Fast algorithm for radio propagation modeling in realistic 3-D urban environment

Abstract. Next generation wireless communication systems will consist of a large number of mobile or static terminals and should be able to fulfill multiple requirements depending on the current situation. Low latency and high packet success transmission rates should be mentioned in this context and can be summarized as ultra-reliable communications (URC). Especially for domains like mobile gaming, mobile video services but also for security relevant scenarios like traffic safety, traffic control systems and emergency management URC will be more and more required to guarantee a working communication between the terminals all the time.

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Methods for improving the accuracy of frequency shift estimation in 5G NR

10.21203/rs.3.rs-397516/v1 ◽

2021 ◽

Author(s):

Vladimir Sergeevich Milyutin ◽

Eugeniy Vasilevich Rogozhnikov ◽

Kirill Petrovskiy ◽

Dmitriy Pokamestov ◽

Edgar Dmitriyev ◽

...

Keyword(s):

Frequency Shift ◽

High Frequency ◽

Communication Systems ◽

Wide Frequency Range ◽

Wireless Communication Systems ◽

Frequency Synchronization ◽

Frequency Range ◽

Transmission Rates ◽

Synchronization Accuracy ◽

High Order Modulation

Abstract Frequency synchronization is a necessary operation for all wireless communication systems. Due to the wide frequency range defined for 5G NR systems, this procedure becomes critical. To ensure high transmission rates and the use of high-order modulation, up to 256 QAM for 5G communication systems, it is necessary to ensure high frequency synchronization accuracy. In this article, we have reviewed various approaches to implementing frequency synchronization and proposed, in our opinion, the most effective method for correcting the frequency shift of the signal.

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Functional structure of the subway train traffic control system complex

Automation on Transport ◽

10.20295/2412-9186-2021-7-3-343-361 ◽

2021 ◽

Vol 7 (3) ◽

pp. 343-361

Author(s):

E. O. Averchenkov ◽

◽

L. A. Baranov ◽

M. A. Shevchenko ◽

◽

...

Keyword(s):

Energy Consumption ◽

Remote Control ◽

Control Systems ◽

Traffic Safety ◽

Traffic Control ◽

Minimum Energy ◽

Functional Structure ◽

Normal Operation ◽

Rolling Stock ◽

Emergency Situations

The main architectural aspects of metro train traffic control systems are presented. The structure of train traffic control processes is presented with the example of the State Unitary Enterprise “Moscow Metro” and the main tasks that need to be solved to achieve high levels of automation of train traffic control in subways are described. A functional structure of a complex of metro train traffic control systems is presented, covering the levels of organization and planning of train traffic, operational traffic control and direct executive systems. The relationship between objects of automation and remote control of train movement, devices of the operational level and systems of organization and planning of movement are shown. The necessity of re-equipping the metro with means of ensuring transport safety and linking them with traffic control systems such as: means of informing passengers, providing the possibility of promptly informing passengers both during normal operation of the transport system and in case of emergency situations, means of communication “passenger – control center (situation center)” is shown. The latter ensures interaction between passengers and operational personnel of the subway, and if necessary, video surveillance equipment that provides enhanced remote control of the current situation in the interior of rolling stock cars and on platforms. The use of complex systems for controlling the movement of trains in subways increases the efficiency of their use by increasing the throughput and carrying capacity, accurate fulfillment of the traffic schedule and the possibility of its rapid recovery in case of failures. At the same time, traffic safety increases by reducing the likelihood of dangerous train convergence , and also the energy consumption for train traction is reduced due to the choice of energy-optimal train control modes and the optimal distribution of travel time along the line by the criterion of minimum energy consumption for the duration of travel along the tracks

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Comparative study of four indoor empirical propagation models for campus wireless network

Jurnal Teknologi dan Sistem Komputer ◽

10.14710/jtsiskom.7.4.2019.154-160 ◽

2019 ◽

Vol 7 (4) ◽

pp. 154-160

Author(s):

Fransiska Sisilia Mukti

Keyword(s):

