scholarly journals Two-Time Procedure for Calculation of Carrier Frequency of Phasomodulated in Communication Systems

2021 ◽  
Vol 13 (3) ◽  
Author(s):  
Oleksandr Leonidovich Turovsky ◽  
Vadym Vlasenko ◽  
Nataliia Rudenko ◽  
Oleksandr Golubenko ◽  
Oleh Kitura ◽  
...  
Keyword(s):  
Communication System ◽  
Carrier Frequency ◽  
Communication Systems ◽  
Frequency Estimation ◽  
Observation Interval ◽  
Minimum Variance ◽  
Continuous Mode ◽  
Radio Communication ◽  
Radio Communication System ◽  
The Given

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.

scholarly journals Pembangunan Repeater Radio di Daerah Terpencil untuk Koordinasi Sistem Tenaga Listrik

2020 ◽  
Vol 12 (2) ◽  
pp. 170-178
Author(s):  
Suhardhika Sih Sudewanto
Keyword(s):  
Communication System ◽  
Communication Systems ◽  
Geographical Location ◽  
Selection Method ◽  
Optimal Location ◽  
Electrical Network ◽  
Radio Communication ◽  
Software Simulation ◽  
Electricity System ◽  
Radio Communication System

Expansion of the electrical network and substation makes a demand for better electricity system coordination. A radio communication system is one of many ways that fulfill such demand. The range of radio communication systems is limited by geographical location. Establishing a series of radio links to cover a wide area can not be considered as a solution to have good quality and reliable radio communication system anymore. Therefore, It needs one optimal location for radio repeater to cover all sites that have a crucial role in electricity system coordination. The optimal location for the mountainous geographical region is usually located in a remote area, far from civilization. It will need more effort on engineering to establish a radio repeater site. The selection method of location and development phase will be done by software simulation and actual survey to conduct testing, to determine the equipment needed to build radio repeater, and for administrative purposes. With the average fade margin of 25 dB, the location of the radio repeater is considered optimal enough to maximize electricity system coordination.

scholarly journals Design of OFDM-Based Radio Communication Systems for Coast-to-Sea and Coast-to-Air Propagation Environments

2016 ◽  
Vol 23 (1) ◽  
pp. 12-19 ◽  
Author(s):  
Sławomir Gajewski
Keyword(s):  
System Design ◽  
Communication System ◽  
Interface Design ◽  
Communication Systems ◽  
Signal Propagation ◽  
Point Of View ◽  
Propagation Model ◽  
Radio Communication ◽  
Communication System Design ◽  
Radio Communication System

Abstract In the paper the study of radio communication system design process for systems based on OFDM transmission is considered. The signal propagation model for 1.4 GHz frequency band is discussed, and the study of signal propagation characteristics, important from the point of view of OFDM system design, is presented. The methodology of OFDM interface design is proposed and some characteristics of the OFDM-based radio communication system are analysed.

scholarly journals Noise immunity of digital information transmission in a radio communication system by DQPSK signals with frequency hopping spread spectrum in the partial-band jamming noise.

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
A.A. Paramonov ◽  
◽  
Van Zung Hoang ◽  
Keyword(s):  
Spread Spectrum ◽  
Communication System ◽  
Communication Systems ◽  
Noise Immunity ◽  
Frequency Hopping ◽  
Digital Information ◽  
Radio Communication ◽  
Large Signal ◽  
Frequency Hopping Spread Spectrum ◽  
Radio Communication System

The article deals with an algorithm for noncoherent reception of signals with Differential Quadrature Phase Shift Keying (DQPSK) using their weight processing for radio communication systems (RCS) with Frequency-hopping spread spectrum (FHSS) under Partial-band jamming noise (concentrated in the interference spectrum). Numerical calculations of bit/symbol error probability in the reception of DQPSK signals with a symbol-by-symbol frequency hopping are presented, as well as the results of modelling the considered reception algorithm for a radio communication system with an intra-symbol frequency hopping to study the noise immunity of receiving a DPQSK signal in the considered mode. It is shown that for not too large signal-to-jamming ratios when only a part of the operating frequencies is clogged by this noise, the noncoherent reception algorithm with weight processing provides higher noise immunity than the symbol-by-symbol frequency-hopping algorithm.

