WiMAX Role on CBTC Systems

2007 ◽  
Author(s):  
Marina Aguado ◽  
Oscar Onandi ◽  
Eduardo Jacob ◽  
Christian Pinedo ◽  
Purificacion Saiz ◽  
...  
Keyword(s):  
Control Systems ◽  
Mobile Technology ◽  
Network Architecture ◽  
Communication Systems ◽  
High Speed ◽  
Transmission Rate ◽  
Discrete Event ◽  
Multipath Fading ◽  
Low Latency ◽  
Mobile Telecommunications

The recent progresses in mobile telecommunications technologies have allowed railway telecommunications technology to go a step forward, and, in the same way, the railway control systems. In this sense, while the mobile telecommunications technology evolved from the first generation of analogue mobile communication systems to what is known today as B3G (Beyond 3G), the same occurred with the telecommunication systems used in railways, from those based on analogue telecommunications, to the most recent ones based on 2G such as GSM-R or TETRA. Till recently, there was a technological gap regarding high mobility environments, high transmission rate and high interactivity (low latency). However, new emerging telecommunications technologies have shortened this gap significantly. This way, the train control systems will be affected by the availability of telecommunications technologies capable of offering earth-train broadband communications in real time. This article presents a telecommunications network architecture based on WiMAX (Worldwide Interoperability for Microwave Access) mobile technology (IEEE 802.16e) that fulfils the telecommunications needs in the railway environment. The WiMAX mobile technology most relevant features are: transmission rates up to 30Mbps at 15 km distance; mobility support up to 200km/h; QoS, security, low latency, fast, scalable and cost effective deployment, mainly compared to GSM-R deployment. In the mobile node design of this network telecommunications architecture, the multipath fading effect, and the Doppler effect, present in high speed mobility scenarios, have been taken into account. An improvement in the handoff between BSs, through a neighbouring and predictive mobility algorithm, is included. The architecture proposed supports the functional and system requirements identified in the UIC Project EIRENE (European Integrated Railway Radio Enhanced Network), and demanded to GSM-R technology. Measures on a real testbed and a model developed with the discrete event simulation tool, Opnet, have been employed in this work.

scholarly journals Laser technologies of data transfer in aquatic environment in the organization of underwater wireless communication networks

2021 ◽  
pp. 80-85
Author(s):  
В.Л. Мартынов ◽  
В.И. Дорошенко ◽  
Н.М. Божук ◽  
Ю.Г. Ксенофонтов
Keyword(s):  
Communication Networks ◽  
Optical Communication ◽  
Aquatic Environment ◽  
Communication Systems ◽  
High Speed ◽  
Data Transfer ◽  
Open Systems ◽  
Transmission Rate ◽  
Video Data ◽  
Optical Communication Systems

Решению вопросов, связанных с телекоммуникационным оборудованием, функционирующем в водной среде, в настоящее время уделяется особое внимание. На смену традиционным подводным системам обмена информацией в гидроакустических полях приходят открытые системы её оптической передачи и приёма, базирующиеся на лазерных технологиях. Это вызвано необходимостью трансляции с высокой разрешающей способностью видеоданных, среди которых, например, может быть либо визуальное отображение подводных систем в динамике, либо результаты мониторинга объектов подводной инфраструктуры в реальном масштабе времени, либо что-то другое с учётом требований Заказчика. Канал передачи такого большого объёма информации при условии ее считывания с задаваемым качеством должен иметь пропускную способность более 1 Мбит/с. Такую высокую скорость передачи невозможно реализовать в подводных гидроакустических системах, граница технических возможностей которых на превышает 10...50 кбит/с. В аналогичной ситуации при заданных параметрах канала связи частоты несущих оптического диапазона имеют порядок 1014 Гц, что обеспечивает динамический диапазон полосы пропускания в районе 1012…1013 Гц. С учётом условия квазимонохроматичности применение гидроакустических средств для передачи видеоданных становится проблематичным, так как техническая реализация такой задачи потребует слишком большого времени. С учётом сказанного, преимуществом подводных беспроводных оптических систем связи является их высокая широкополосность, которая обеспечит высокую скорость передачи данных. В статье обосновывается целесообразность использования открытых оптических системы связи для создания высокоскоростных подводных инфотелекоммуникаций, среди которых наиболее предпочтительными являются лазерные системы. Special attention is currently paid to the solution of issues related to telecommunication equipment operating in the aquatic environment. The traditional underwater systems for the exchange of information in hydroacoustic fields are being replaced by open systems for its optical transmission and reception, based on laser technologies.This is due to the need to broadcast high-resolution video data, among which, for example, there can be either a visual display of underwater systems in dynamics, or the results of monitoring objects of underwater infrastructure in real time, or something else, taking into account the requirements of the Customer. The transmission channel of such a large amount of information, provided it is read with a specified quality, must have a bandwidth of more than 1 Mbit / s. Such a high transmission rate cannot be realized in underwater sonar systems, the technical capabilities limit of which does not exceed 10 ... 50 kbit/s. In a similar situation, given the parameters of the communication channel, the carrier frequencies of the optical range are 1014 Hz, which provides a dynamic bandwidth range about 1012…1013Hz. Taking into account the condition of quasimonochromaticity, the use of hydroacoustic means for transmitting video data becomes problematic, since the technical implementation of such a task will take too long. In view of the above, the advantage of underwater wireless optical communication systems is their high broadband, which will provide a high data transfer rate. The article substantiates the expediency of using open optical communication systems for creating high-speed underwater information telecommunications, among which the most preferable are laser systems.