Wireless Networks ◽

Wireless Communication ◽

Comparative Study ◽

Relative Error ◽

Error Rate ◽

Communication Systems ◽

Wireless Communication Systems ◽

Propagation Models ◽

Propagation Modeling ◽

Modeling Analysis

Propagation is one of the important factors to understand in wireless communication systems. Prediction of the value of propagation, especially for closed areas, is very necessary to determine success in building wireless networks. Various kinds of propagation modeling were developed to find the best approach to calculate the value of signal losses. A comparative study of 4 types of empirical propagation modeling was made to provide the most suitable propagation modeling analysis for campus wireless networks. The ITU-R model (P.1238) provides predictive results that are closest to the actual data in the field, with a relative error rate of 16.381%.

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DEVELOPMENT OF THE METHOD OF CLUSTERIZATION OF TRAIN SITUATIONS

Collection of scientific works of the State University of Infrastructure and Technologies series Transport Systems and Technologies ◽

10.32703/2617-9040-2021-37-18 ◽

2021 ◽

Vol 1 (37) ◽

pp. 187-195

Author(s):

O. Gorobchenko

Keyword(s):

Finite Number ◽

Control Systems ◽

Traffic Safety ◽

Traffic Control ◽

Euclidean Distance ◽

Complex Shape ◽

Rolling Stock ◽

Number Of Classes ◽

Decisive Rule

The introduction of intelligent locomotive control systems requires better approaches to assessing and monitoring the current train situation than those used in modern traction rolling stock. Automatic detection of complex abnormal situations is currently not provided. For example, determining the inefficiency of the brakes, speeding, the presence of obstacles or people on the track, the deterioration of the traction properties of rolling stock, etc. relies solely on the driver of the locomotive. Given the important impact of these factors on traffic safety, it is proposed to include in the functions of automated and intelligent traffic control systems recognition of abnormal situations and notification of its occurrence. When driving a train, all objects of classification (train situations) are divided into a finite number of classes. A finite number of precedent objects are known and studied for each class. The task of pattern recognition is to assign a new recognizable situation to a class. The classifier or decisive rule is the rule of assigning the image of a train situation to one of the classes on the basis of its vector of features. An order of classification of train situations has been developed, which allows to allocate clusters of any complex shape, provided that different parts of such clusters are connected by chains of close to each other elements. The measure of difference is the square of the Euclidean distance.

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Approaches of chosen air navigation services providers to UAV integration into air traffic control systems

10.26552/pas.z.2021.2.26 ◽

2021 ◽

Author(s):

Peter Matúš ◽

◽

Matúš Materna

Keyword(s):

Great Britain ◽

Control Systems ◽

United Arab Emirates ◽

Traffic Control ◽

Air Traffic Control ◽

Communication Systems ◽

Air Traffic ◽

Visual Contact ◽

Potential Threat ◽

Air Navigation Services

In this article are approaches of Air Navigation Services (ANS) providers in chosen countries to UAV integration into Air Traffic Control Systems identified and described. Firstly we made a synpaper of theoretical information about ANS and UAV. Product of ANS providers has 11 parts. For UAV traffic control and management are important ATC, CNS, AIS, MET, ATFCM and ASM services. The volume of ANS provided depends on UAV operation development in the country, and on the level of integration of UAV into ATC systems. The biggest problem of UAV operation is the risk of collision with piloted aircraft, and potential threat of people and property on the ground. The biggest risk is during UAV operation close to airports, because there are many aircrafts flying in low altitudes (after take-off and on approach to landing). The consequences of collision in this altitudes in the most serious. Because of this, 4 ways to detect and 2 ways to mitigate an unauthorized UAV close to airport are currently in use. Various combinations of UAV detection and mitigation ways create complex airport UAV protection systems. Secondly, we chose 7 countries (Poland, Hungary, Germany, Great Britain, USA, India, and United Arab Emirates), and analysed their approaches to UAV integration. In all of the analysed countries can remote pilots use a mobile application, which allows them to create a flight plan, and receive all the information, necessary for the flight. Differences between these countries are for example if the permission in required for every UAV flight (in Hungary and India yes), if the ANS provider has an opportunity to watch UAV during flight (in Poland, India, and partly in Germany), if the UAV operation without direct visual contact between remote pilot and UAV is allowed (in Poland and Germany), and if are UAV operations included into airspace capacity management systems (in Poland, Hungary, Germany, and Great Britain). UAV integration process in next years will relate to development of communication systems between UAVs, between UAV and ATC, and between UAV and piloted aircraft. The process will also relate to development of technologies to avoid mid-air collisions.

