Research of communication channel characteristics

2020 ◽  
Author(s):  
Igor' Shirokov ◽  
Yuriy Gimpilevich
Keyword(s):  
Communication Channel ◽  
Experimental Studies ◽  
Engineering Systems ◽  
Radio Waves ◽  
Phase Fluctuations ◽  
Radio Engineering ◽  
Channel Characteristics ◽  
Signal Transformation ◽  
Destabilizing Factors ◽  
Microwave Signals

The questions of studying the amplitude and phase characteristics of communication channels of radio engineering systems are considered. As part of the research, a homodyne method for converting microwave signals is proposed, which makes it possible to measure amplitude and phase fluctuations with high accuracy and with the utmost simplicity of measuring equipment. The development of the homodyne method of signal transformation for the purposes and tasks of determining the amplitude and phase fluctuations of signals during the propagation of radio waves on open lines of sight is presented. The features of homodyne signal transformation in the presence of various destabilizing factors are considered. The issues of synchronization of reference generators on different parts of the measuring route are considered. The results of theoretical and experimental studies of amplitude and phase fluctuations on land and sea lines of sight are presented. For students and teachers, as well as anyone interested in radio engineering.

BANDWIDTH OF THE RECEIVER OF DIGITAL SIGNALS WITH A LARGE DYNAMIC RANGE

2021 ◽  
Vol 0 (11) ◽  
Author(s):  
A. E. Denisov ◽  
◽  
D. P. Danilaev ◽  
G. I. Il'in ◽  
◽  
...  
Keyword(s):  
Communication Channel ◽  
Dynamic Range ◽  
Signal To Noise Ratio ◽  
Digital Signals ◽  
Resolution Time ◽  
Large Dynamic Range ◽  
Signal To Noise ◽  
Radio Engineering ◽  
Channel Parameters ◽  
Analytical Relations

The analysis of the connection between the bandwidth and the dynamic range, the signal-to-noise ratio, the resolution time and the bandwidth is carried out. The problems are solved by deriving analytical dependencies based on the Shannon – Hartley theorem, as well as the well-known postulates of the theory of radio engineering circuits and signals. The study of analytical relations allows us to identify restrictions on the choice of communication channel parameters.

Data transmission in Hybrid Distributed Environment

2016 ◽  
Vol 6 (6) ◽  
pp. 2989
Author(s):  
Anton Pavlovich Teykhrib
Keyword(s):  
Packet Loss ◽  
Data Transmission ◽  
Communication Channel ◽  
Packet Transmission ◽  
Distributed Environment ◽  
High Quality ◽  
Channel Characteristics ◽  
Network Layers ◽  
Distribution Scheme ◽  
Selection Of

<p>This article discusses a hybrid distributed environment including two levels of nodes: the first level which has high quality channels between the nodes, and the second one in which the nodes are directly involved in communication and the communication is performed through the first-level nodes. For the indicated distribution scheme, the questions of selection of the best path between the first-level nodes are solved based on such communication channel characteristics as delay in packet transmission, jitter in transmission, packet loss in transmission, and choosing a method for data transmission through the selected best path: protocols of transport and network layers have been compared, and the use of network layer has been preferred.</p>

The Multifractal Structure of Small-Scale Artificial Ionospheric Turbulence

2013 ◽  
Vol 22 (1) ◽  
Author(s):  
F. I. Vybornov ◽  
A. V. Rakhlin
Keyword(s):  
Experimental Studies ◽  
Multifractal Spectrum ◽  
Small Scale ◽  
Radio Waves ◽  
Ionospheric Turbulence ◽  
Heating Facility ◽  
Artificial Ionospheric Turbulence ◽  
Radio Sounding ◽  
Scale Turbulence ◽  
Disturbed Ionosphere

AbstractWe present the results of investigation of a multifractal structure of the artificial ionospheric turbulence when the midlatitude ionosphere is affected by high-power radio waves. The experimental studies were performed on the basis of the SURA heating facility with the help of radio sounding of the disturbed region of ionospheric plasma by signals from the Earth’s orbital satellities. In the case of vertical radio sounding of the disturbed ionosphere region, the measured multipower and generalized multifractal spectra of turbulence coincide well with similar multifractal characteristics of the ionosperic turbulence under the natural conditions. In the case of oblique sounding of the disturbance region at small angles between the line of sight to the satellite and the direction of the Earth’s magnetic field, a nonuniform structure of the small-scale turbulence with a relatively narrow multipower spectrum and small variations in the generalized multifractal spectrum of the electron density was detected.

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