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 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.

Design Analytics of Complex Communication Systems Involving Two Different Sensory Disabilities

2017 ◽  
Vol 12 (2) ◽  
pp. 65-80
Author(s):  
Gahangir Hossain
Keyword(s):  
System Design ◽  
Communication System ◽  
Communication Systems ◽  
Complexity Analysis ◽  
Modern Technology ◽  
Flow Diagram ◽  
Communication Device ◽  
Sensory Disabilities ◽  
Healthcare Communication ◽  
Communication System Design

The design of a robust communication among two different sensory disabilities (Deaf vs. Blind) remains an emerging field of research in disability healthcare communication system design. As an important part of modern technology, android and iPhone applications are frequently used in designing such communication systems. However, there is no 'one-size-fits-all' in case of different sensory disability health communication design. Hence, an in-depth understanding of their requirement, media preferences, similarity and difference and up-to-date technology usability are plausible towards universal and personalized communication system design. This research addresses such complex issues and performs a study involving two different types of disabilities (deaf and blind) communication. As a part of healthcare analytics, critical incidences are recorded and corresponding complexities are measured in order to evaluate communication protocol with social signal processing. Communication flow diagram, complexity analysis and critical incidence are quantified to improve communication protocols. Moreover, the uniqueness of disability can be personalized through this process which has valuable implications in rehabilitation and multi-purpose healthcare communication device development.

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.

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.

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 Design Analytics of Complex Communication Systems Involving Two Different Sensory Disabilities

Ophthalmology ◽  
2018 ◽  
pp. 300-316
Author(s):  
Gahangir Hossain
Keyword(s):  
System Design ◽  
Communication System ◽  
Communication Systems ◽  
Modern Technology ◽  
Flow Diagram ◽  
Sensory Disabilities ◽  
Healthcare Communication ◽  
Communication Flow ◽  
Communication System Design ◽  
Media Preferences

The design of a robust communication among two different sensory disabilities (Deaf vs. Blind) remains an emerging field of research in disability healthcare communication system design. As an important part of modern technology, android and iPhone applications are frequently used in designing such communication systems. However, there is no 'one-size-fits-all' in case of different sensory disability health communication design. Hence, an in-depth understanding of their requirement, media preferences, similarity and difference and up-to-date technology usability are plausible towards universal and personalized communication system design. This research addresses such complex issues and performs a study involving two different types of disabilities (deaf and blind) communication. As a part of healthcare analytics, critical incidences are recorded and corresponding complexities are measured in order to evaluate communication protocol with social signal processing. Communication flow diagram, complexity analysis and critical incidence are quantified to improve communication protocols. Moreover, the uniqueness of disability can be personalized through this process which has valuable implications in rehabilitation and multi-purpose healthcare communication device development.

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.

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