Prospects for the Application of the Global High-speed, Low Latency Broadband Satellite Internet in the Field of Road Transport

2021 ◽  
pp. 254-264
Author(s):  
Anatoliy Soltus ◽  
◽  
Maksym Rud ◽  
Keyword(s):  
Antenna Arrays ◽  
Communication Systems ◽  
High Speed ◽  
Electromagnetic Compatibility ◽  
Emerging Market ◽  
Satellite Communications ◽  
Road Transport ◽  
Unmanned Vehicles ◽  
Low Latency ◽  
Current State

The article examines the problems of navigation and communication with the use of satellite technologies in road transport in the context of the growth of globalization processes in the world economy and the transformations of freight transport technologies caused by a large-scale transition to transport with zero emissions and the development of unmanned vehicles. The paper discusses the principles of building a global high-speed broadband satellite Internet with low latency. Potential capabilities of technologies such as digital antenna arrays and laser communication channels used in such systems are analyzed. Also considered are the existing and potential problems, both technical with electromagnetic compatibility with existing satellite communication systems and between systems under construction or planning, and legal caused by changes in the principles of information transfer at the interstate level. The main players in the emerging market of high-speed satellite communications are considered and the parameters of the systems declared by them are described. The comparison of the current state of building satellite constellations of individual projects is carried out and the ability to implement the announced plans by individual companies is analyzed. The disadvantages that create obstacles for the introduction of high-speed satellite communications in road transport at the moment and the directions of their overcoming are highlighted. Considering the potential of satellite Internet systems, the current state of construction, as well as existing technical and legal restrictions, the introduction of reliable satellite communications will significantly speed up the transition to autonomous unmanned vehicles. In this regard, the most successful opportunities for the new communication technology will be able to realize the transport companies, which will simultaneously update the fleet of vehicles towards zero emissions and with unmanned technologies.

scholarly journals Future integrated communication network architectures enabling heterogeneous service provision

2018 ◽  
Vol 16 ◽  
pp. 59-66
Author(s):  
Paul Arnold ◽  
Dirk von Hugo
Keyword(s):  
Network Architecture ◽  
Communication Systems ◽  
Service Providers ◽  
High Reliability ◽  
Base Stations ◽  
Network Function Virtualization ◽  
Low Latency ◽  
Use Case ◽  
Main Concept ◽  
On Demand

