scholarly journals On the assessment of the reliability of the train radio communication channel

2021 ◽  
Vol 2131 (4) ◽  
pp. 042096
Author(s):  
D N Roenkov ◽  
P A Plekhanov
Keyword(s):  
Communication Networks ◽  
Communication Channel ◽  
Radio Channel ◽  
Point Of View ◽  
Radio Station ◽  
Calculation Formula ◽  
Radio Communication ◽  
Communication Reliability ◽  
Radio Communication System ◽  
Mobile Subscriber

Abstract The research purposeis to develop an approach to assessing the reliability of a train radio communication channel based on the representation of a radio communication network in the form of a model that includes both traditional elements (various types of equipment, a wire channel) and a radio channel, which is proposed to be described by the availability of radio coverage, which varies depending on the location of the mobile subscriber. In the research methods of the theory of reliability, and, in particular, the assessment of the availability factor of the elements of the radio communication system and communication channels, dynamically changing during the movement of the mobile radio station. In addition, to assess the energy of radio channels, the theory of radio wave propagation was applied, including on the basis of industry recommendations for calculating radio communication networks of JSC Russian Railways. As result of the research, a method was proposed for assessing the dependence of the reliability of a train radio communication channel (in terms of readiness) on the track coordinate. In this case, the radio communication channel dynamically changes the composition of the elements when the mobile subscriber moves along the railway section. Simultaneously, for each point of the section, the calculation formula is also dynamically changed, which makes it possible to find the value of the readiness of the communication channel. The proposed approach allows to identify the sections of technological radio communication networks that are weakest from the point of view of communication reliability and take this information into account when planning work to improve the reliability of communication networks.

Universal Software Radio Peripheral/GNU Radio-Based Implementation of a Software-Defined Radio Communication System

2019 ◽  
pp. 227-240
Author(s):  
Ehsan Sheybani
Keyword(s):  
Communication System ◽  
Software Defined Radio ◽  
Software Radio ◽  
Block Code ◽  
Radio Station ◽  
Frequency Change ◽  
Gnu Radio ◽  
Radio Communication ◽  
Space Communications ◽  
Radio Communication System

Challenges involved in space communications across wireless channels call for new approaches to radio systems. Due to the growing need for frequency change in modern wireless systems, an adaptive radio system has the highest demand. Software-defined radios (SDR) offer this type of adaptivity as well as compatibility with other standard platforms such as USRP/GNU radio. Despite limitations of this approach due to hardware components, viable modeling and simulation as well as deployable systems are possible using this platform. This chapter presents a detailed implementation procedure for a USRP/GNU radio-based SDR communication system that can be used for practical experiments as well as an academic lab in this field. In this experiment the USRP has been configured to receive signal from a local radio station using the BasicRX model daughterboard. The programmable USRP executes Python block code implemented in the GNU Radio Companion (GRC) on Ubuntu OS.

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 Outdoor radiolinks for 2.4 GHz-frequencies: measurement results and experiences within the radio communication network “Intermobil Region Dresden"

2003 ◽  
Vol 1 ◽  
pp. 301-307
Author(s):  
O. Michler
Keyword(s):  
Communication Network ◽  
Communication Networks ◽  
Fresnel Zone ◽  
Multipath Propagation ◽  
Radio Channel ◽  
Path Loss ◽  
Radio Communication ◽  
Technical Parameters ◽  
Measurement Results ◽  
Technical Solutions

