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The paper presents issues related to the cooperative transmission in wireless vehicular networks. Cooperative transmission involves the use of mobile terminals as relay stations to improve the transmission quality, improve network performance and reduce energy consumption. The paper presents the methods used to implement cooperative transmission and the types of cooperative networks.
Benefits of ITS systems implementation and functional configuration of ITS have been presented in article. Stakeholders aspirations, matrix of implementation of aspirations by the subsystems of ITS configuration, and high-level design in V-model of systems engineering have been presented as structure of ITS project. Description of comprehensive traffic and transportation studies for transportation...
This paper shows the strategy and results of the simulation of the Train integrity determination system into the on-board ETCS. It first shows the Smart Train Positioning System (STPS), a GNSS based on-board system that determines the the train integrity. Then, scenarios are derived for two different routes. After that, the test setup based on the ETCS on-board unit virtual laboratory is explained...
Intravehicular wireless systems are attracting a lot of research interest during the last years. A future scenario where intravehicular wired systems will be replaced by wireless systems will allow to reduce cabling weight and increase the flexibility. But one of the main requirements of wireless systems is to maintain the same reliability level as the wired ones. A system based on LDM (Layered Division...
An on-board Complementary Positioning System (CPS) has been proposed to overcome the limitation of GNSS positioning systems. This paper deals with the test phase of CPS to guarantee the localization functions in areas in which GNSS signals are not available. In order to analyze the suitability of CPS its performance in a railway operational line has been evaluated. The CPS is based mainly on GNSS,...
In the new era of “smart rail mobility”, infrastructure, trains, and travelers will be interconnected to achieve optimized mobility, higher safety, and lower costs. In order to realize a seamless high-data rate wireless connectivity, up to dozens of GHz bandwidth is required, and this motivates the exploration of the underutilized millimeter wave (mmWave) as well as the largely unexplored Terahertz...
In its initial part, the paper presents an overview of popular technologies and systems currently developed or employed in maritime communication. These solutions are used to provide both ship-to-ship and ship-to-shore communication for the purpose of supporting specific services, often dedicated to maritime safety and e-navigation. Utility of such communication systems have been thoroughly verified...
To estimate the degradation in transmission quality of communication system under pulse burst disturbance, we introduce statistical parameters of noise to the research, and establish a quantitative relationship between bit error rate (BER) and statistical parameters, such as amplitude probability distribution (APD) and pulse duration distribution (PDD). There has been a method to evaluate BER with...
For automotive safety applications, vehicles directly exchange periodic beacons that contain status information such as position, speed, acceleration, etc., and the application layer issues warnings if a hazardous situation is detected. The update rate of these beacons should be high enough to allow the application to swiftly react to prevent accidents and current recommendations provide fixed values...
Given the increasing interest for future connected vehicles, the long term evolution (LTE) specifications are being enhanced by 3GPP to cope with the vehicle-to-everything (V2X) scenarios starting from the upcoming Release 14, which will include, among others, vehicle-to-vehicle (V2V) direct communications. Since the main service expected for connected vehicles is the cooperative awareness, in this...
We introduce a sensor-aided predictive algorithm for Doppler-shift estimation and compensation in dynamic vehicular environments. The proposed concept uses sensor data to improve adaptation of V2V communication parameters to instantaneous channel states. The obtained results show that the use of vehicles' sensor data enables a range of improvements in direct vehicle-to-vehicle communications.
This paper introduces a multi-level cooperative scheme for autonomous vehicles, using the sensors equipped on-board and a communication scheme with the deployed infrastructures. The proposed model focuses on the communication elements, delving into the cooperative aspect between the network components. The first level of the proposed scheme is composed of a multi-sensor data fusion framework using...
This paper investigates the feedback delay effects on opportunistic relay selection strategy. The investigation considers a dual-hop multiple half/full-duplex two-way wireless relaying network in the system model. The selection strategy is based on the sum-rate of user-pair and related relay terminal. According to Monte-Carlo simulation results, sum-rate based relay selection strategy achieves cooperative...
We are developing a Pedestrian-Vehicular Collision Avoidance Support System (P-VCASS) in order to protect pedestrians from traffic accidents with vehicles. P-VCASS is a system that makes observations of pedestrian's moving situations. Drivers of neighboring vehicles are given warnings in advance if there is a possibility of collision between vehicles and pedestrians. Pedestrians moving around in an...
Cycling in cities can be dangerous and, therefore, routing applications for cyclists should consider road safety aspects in their route suggestions. Thereby, cyclists are able to avoid accident hot spots easily. However, designing and implementing such applications is only one part of the developing process. Additionally, a proper assessment is required in order to make sure road safety is improved...
It is important to develop pedestrians, convenience and safety for realizing ITS world. In recent years, navigation for pedestrians has been increased by spreading of smart phones. The GPS (Global Positioning System) is main stream to obtain user's position information outdoors. However, positioning quality is poor in urban area. Then, the positioning reliability becomes worse. We can point out the...
Channel modeling studies in vehicle-to-vehicle (V2V) communications have shown that larger road users act as blocking objects for the communication of surrounding vehicles, dramatically altering the statistical properties of the wireless channel. Without a strong line-of-sight component, packet delivery depends on other propagation mechanisms that are statistically more likely to add destructively...
Vehicular communications can be achieved through the infrastructure (Vehicle-to-infrastructure network, V2I), as well as directly through vehicle-to-vehicle communication (V2V) via ad hoc networks. In V2V communications, the routing protocols are designed in order to optimize the dissemination of messages. This paper presents an evaluation of routing protocols such as the Optimized Link State Routing...
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