Abstract. This paper summarizes expectations and requirements towards future converged communication systems denoted by 5th Generation (5G). Multiple research and standardization activities globally contribute to the definition and specification of an Information and Communication Technology (ICT) to provide business customers and residential users with both, existing and future upcoming services which demand for higher data rates and granted performance figures in terms of QoS parameters, such as low latency and high reliability. Representative use case families are threefold and represented as enhanced Mobile Broadband (eMBB), massive Internet of Things (mIoT), and Critical Communication, i.e. Ultra-Low Latency (ULL)/Ultra-High Reliability (UHR). To deploy and operate a dedicated network for each service or use case separately would raise the expenses and service costs to an unduly high amount. Instead provision of a commonly shared physical infrastructure offering resources for transport, processing, and storage of data to several separated logical networks (slices) individually managed and configured by potentially multiple service providers is the main concept of this new approach. Beside a multitude of other initiatives the EU-funded 5G NORMA project (5G Novel Radio Multiservice adaptive network Architecture) has developed an architecture which enables not only network programmability (configurability in software), but also network slicing and Multi Tenancy (allowing independent 3rd parties to offer an end-to-end service tailored according to their needs) in a mobile network. Major aspects dealt with here are the selectable support of mobility (on-demand) and service-aware QoE/QoS (Quality of Experience/Service) control. Specifically we will report on the outcome of the analysis of design criteria for Mobility Management schemes and the result of an exemplary application of the modular mobility function to scenarios with variable service requirements (e.g. high-terminal speed vs. on-demand mobility or portability of devices). An efficient sharing of scarce frequency resources in new radio systems demands for tight coordination of orchestration and assignment (scheduling) of resources for the different network slices as per capacity and priority (QoS) demand. Dynamicity aspects in changing algorithms and schemes to manage, configure, and optimize the resources at the radio base stations according to slice specific Service Level Agreements (SLAs) are investigated. It has been shown that architectural issues in terms of hierarchy (centralized vs. distributed) and layering, i.e. separation of control (signaling) and (user) data plane will play an essential role to increase the elasticity of network infrastructures which is in focus of applying SDN (Software Defined Networking) and NFV (Network Function Virtualization) to next generation communication systems. An outlook towards follow-on standardization and open research questions within different SDOs (Standards Defining Organizations) and recently started cooperative projects concludes the contribution.

scholarly journals SPREAD SPECTRUM TECHNOLOGY RESEARCH AND ITS APPLICATION IN POWER LINE COMMUNICATION SYSTEMS

T-Comm ◽  
2020 ◽  
Vol 14 (10) ◽  
pp. 45-52
Author(s):  
Edgar M. Dmitriyev ◽  
◽  
Eugeny V. Rogozhnikov ◽  
Andrey K. Movchan ◽  
Semyon M. Mukhamadiev ◽  
...  
Keyword(s):  
Data Transmission ◽  
Spread Spectrum ◽  
Communication Systems ◽  
High Speed ◽  
Transmission Rate ◽  
Power Lines ◽  
Transmission Systems ◽  
Data Transmission Rate ◽  
High Data ◽  
Speed Data Transmission

In the presented article, the results of the research of the spreading spectrum technology are given and its use in communication systems based on the data transmission over power lines is considered. One of the currently existing problems of data transmission systems over power lines is the absence of a compromise solution in ensuring the required data transmission rate and communication range. Ready-made solutions existing on the market provide either high data transmission rates over short distances or a communication long-range with rates not exceeding several tens of kilobits per second. The purpose of the article is to research the application of spread spectrum technology in data transmission systems over power lines. In the course of the experiment, it was found that the joint use of OFDM technology and the spread spectrum technology makes it possible to form a solution that provides communication over power lines over a distance of tens of meters with a data transmission rate of at least 5 Mbps. This article compares the TP-Link 500 Mbps modem for broadband high-speed data transmission, and the NWEPLC-1-G3M modem for narrowband low-speed data transmission. The results of modeling a communication system with different lengths and types of spreading sequences for BPSK and QPSK modulations are presented. An assessment of the interference protection was carried out. The results of an experimental research of the spectrum spreading technology on a model of a data transmission system over power lines in terms of range and transmission rate in comparison with existing devices on the market are presented. The results obtained can be used in the design of communication systems over power lines.

A Framework for High-Speed Passenger Train Wireless Network Radio Evaluations

2019 ◽  
Author(s):  
Subharthi Banerjee ◽  
Michael Hempel ◽  
Naji Albakay ◽  
Pejman Ghasemzadeh ◽  
Hamid Sharif
Keyword(s):  
Wireless Network ◽  
Network Architecture ◽  
Communication Systems ◽  
High Speed ◽  
Network Performance ◽  
The United States ◽  
Base Station ◽  
Simulation Framework ◽  
Passenger Train ◽  
Past Experiences