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Development of the Train Traffic Regulation Method for “Rail Baltica” Line Based on the Implementation of the European Train Traffic Control Systems

Proccedings of 10th International Conference "Environmental Engineering" ◽

10.3846/enviro.2017.154 ◽

2017 ◽

Author(s):

Larisa Valentinovič ◽

Henrikas Sivilevičius

Keyword(s):

Control Systems ◽

Traffic Safety ◽

Traffic Control ◽

Positive Impact ◽

Primary Objective ◽

Regulation System ◽

Railway Network ◽

Traffic Lights ◽

Railway Traffic ◽

Traffic Regulation

This article focuses on analyzing the systems and methods used for the interval regulation of train movement on “Rail Baltica” line in “Lithuanian Railways”. The method discussed in the article can be viewed as a combination of several management automation solutions and it is based on the implementation of the European Railway Traffic Management System (ERTMS). As it is known, the ERTMS provides an interoperable European railway network. The primary objective is to improve the quality of train traffic and to make railway transport safer and more comfortable. In order to ensure new traffic prevision for Lithuanian Railways, new interval regulation methods and traction calculations must be used. This developed method is more useful than the previous methods as it allows to shape an efficiently automated and optimized scheduling process as well as to improve line capacity and efficiency. This paper proposes the development of a moving block train control system. The calculations were made using the intervals between trains. The interval and block-section borders are not fixed by traffic signs or traffic-lights. Instead, they move after the train in the front, creating a flexible interval regulation system. The results showed that the implementation of the method had a positive impact on the operators’ performance and allowed to reduce energy consumption and to increase the speeds of train movement. The paper also presents a statistical figure portraying railway accidents and railway operation accident reports before and after the implementation of the ERTMS. The results of the analysis showed that the implementation of the European Train Traffic control systems and the interval regulation of train movement method will provide high throughput and carrying capacity, traffic safety and also increase the productivity of operation procedures.

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Signal Propagation Models in Soil Medium for the Study of Wireless Underground Sensor Networks: A Review of Current Trends

Wireless Communications and Mobile Computing ◽

10.1155/2021/8836426 ◽

2021 ◽

Vol 2021 ◽

pp. 1-12

Author(s):

Frank Kataka Banaseka ◽

Ferdinand Katsriku ◽

Jamal Deen Abdulai ◽

Kofi Sarpong Adu-Manu ◽

Felicia Nana Ama Engmann

Keyword(s):

Sensor Networks ◽

Wireless Communication ◽

Communication Systems ◽

Electromagnetic Waves ◽

Signal Propagation ◽

Propagation Loss ◽

Wireless Communication Systems ◽

Soil Medium ◽

Propagation Modeling ◽

Operating Environments

Radio signal propagation modeling plays an important role in the design of wireless communication systems. Various models have been developed, over the past few decades, to predict signal propagation and behavior for wireless communication systems in different operating environments. Recently, there has been an interest in the deployment of wireless sensors in soil. To fully exploit the capabilities of sensor networks deployed in soil requires an understanding of the propagation characteristics within this environment. This paper reviews the cutting-edge developments of signal propagation in the subterranean environment. The most important modeling techniques for modeling include electromagnetic waves, propagation loss, magnetic induction, and acoustic wave. These are discussed vis-a-vis modeling complexity and key parameters of the environment including electric and magnetic properties of soil. An equation to model propagation in the soil is derived from the free space model. Results are presented to show propagation losses and at different frequencies and volumetric water content. The channel capacity and the operating frequency are also analyzed against soil moisture at different soil types and antenna sizes.

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