Radio communication systems high-speed railway transport

2017 ◽  
pp. 57-68
Author(s):  
Dmitriy Royenkov ◽  
Pavel Plekhanov ◽  
Vladimir Shmatchenko
Keyword(s):  
Life Cycle ◽  
Communication System ◽  
Communication Systems ◽  
High Speed ◽  
Digital Systems ◽  
System Capacity ◽  
Railway Transport ◽  
Radio Communication ◽  
Railroad Transport ◽  
The Given

Objective: To study the main approaches to organization of radio communication on high-speed railroad transport, to determine the requirements for functional capabilities and the structure of radio communication systems. Methods: The analysis of modern international and home practice in the sphere of radio telecommunication systems was applied for railway transport, on the basis of application strategy of interconnected indices’ complex, including reliability, availability, maintainability and safety (Reliability, Availability, Maintainability and Safety – RAMS) and cost (Life Cycle Cost – LCC) at all stages of transportation systems’ life cycle. Results: GSM-R standard was chosen as the basic one for organization of digital systems of engineering radio communication for high-speed mainlines. The choice was conditioned by the fact that the standard in question was developed for the purposes of railroad transport and is the basis for constructing European integrated railway radio enhanced network EIRENE (European Integrated Railway Radio Enhanced Network). Moreover, it was established that the most promising standard of radio communication for railway transport might be LTE (LTE-R) standard. Communication system capacity of the given standard, its applicability for the solution of the extensive range of railway radio communication tasks (including the task of providing customer radio communication) will make it possible to replace several different radio communication systems, solving specific functional tasks, by one which is more convenient and reliable. However, global and domestic experience of the standard in question application on railroad transport (including high-speed mainlines) has yet been insufficient, while the cost of LTE equipment is significantly higher compared to GSM-R standard. Practical importance: The requirements for functionality and structure of radio communication systems for high-speed networks were stated, including the requirements for digital systems of engineering radio communication (basic and reserved), the system of engineering on-line repair radio communication and digital wireless data communication system. Certain standards of radio communication allow for the realization of the given requirements.

METHOD FOR INCREASING TRANSFER RATE IN HF RADIO SYSTEMS AND ITS IMPLEMENTATION (part 1)

2020 ◽  
pp. 7-22
Author(s):  
B. G. Shadrin ◽  
V. A. Dvoryanchikov ◽  
B. S. Bogankov
Keyword(s):  
Frequency Band ◽  
Communication System ◽  
Communication Systems ◽  
Transfer Rate ◽  
Communication Channel ◽  
Block Diagram ◽  
Radio Communication ◽  
External Interference ◽  
Radio Systems ◽  
Radio Communication System

A method for increasing the transfer rate in HF radio communication systems is proposed, which, in comparison with existing methods, allows it to be doubled without expanding the frequency band occupied by the communication channel. The block diagram of one of the variants of the HF radio communication system that implements the proposed method is presented. The analysis of the operation of the communication system in the absence of external interference and the influence of interference concentrated over the spectrum is carried out.

scholarly journals Assessment of Radio Communication System Reliability by System Dynamics Method

2021 ◽  
Author(s):  
Batzorig Bazargur ◽  
Otgonbayar Bataa ◽  
Uuganbayar Budjav
Keyword(s):  
Research Methodology ◽  
Communication System ◽  
Communication Systems ◽  
Large Scale ◽  
Underground Mining ◽  
System Modeling ◽  
Underground Mine ◽  
Radio Communication ◽  
Radio Communication System ◽  
New Research

Radio communication system in an underground mine is one of the very essential systems for the underground mine. It is required that the radio communication system must be reliable from the starting to construct the underground mine to the closure of the mine. However, underground mine radio communication systems reliability is required to be tested on an active radio communication system in a real environment. In the study was suggested a new research methodology that is studied reliability using dynamic system modeling on Vensim software instead of traditional method to study the reliability of radio communication systems calculating large-scale differential equations. In other words, we suggest a new research methodology. The Motorola Dimetra (TETRA) radio communication system's availability readiness information was used to simulate the reliability of the underground mine radio communication system probability of reliability using Vensim software for system dynamic modeling.Also, the factors that affect the reliability of underground mining radio communication systems was studied. The study was determined factors that affect the underground mine radio communication system from the following risks. The study was in the examples of the Oyu Tolgoi underground mine. The factors that affect the reliable operation of the underground mine radio communication system were determined using the failure statistics of TETRA radio communication system in the Oyu Tolgoi mine in 2015-2018.