By 2030, the United States Federal Transit Administration (FTA) plans to have High Speed Train (HST) systems deployed that span over 12,000 miles across the US. Given the rapidly accelerating growth in consumers demand for fast on-board Internet services, there is a need for a robust and dedicated railroad wireless network architecture for their onboard and Train-to-Ground (T2G) communication systems. And while there are several potential candidates for radio access technologies (RAT), a full understanding of the benefits and drawbacks of each is still missing. We therefore have developed and studied a simulation framework that offers railroads the ability to perform an in-depth evaluation of capabilities for different RATs in terms of interoperability, throughput, handover and bit error rate for various user-driven scenarios. The framework is capable of studying and analyzing conditions such as network performance at different train velocities, base station spacing requirements, as well as analyzing US-specific geographical or track-related architectural scenarios. Our Past experiences in researching railroad wireless solutions have shown that wireless network performance varies widely in environments like tunnels, viaducts, bridges, stations, etc. The simulator offers the network designers significant flexibility in terms of defining parameters to create simulation scenarios and obtaining a detailed understanding of network performance. The work has created a novel, flexible and adaptable simulation framework for high-speed passenger train wireless network evaluation. The simulation tool supports 220MHz-100GHz systems for simulating LTE and 5G-New Radio (5G-NR), and it can support other technologies such as 220MHz PTC, in a time-variant channel. In this paper we present the architecture and the capabilities of the simulator with a sample scenario evaluation. The developed framework aims to support HST wireless communication designers to conduct more detailed analyses and to make more informed decisions in optimizing system deployments.

Improving OFDM Carrier Frequency Synchronization Using Cyclic Prefix

2013 ◽  
Vol 411-414 ◽  
pp. 779-783
Author(s):  
Ju Peng Zhang ◽  
Ming Jiang Wang
Keyword(s):  
Carrier Frequency ◽  
Communication Systems ◽  
Orthogonal Frequency Division Multiplexing ◽  
High Speed ◽  
Multipath Fading ◽  
Cyclic Prefix ◽  
Packet Transmission ◽  
Frequency Synchronization ◽  
Carrier Frequency Synchronization ◽  
Improved Algorithm

Orthogonal Frequency Division Multiplexing (OFDM) is the key technology of high speed communication systems which are widely used today. Small carrier frequency offset can make OFDM system performance fell sharply. So it needs very effective carrier frequency synchronization to make sure that the system works perfect. Seen from a large number of simulations, typical algorithm requires strict symbol timing. According to this characteristic, we proposed an improved carrier frequency synchronization algorithm using cyclic prefix. The improved algorithm can achieve better performance than typical algorithm in multipath fading channel. The precision of the improved algorithm under the same Signal Noise Ratio (SNR) is about 3 orders of magnitude higher than typical algorithm. We found that improved algorithm has more excellent performance in burst packet transmission mode.

scholarly journals ANALYSIS OF TELECOMMUNICATION CHANNEL SPECTRAL CHARACTERISTICS WITH BLOCK CODING AT A CONSTANT SPEED OF THE MESSAGE SOURCE

2021 ◽  
pp. 55-61
Author(s):  
Leonid Uryvsky ◽  
Andriy Korniienko ◽  
Bohdan Shmigel
Keyword(s):  
Information Transmission ◽  
Communication Systems ◽  
High Speed ◽  
Communication Channel ◽  
Transmission Rate ◽  
Spectral Characteristics ◽  
Constant Speed ◽  
Message Source ◽  
Noise Tolerant ◽  
Source Reliability

Background. The direction of development of modern electronic communication systems tends to increase the speed of information transmission. In turn, increasing the speed requires the use of additional resources of the communication channel and tools to maintain the specified reliability of the transmission under limited conditions. But resources are not free. That is why there is a need to establish a relationship between the conditions for reliable transmission in high-speed channels and the spectral and energy parameters of the information transmission system. Objective. The purpose of the paper is to analyse and describe the effect of block noise-tolerant coding on the rate of transmission of symbols in the communication channel while ensuring the required reliability of information transmission at a constant speed of the message source by increasing the frequency involved. Methods. The initial stage of the study is the presentation of system parameters in case of inaccurate transmission. Then a block redundant code is synthesized, which ensures the reliability of information transmission and the procedure of spreading the spectrum at a fixed speed of the message source is performed. Results. Recommendations on the method of selecting coding parameters in the procedure of spreading the spectrum and provided that the speed of the message source is constant are formed. Conclusions. Analysis of the possibilities of noise-tolerant coding at different energies of the communication channel under conditions of increasing the channel transmission rate at a fixed speed of the message source. Keywords: speed; message source; reliability; noise immunity.

scholarly journals Use of the CANopen protocol in vibration control systems of rotary machines

