Two-Time Procedure for Calculation of Carrier Frequency of Phasomodulated in Communication Systems | [International Journal of Communication Networks and Information Security • 2021]

Author(s):

1. Turovsky Oleksandr: National Aviation University,Kyiv,Ukraine

2. Vadym Vlasenko: State University of Telecommunications,Kyiv,Ukraine

3. Nataliia Rudenko: State University of Telecommunications,Kyiv,Ukraine

4. Oleksandr Golubenko: State University of Telecommunications,Kyiv,Ukraine

5. Oleh Kitura: State University of Telecommunications,Kyiv,Ukraine

6. Oleksandr Drobyk: State University of Telecommunications,Kyiv,Ukraine

Abstract:

The use in radio communication systems of phase modulation of a signal intended for the transmission of useful information in a continuous mode creates the problem of frequency uncertainty of the received signal by frequency. In practice, it is not possible to implement frequency estimation in the conditions of chat uncertainty of the signal in the channel with low energy of the signal received in the continuous mode. Therefore, the estimation of the carrier frequency offset of the signal received relative to the nominal value is carried out before other synchronization procedures are included, namely: phase synchronization and clock synchronization. The paper generalizes the procedure and forms a two-step procedure for calculating the carrier frequency of the phase-modulated signal of a radio communication system for data transmission in a continuous mode, taking into account the condition of uncertainty of all signal parameters. Achieving the minimum observation interval in the given order of calculation of the carrier frequency is ensured by the use of the fast Fourier transform function. In order to analyze the effectiveness of this procedure, the process of estimating the carrier frequency of the phase-modulated signal of the radio communication system during data transmission in continuous mode and functional dependences of the maximum frequency in the signal spectrum and the minimum variance of carrier frequency estimation. This procedure allows a two-stage assessment of the carrier frequency according to the rule of maximum likelihood, taking into account the condition of uncertainty of all parameters of the signal received by the satellite communication system in a continuous mode with a minimum observation interval. Achieving the minimum observation interval in the given order of carrier frequency estimation is ensured by using the fast Fourier transform function and two estimation steps. The analysis of the efficiency of the estimation of the specified order was carried out on the basis of comparison of a ratio of the received minimum variance of an estimation of a carrier frequency and theoretically possible border of the minimum variance.

Page(s): 382-387

DOI: DOI not available

Published: Journal: International Journal of Communication Networks and Information Security, Volume: 13, Issue: 3, Year: 2021

Keywords:

fast Fourier transform function , signal frequency estimation algorithm , minimum estimation margin variance , Carrier frequency estimation , frequency maximum estimation

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