scholarly journals Distributed Coding for OFDM based Cooperative HF Radio Communication System

2019 ◽  
Vol 8 (2) ◽  
pp. 3138-3142
Keyword(s):  
Communication System ◽  
Channel Coding ◽  
Communication Systems ◽  
Future Generation ◽  
Radio Communication ◽  
Voice Communication ◽  
Radio System ◽  
Distributed Coding ◽  
High Data ◽  
Radio Communication System

High frequency (HF) radio system now-a-days used to establish the communication in an area which is isolated from the outside world due to natural calamities. Conventional HF systems are associated with analog voice communication systems; is now shifted to digital voice communication to meet the demands as expected for high data rates for transmission. Cooperative communication is different from conventional relay-assisted HF systems and aims to support the challenging expectation of future generation HF communication systems. Recent days distributed coding is a variety of channel coding developed in a distributed manner for cooperative wireless networks. In this paper we present an overview of various distributed coding design in OFDM based cooperative HF radio communication system.

scholarly journals PROCEDURE FOR EVALUATION OF THE SUPPORTING FREQUENCY SIGNAL OF THE SATELLITE COMMUNICATION SYSTEM IN CONTINUOUS MODE

2021 ◽  
pp. 28-38
Author(s):  
A. L. Turovsky ◽  
O. V. Drobik
Keyword(s):  
Maximum Likelihood ◽  
Communication System ◽  
Carrier Frequency ◽  
Phase Modulation ◽  
Communication Systems ◽  
Satellite Communication ◽  
Continuous Mode ◽  
Satellite Communication System ◽  
Signal Parameters ◽  
Hardware Realization

Context. One of the features of satellite communication systems is the advantageous use in them during the reception of the signal in the continuous mode of phase modulation of signals intended for the transmission of useful information. The use of this type of modulation requires solving the problem of estimating the carrier frequency of the signal. And the estimation itself is reduced to the problem of estimating the frequency of the maximum in the spectrum of a fragment of a sinusoidal signal against the background of additive Gaussian noise. The article considers the process of estimating the carrier frequency of a signal by a satellite communication system in a continuous mode according to the rule of maximum likelihood. Objective. Development of a procedure for estimating the carrier frequency of a signal received by a satellite communication system in a continuous mode according to the maximum likelihood rule. Method. The procedure proposed in the work and the algorithm developed on its basis allows to estimate the carrier frequency according to the rule of maximum likelihood, taking into account the conditions of uncertainty of all signal parameters by the satellite communication system in continuous mode. The results. For the purpose of practical introduction of the specified algorithm in operating schemes of satellite communication, schemes of its hardware realization are offered in work. To illustrate the ratio of the limits of the minimum limiting variance of the carrier frequency estimate, the paper presents dependencies that allow comparing the minimum limiting variance defined by the lower Cramer-Rao boundary and the minimum limiting variance determined taking into account all signal parameters. Conclusions. Analysis of these dependences showed that in real conditions the minimum dispersion of the carrier frequency of the signal according to the rule of maximum likelihood received by the satellite communication system in continuous mode with uncertainty of all signal parameters may differ significantly from the minimum dispersion obtained by applying the lower Kramer-Rao boundary. Prospective research, development and creation of algorithms and techniques aimed at estimating the carrier frequency at the minimum limiting variance in the conditions of uncertainty of all parameters of the received signal should be aimed at the maximum approximation of the minimum limiting variance of the estimated carrier frequency to the lower Cramer-Rao boundary to estimate the carrier frequency under conditions of certainty of other signal parameters.

scholarly journals Development of the method of structural-parametric synthesis of the subsystem of interference of special purpose radio communication systems