Abstract. The radio communication network “Intermobil Region Dresden" was developed and built up for data transmission of traffic videos and other traffic data. It uses Pointto- Point (PtP) and Point-to-Multipoint (PtM) bridges, forming the backbone structure. The traffic camera radio clients link up with Accesspoints, installed at the nodal points of the backbone. This paper analyses the physical and technical conditions, building up such radio communication networks. The radio channel properties (e.g. total path loss, multipath propagation) and the technical parameters (e.g. transmission power, sensitivity, antenna gain) belong to this conditions. Based on calculation and spreading measurements it is shown, that reserves have to be considered during the planning already. As well special problems, like Fresnel-zone clearance and shadowing are discussed. The choice of the antenna plays a key role for planning and building of wireless networks. It determines decisively the range and gives an important contribution to elimination of wireless disturbances (interferences). Dependent on topological facts, installation environment and wireless distance omnidirectional-, yagi-, patch- and parabol-antennas are used. Based on antenna measurements the paper discusses the use and property of decoupling. WLANs are working in the license free 2.4 GHz-band. The number of radio systems in this band increases permanently, which leads to a lot of interferences among each other. The paper makes a classification of possible interference sources and discusses their influence on transmission quality. Technical solutions are shown for increase interference robustness.

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 Impulse Noise Parameter Assessment in a Batch Radio Channel

2019 ◽  
Vol 7 (3) ◽  
pp. 28-40
Author(s):  
A. Yu. Bekkiev ◽  
V. A. Makoviy
Keyword(s):  
Impulse Noise ◽  
Additive Noise ◽  
Radio Channel ◽  
Radio Station ◽  
Radio Communication ◽  
Radio Communications ◽  
Radio Stations ◽  
Noise Environment ◽  
Actual Signal ◽  
Valid Assessment

Modern radio communication means to provide safe data transmission due to adapting radio channel to the actual noise environment. It is impossible to conduct proper comparative tests on various radio stations offered by manufacturers and to compare objectively the results obtained in field without actual signal parameters and noise environment instrument inspection at the reception point. The paper considers tactical level radio communications system operation when jammed with powerful impulse noise of various nature. It suggests a device enabling to assess the main parameters of impulse noise, namely desired signal and additive noise mixture envelope effective value, impulse noise envelope effective value, impulse noise duty factor. To provide measurement independence from a specific realization of a decoder it is suggested to use the envelope of a signal received by a radio station. The developed device uses standard radio channel data batches as measuring signals and does not require changing radio channel or radio network algorithms and timing charts. A method to assess the effective value of desired signal envelope and additive noise mean-square value when the received signal involves impulse noise is suggested. The paper demonstrates that valid assessment of desired signal and additive noise mixture is possible in case of setting aside selection values affected by impulse noise. A device separating symbols affected by impulse noise from those that are not affected is suggested. Formulas that allow synthesizing the device operation algorithms are obtained. The structure chart of the measurer is developed; the algorithms used to assess measured parameters are given.

RUSSIAN MARKET OF PROFESSIONAL MOBILE RADIO AND CRITICAL COMMUNICATIONS: CURRENT STATE, PROBLEMS, PROSPECTS

2021 ◽  
Author(s):  
О.А. ШОРИН ◽  
Р.Ю. КАСПАРИ
Keyword(s):  
Information Transmission ◽  
Communication Networks ◽  
Communication Technology ◽  
Mobile Radio ◽  
Radio Communication ◽  
Russian Market ◽  
Critical Information ◽  
Current State ◽  
Telecommunications Market

Рассмотрены характеристики и аудитория сетей профессиональной радиосвязи и критических коммуникаций. Проведен анализ используемых в России технологий профессиональной радиосвязи и перспектив развития данного сегмента телекоммуникационного рынка, произведена оценка его объемов в пятилетней перспективе. Показано, что внедряемая технология широкополосной профессиональной связи МАКВИЛ не только решает назревшие проблемы, связанные с модернизацией морально и физически устаревших систем ведомственной и корпоративной транкинговой связи, но и открывает новые возможности роста рынка услуг передачи критически важной информации. The characteristics and audience of professional mobile radio and critical communication networks are reviewed. The analysis of professional mobile radio technologies used in Russia and the prospects for the development of this segment of the telecommunications market is carried out, as well as its volume is estimated in the five-year perspective. It is shown that McWiLL broadband professional radio communication technology not only solves the urgent problems associated with the modernization of morally and physically obsolete systems of departmental and corporate trunking communications, but also opens up new opportunities for the growth of the market for critical information transmission services.

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