2021 ◽  
Vol 270 ◽  
pp. 01002
Author(s):  
Oleg Kovalyov ◽  
Yurii Chebakov
Keyword(s):  
Vibration Control ◽  
Control Systems ◽  
Communication Systems ◽  
High Speed ◽  
Power Plants ◽  
Vibration Monitoring ◽  
Area Network ◽  
Technical Problems ◽  
Rotary Machines ◽  
Rotary Type

Currently, most accidents and disasters at power plants are associated with fatigue failure of machines, mechanisms and assemblies caused by vibration. To prevent real threats of man-made disasters, there is an urgent need for objective monitoring of the current technical condition of mechanisms without disassembling them, during operation, repair and adjustment. The article proposes to use innovative approaches in the design of reliable and high-speed communication systems for the control of diagnostics and vibration monitoring of rotary-type machines in the form of a high-level network protocol running on top of the physical interface CAN (Controller Area Network). The aim of the study is to develop proposals for the use of the CANopen protocol in vibration control systems for rotary-type machines. The authors of the article analyzed the causes of man-made accidents at energy enterprises, identified the goals and objectives of vibration control of rotary machines and substantiated the possibility of using the CANopen protocol in vibration control systems. This will allow the exchange of data between devices from different manufacturers and ensures the interchangeability of devices. Thus, the authors concluded that the use of the CANopen protocol in vibration control systems for rotary-type machines is a promising direction that allows engineers to solve the necessary technical problems using modern methods.

scholarly journals Coded Modulation and Impairment Compensation Techniques in Optical Fiber Communication

2021 ◽  
Author(s):  
Zhipei Li ◽  
Dong Guo ◽  
Ran Gao
Keyword(s):  
Optical Fiber ◽  
Communication Systems ◽  
High Speed ◽  
Transmission Rate ◽  
Optical Fiber Communication ◽  
Coded Modulation ◽  
Coherent Detection ◽  
Modulation Scheme ◽  
Fiber Communication ◽  
Modulation Format

This chapter deals with coded modulation and impairment compensation techniques in optical fiber communication. Probabilistic shaping is a new coded modulation technology, which can reduce transmission power by precoding, reduce bit error rate and improve communication rate. We proposed a probabilistic shaping 16QAM modulation scheme based on trellis coded modulation. Experimental results show that this scheme can achieve better optical SNR gain and BER performance. On the other hand, in order to meet the demand of transmission rate of next generation high speed optical communication systems, multi-dimensional modulation and coherent detection are sufficiently applied. The imperfect characteristics of optoelectronic devices and fiber link bring serious impairments to the high baud-rate and high order modulation format signal, causes of performance impairment are analyzed, pre-compensation and receiver side’s DSP techniques designed for coherent systems are introduced.

scholarly journals Performance Analysis of Associate Radix-2, Radix- 4 and Radix-8 based FFT using Folding Technique

2021 ◽  
Vol 9 (10) ◽  
pp. 1489-1494
Author(s):  
Pankaj Kumar Singh
Keyword(s):  
Mobile Communications ◽  
Communication Systems ◽  
Orthogonal Frequency Division Multiplexing ◽  
High Speed ◽  
New Technology ◽  
Data Communication ◽  
Multipath Fading ◽  
Ieee 802.16E ◽  
Multipath Fading Channel ◽  
Ieee 802.11A

Abstract : In recent years, as a result of advancing VLSI technology, Orthogonal Frequency Division Multiplexing (OFDM) has received a great deal of attention and has been adopted in many new generation wideband data communication systems such as IEEE 802.11a, IEEE 802.16e, HiPerLAN/2, Digital Audio/Video Broadcasting (DAB/DVB), and for 4G Radio mobile communications. This is because of its high bandwidth efficiency as the use of orthogonal waveforms with overlapping spectra. The immunity to multipath fading channel and the capability for parallel signal processing make it a promising candidate for the next generation mobile communication systems. The modulation and demodulation of OFDM based communication systems can be efficiently implemented with an FFT and IFFT, which has made the FFT valuable for those communication systems. The complexity of an OFDM system highly depends upon the computation of Fast Fourier Transform (FFT) algorithm. With the advent of new technology in the fields of VLSI and communication, there is also an ever growing demand for high speed processing and low area design. It is also a well-known fact that the multiplier unit forms an integral part of processor design. Due to this regard, high speed multiplier architectures become the need of the day.

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