%B7%D0%B0%D0%BD%20%D0%92.%20%D0%9B.,%20%D0%9A%D0%BE%D0%B2%D0%B0%D0%BB%D0%B5%D0%B2%D0%B0%20%D0%9C.%20%D0%9D..pdf |
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| Summary: | The theory of «paired echoes» is a universal mathematical
apparatus for analyzing linear and nonlinear phenomena in
radio engineering circuits and communication channels. In this
paper, we analyze linear communication channels with variable
parameters. Linear distortions in communication channels with
constant parameters were considered by the authors in the
previous article. Radio circuits with nonlinear distortions are
supposed to be analyzed in the next article.
Below we study the effect of the time variation of the signal
amplitude and phase on the nature of its spectrum. In principle,
this problem is considered in depth in various teaching aids in
sections devoted to modulation. Nevertheless, given the task
of demonstrating a universal mathematical apparatus known as
the theory of paired echoes for analyzing linear and nonlinear
phenomena in radio engineering circuits and communication
channels, it is advisable to consider the effect of time variations in
the amplitude and phase of the signal that occurs in channels of
communication with variable parameters, on the structure of the
spectrum of this signal. In contrast to conventional amplitude and
angle modulation changes the amplitude and the phase of signal
in channels of communication can take place simultaneously and
under the influence of random factors. The specific examples
considered in the article show that the time variation of the
amplitude and phase of the signal transmitted through the
communication channel with variable parameters leads to an
additional expansion of its spectrum. |
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| ISSN: | 1813-8225 2541-7541 |