APPLICATION OF COMPUTER MODELING TO ASSESS THE NOISE IMMUNITY OF DIGITAL COMMUNICATION LINES WITH M-ARY FREQUENCY-SHIFT-KEYED

2020 ◽  
pp. 20-28
Author(s):  
A. V. Fomin ◽  
V. V. Voznyuk ◽  
V. M. Baranov
Keyword(s):  
Frequency Shift ◽  
Noise Immunity ◽  
Digital Communication ◽  
Communication Line ◽  
High Frequency Signal ◽  
Destructive Effect ◽  
Noise Interference ◽  
Software Model ◽  
Shift Keying ◽  
Receiver Model

The article considers the process of unintended noise interference with variable frequency and spectrum width values on a digital communication line with multi-position frequency manipulation. To conduct research in the modeling environment Matlab developed software model allows to estimate the influence of noise of various structures to receive signals from multiple frequency shift keying and obtain the dependence of the probability of bit error against signal-to-noise. The transmitter model allows you to generate a high-frequency signal manipulated by the frequency of an information message, which is represented in the work as a set of ASCIIRU-code characters. The receiver model is based on the scheme of optimal coherent reception of a frequency-manipulated signal. To improve the quality of signal reception, the transmitter and receiver models include: an interference-resistant encoder and decoder, an interleaver and deinterleaver, and an amplitude limiter. The interference model allows you to form a noise interference with a given band, with random amplitudes distributed according to the Rayleigh law, and random phases according to a uniform law in the interval [0, 2π]. Evaluation of the noise immunity of a signal receiver with multi-position frequency manipulation is performed on the basis of simulation for various noise parameters. Patterns of interference that have the most destructive effect on the receiver of signals with multi-position frequency manipulation are revealed. The protective ratio is used as an indicator of the effectiveness of radio-electronic protection, and the probability of a symbolic error (p* = 0.01) is the criterion for making a decision about the operability of the radio line.

scholarly journals MATHEMATICAL MODEL OF THE RECEIVING PATH OF DIGITAL COMMUNICATION LINES

T-Comm ◽  
2021 ◽  
Vol 15 (5) ◽  
pp. 52-57
Author(s):  
Vitaly G. Dovbnya ◽  
◽  
Dmitry S. Koptev ◽  
Keyword(s):  
Mathematical Model ◽  
Noise Immunity ◽  
Digital Communication ◽  
Automatic Gain Control ◽  
Clock Synchronization ◽  
Gain Control ◽  
Communication Line ◽  
Digital Signals ◽  
Dynamic Errors ◽  
Communication Lines

Modern trends in the development of digital communication lines of fixed information transmission services, as well as the characteristics of continuous channels today determine the noise immunity of radio receiving systems. The main directions of its increase in terms of the radio receiving device as a whole and the demodulator device in particular are as follows: reducing the frequency and nonlinear distortions of the signal in the linear path, increasing the stability and purity of the spectral line of oscillations of local oscillators, increasing the selectivity for the mirror and combination channels of reception, compensation for intersymbol and cross – polarization interference, improving the functioning of the automatic gain control device (reducing static and dynamic errors), improving the quality of the functioning of the carrier wave recovery device and the clock synchronization device. Taking into account all of the above factors in order to increase the overall noise immunity of a digital communication line is a very difficult and urgent task, the solution of which must begin with the development of a mathematical model of a continuous digital communication line channel. This article discusses the radio receiving path of a digital communication line in an urban environment. The obtained analytical expressions are aimed at interpreting the processes of converting digital signals in the structural elements of radio receiving systems. The originality of the mathematical model developed in the article lies in the fact that it additionally, in comparison with similar models, takes into account the following number of factors: frequency instability and phase fluctuations of oscillations of the local oscillator synthesizer, dynamic and static errors in the operation of automatic gain control devices, carrier vibration recovery devices and devices clock synchronization of radio receiving systems of digital signals.

scholarly journals Model for Assessing the Immunity of Channels Using Frequency Manipulation Signals

2021 ◽  
Vol 2096 (1) ◽  
pp. 012045
Author(s):  
V K Fedorov ◽  
E G Balenko ◽  
S V Dvornikov ◽  
O S Lauta
Keyword(s):  
Frequency Shift ◽  
Noise Immunity ◽  
Robotic Systems ◽  
Frequency Shift Keying ◽  
Shift Keying ◽  
Time Coincidence

Abstract The issues of noise immunity of control channels of robotic systems using signals with frequency shift keying are considered. The article presents the results of estimating the probability of a bit error depending on the duration of the intervals at which the time coincidence of the structural interference with the signal occurs. Proposals are formulated for the practical use of the results obtained.

Study on FSK Signal Demodulation Based on Chirp-Z Transform

2012 ◽  
Vol 532-533 ◽  
pp. 827-831
Author(s):  
Jiang Hua Xia ◽  
Jing Guo ◽  
Xiao Ming Wang
Keyword(s):  
Frequency Shift ◽  
Matlab Simulation ◽  
A Algorithm ◽  
Signal Parameters ◽  
Detailed Explanation ◽  
Symbol Rate ◽  
Shift Keying ◽  
Signal Demodulation ◽  
Track Circuits ◽  
Strong Ability

The Frequency-Shift Keying (FSK) signal is frequently used in track circuits because of the strong ability of resistance interference. Symbol rate is one of the important signal parameters for safety of railway. The paper propose a algorithm of high precise detectation of FSK signal using Chirp-Z transform; Theoretically gives the detailed explanation to the major technique, and has carried on the Matlab simulation, The simulation result indicates this method during the enhancement is shifted signal examination precision, reduced the computation order of complexity.

A Simple Modulator for Sinusoidal Frequency Shift Keying

1982 ◽  
Vol 30 (5) ◽  
pp. 1048-1051 ◽  
Author(s):  
R. LaRosa ◽  
T. Marynowski ◽  
K. Henrich
Keyword(s):  
Frequency Shift ◽  
Frequency Shift Keying ◽  
Shift Keying

scholarly journals An Ultrasonic Multiple-Access Ranging Core Based on Frequency Shift Keying Towards Indoor Localization

Sensors ◽  
2015 ◽  
Vol 15 (8) ◽  
pp. 18641-18665 ◽  
Author(s):  
Laurent Segers ◽  
David Van Bavegem ◽  
Sam De Winne ◽  
An Braeken ◽  
Abdellah Touhafi ◽  
...  
Keyword(s):  
Frequency Shift ◽  
Multiple Access ◽  
Indoor Localization ◽  
Frequency Shift Keying ◽  
Shift Keying
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