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.

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.

Safety management of high-speed railway transport

2017 ◽  
pp. 105-118
Author(s):  
Vladimir Shmatchenko ◽  
Pavel Plekhanov
Keyword(s):  
Life Cycle ◽  
Life Cycle Cost ◽  
High Speed ◽  
A Priori Estimates ◽  
Safety Management ◽  
Practical Importance ◽  
International Standards ◽  
Railway Transport ◽  
High Speed Railway ◽  
Safety Control

Objective: To determine the main approaches to safety management of high-speed railway transport on the basis of modern international and domestic practices in the specified sphere. Methods: Analysis methods of security risks on railway transport were considered in accordance with modern international standards of management of interconnected indices’ complex, which include reliability, availability, maintainability and safety and cost (Life Cycle Cost – LCC) at all stages of transportation systems’ life cycle: EN 50126 (IEC 62278), EN 50128 (IEC 62279), EN 50129 (IEC 62425) and IEC 60300-3-3. Results: The main approaches to safety measures of high-speed railway lines (VSM) were detected. The former involve using a lifecycle concept of engineering systems and facilities, management methodology of RAMS/LCC interconnected indices’ complex at all stages of a life cycle, wide application of the process approach and the tools of quality and safety management systems, development and implementation of technological maturity assessment methodology for security management activities, as well as object-oriented and coherent improvement of regulatory base, the systems of administrative and control and permission authorities, technical and technological development, management of external, inland and allocated risks under market relations. Practical importance: The examined approaches of VSM safety control make it possible to obtain a priori estimates of safety control processes and thus determine the achieved level of safety together with the levels of technological maturity of railway organizations’ processes.

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.

Differential space-time block coding method for application in mobile radio communication systems using MIMO technology.

2021 ◽  
Author(s):  
M.S. Tokar ◽  
◽  
I.V. Ryabov ◽  
Keyword(s):  
Communication Systems ◽  
High Speed ◽  
Communication Channel ◽  
Space Time ◽  
The State ◽  
Radio Communication ◽  
Transmission Method ◽  
Space Time Coding ◽  
Channel One ◽  
Differential Transmission

In radio communication systems, when implementing coherent types of reception, it is assumed that the receiver knows information about the state of the communication channel, which is achieved by introducing signal redundancy (pilot signals). The frequency of sending pilot signals depends on factors that change the state of the communication channel, one of which is the high speed of movement of mobile stations. The use of pilot signals not only hinders the efficient use of the radio frequency resource, but also, in the case of fast fading, does not allow the channel to be estimated and tracked with the required accuracy. These disadvantages can be eliminated by using the differential transmission method, for the implementation of which there is no need to know information about the state of the channel. The application of the principles of differential transmission to space-time coding does not find sufficiently effective solutions that combine low computational complexity and energy efficiency of differential coding methods.

scholarly journals Broadband Microstrip Antenna for 5G Wireless Systems Operating at 28 GHz

Electronics ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 1
Author(s):  
Rafal Przesmycki ◽  
Marek Bugaj ◽  
Leszek Nowosielski
Keyword(s):  
Microstrip Antenna ◽  
Communication Systems ◽  
High Speed ◽  
Wireless Systems ◽  
High Energy ◽  
Design Solution ◽  
Radio Communication ◽  
Compact Structure ◽  
Large Bandwidth ◽  
Fifth Generation

Communication systems have been driven towards the fifth generation (5G) due to the demands of compact, high speed, and large bandwidth systems. These types of radio communication systems require new and more efficient antenna designs. This article presents a new design solution of a broadband microstrip antenna intended for use in 5G systems. The proposed antenna has a central operating frequency of 28 GHz and can be used in the LMDS (local multipoint distribution service) frequency band. The dimensions of the antenna and its parameters have been calculated, simulated, and optimized using the FEKO software. The antenna has a compact structure with dimensions (6.2 × 8.4 × 1.57) mm. Rogers RT Duroid 5880 material was used as a substrate for the antenna construction, which has a dielectric coefficient of 2.2 and a thickness of 1.57 mm. The antenna described in the article is characterized by a low reflection coefficient of −22.51 dB, a high energy gain value of 3.6 dBi, a wide operating band of 5.57 GHz (19.89%), and high energy efficiency.