2021 ◽  
Vol 3 (1(59)) ◽  
pp. 40-44
Author(s):  
Andrii Shyshatskyi ◽  
Vitalii Hasan ◽  
Anatolii Hasan ◽  
Serhii Kravchuk ◽  
Yuriy Shidlovsky ◽  
...  
Keyword(s):  
Communication System ◽  
Communication Systems ◽  
Queuing Theory ◽  
Noise Immunity ◽  
Radio Communication ◽  
Parametric Synthesis ◽  
Radio System ◽  
Radio Systems ◽  
Radio Communication System ◽  
The Military

The object of research is the military radio communication system. One of the most problematic areas in the management of military radio resources is the interference of military radio systems and facilities. A number of works have been devoted to the research of ways to increase the noise immunity of military radio communication systems and facilities. However, the known works contain some results of research by scientists aimed at increasing the noise immunity of military radio systems and facilities and do not have a comprehensive approach. In this article, the problem of developing a method of structural-parametric synthesis of the noise protection subsystem of special purpose radio communication systems is solved. The scientific problem is solved by formalizing the problem of structural-parametric synthesis of the noise protection subsystem of military radio communication systems, starting with its mathematical description and synthesis of the quantitative and qualitative structure of the noise protection subsystem. In the course of the research, the authors used the main provisions of the queuing theory, the theory of automation, the theory of complex technical systems and general scientific methods of cognition, namely analysis and synthesis. The novelty of this technique is the synthesis of the structure of the military radio system and the parameters of the radio system in the context of electronic conflict. This technique is multi-criteria, in which the parameters are different in importance. The basis of this technique is the principle of nonlinear scheme of A. Voronin compromises. This technique allows to: – to synthesize the structure of the radio communication system in the conditions of electronic conflict; – to determine the optimal number of radio communication devices to ensure management tasks in the conditions of electronic conflict; – to substantiate a set of mechanisms to increase the noise immunity of the noise protection subsystem in the conditions of electronic conflict. The results of the research should be used at the stage of planning and operational management of the structure and parameters of military radio communication systems.

scholarly journals The improvement of method for the multi-criteria evaluation of the effectiveness of the control of the structure and parameters of interference protection of special-purpose radio communication systems

2021 ◽  
Vol 4 (2(60)) ◽  
pp. 22-27
Author(s):  
Anatolii Minochkin ◽  
Andrii Shyshatskyi ◽  
Vitalii Hasan ◽  
Anatolii Hasan ◽  
Andrii Opalak ◽  
...  
Keyword(s):  
Communication System ◽  
Communication Systems ◽  
Noise Immunity ◽  
Radio Resource Management ◽  
Interference Management ◽  
Radio Communication ◽  
Radio Electronic ◽  
Radio Systems ◽  
Radio Communication System ◽  
The Military

Military radio communication systems are the basis of special purpose control systems and the object of the enemy’s primary influence. Therefore, the issue of increasing the noise immunity of military radio communication systems is important and needs further research. Thus, the object of the research was chosen to be a military radio communication system. Maintaining a given level of noise immunity for military radio systems is one of the key issues in radio resource management, the effective management of which allows the use of the entire suitable frequency range for the transmission (reception) of electromagnetic energy by radio electronic devices. A number of works have been devoted to the ways search for increasing the noise immunity of military radio communication systems. One such way is to develop new (improve existing) approaches for assessing the effectiveness of military radio interference management. This work solves the problem of improving the method of multicriteria management effectiveness evaluation of the structure and parameters of the military radio systems noise protection. The scientific problem is solved by the devices of multicriteria estimation of the of noise protection level of the military radio communication system, graphic display of the executed and not executed tasks, the aggregation scheme of formation of the integrated estimation of noise protection. The research used scientific methods of analysis and synthesis, also the theory provisions of signal-code structures and the provisions of the complex technical systems theory. The peculiarity of the proposed improvement of the methodology is the multi-criteria assessment of the noise immunity level of the military radio communication system in the conditions of radio electronic conflict. The proposed technique allows: – to evaluate the effectiveness of noise protection management; – to substantiate the optimal configuration of the military radio communication system in solving the problems of noise protection management in the conditions of radio electronic conflict; – to identify the ways to increase noise immunity at the stage of operational management of the military radio communication system in the conditions of electronic conflict. The results of the research should be used in assessing the effectiveness of management of noise protection of military radio communication systems and determining the optimal structure and parameters of military radio systems.

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