scholarly journals Effective Power Allocation Using for Transmit Source In MIMO Relay Communication

2021 ◽  
Vol 5 (3) ◽  
Author(s):  
Hoai Trung Tran
Keyword(s):  
Channel Capacity ◽  
Communication Systems ◽  
High Speed ◽  
Mimo Systems ◽  
Multiple Input Multiple Output ◽  
Optimization Method ◽  
Radio Communication ◽  
Second Derivatives ◽  
Multiple Input ◽  
Input Multiple Output

The Multiple Input Multiple Output (MIMO) systems using relays are of interest for high-speed radio communication systems. Currently, most of the articles are interested in the model of three nodes with purposes such as increasing the channel capacities (mutual information) or reducing the minimum mean square of error. This paper extends to more than one relay and is concerned with the maximum channel capacity. It is assumed that the channel matrices between source and relay as well as relay and receiver are random matrices; the relay precoders are also assumed to be random and known at the receiver. The article proposes that the Lagrange multiplier finding algorithm using the Newton – Raphson optimization method is more straightforward than the traditional finding algorithm using the first and second derivatives but still gives a higher channel capacity.

scholarly journals Intelligent railway transport radio communication based on neural networks

2021 ◽  
Vol 264 ◽  
pp. 05044
Author(s):  
Igor Kolesnikov ◽  
Natalya Yaronova ◽  
Janibek Kurbanov ◽  
Nozima Khusnidinova
Keyword(s):  
Mobile Communications ◽  
High Speed ◽  
Digital Communication ◽  
Integrated System ◽  
Railway Transport ◽  
Radio Communication ◽  
Digital Radio ◽  
High Speed Trains ◽  
Radio Communication System

The article is devoted to the features of GSM-R as a basis for organizing a digital radio communication system on the railway to apply the European Integrated Radio Communication for the railways of Uzbekistan. The role of GSM-R for the interaction of digital radio communication with the European integrated system for expanding the functions of railway radio communication and safe movement of high-speed trains is shown. The article identifies the possibilities of building modern digital communication of the railway. The GSM-R communication network, its services and architecture for organizing digital communication were also defined. Recommendations on the use of GSM-R on the railway of Uzbekistan are given. It has been established that mobile communications should be a heterogeneous (heterogeneous) architecture. Also, it must have a variety of access networks that could operate in any frequency ranges.

Telecommunication systems and high-speed railway transport networks

2017 ◽  
pp. 28-46
Author(s):  
Andrey Kanayev ◽  
Andrey Pryvalov ◽  
Vladimir Kotov ◽  
Arkadiy Lebedinskiy ◽  
Pavel Plekhanov ◽  
...  
Keyword(s):  
Control System ◽  
Information Security ◽  
Cyber Security ◽  
High Speed ◽  
Telecommunication Networks ◽  
Theory Approach ◽  
Railway Transport ◽  
High Speed Railway ◽  
Study Results ◽  
The Given

Objective: To consider the main approaches to organization of systems and communication networks on high-speed railway transport and provide cyber security on the basis of current international and home practice in the given sphere. Methods: Game-theory approach, hierarchy analysis method as well as topological transformation of stochastic networks were applied in the given study. Results: It was detected that a single realization of organizational and technical measures on cyber security cannot provide strong security from threats of cyber security during a long period of time; the latter is connected with constant development of data infrastructure, modification of methods, as well as the methods of attacks, potential attacker opportunities and other factors. Telecommunication networks’ security (TKS) of OJSC “Russian railways” and high-speed railway lines (VSM) from cyber impact is a systemic problem, for the solution of which fundamental research studies are to be conducted, aimed at the detection of basic patterns of information confrontation and directions of TKS cyber security provision and, subsequently, research and development activities for creating an automated communication control system of OJSC “Russian railways” and VSM, the constituent part of which is a subsystem of TKS information security. It is advisable to create an expert council based at regional transport universities, which provide extensive analysis conduct of systems and means of providing information security offered by the industry, as well as cyber security of OJSC “Russian railways” and VSM critically important systems including TKS. Practical importance: The realization of the suggested approach to OJSC “Russian railways” and VSM cyber security provision will make it possible to form the conditions for safe functioning of elements of information infrastructure, provide the creation, effective functioning and the improvement of cyber security control system, as well as to minimize damage from possible attack attempts.

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