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A new modelling method suited to the dual circular polarised 2×2 (MIMO) channel applicable to land mobile satellite (LMS) communications in line of sight cases is presented. In this scenario, it is necessary to apply correlated fading to the co-polarised and cross-polarised channels separately in order to model the evident polarization multiplexing in such channels found from measurement data. Comparisons...
This paper presents a novel navigation and motion planning algorithm for mobile vehicles in rough terrains. The main purpose of the algorithm is to generate feasible trajectories while selecting smoother paths, in the sense of level of roughness, toward the goal position. The purpose is achieved by adapting the passivity-based model predictive control optimization setup (PB/MPC), recently proposed...
Privacy and security are two important issues in vehicular networks. Users wish to maintain location privacy and anonymity, meaning the identity, location/direction of move of their vehicles remains unknown to everybody with possible exception law enforcement authorities responsible by law to know and maintain such private information. In this paper, we propose a Pre-broadcast based Time Efficient...
Road intersections represent one of the most complex configurations encountered when traversing road networks. A high percentage of accidents occur at these locations. The introduction of wireless communications technologies onboard passenger vehicles is enabling the sharing of information and through it enhancing the situational awareness of vehicle drivers. In this paper the implementation of safety...
Vehicular Ad-Hoc Networks (VANETs) are an important research area due to the potential benefits they could bring to traffic optimisation in urban environments. The communication protocols used within such networks, due to the intrinsic properties of such environments, reflect a series of characteristics which set them apart from common approaches. Routing messages, using a carry-and-forward strategy...
Providing Internet access on buses allow people to read news, check emails, watch sport games, and hence can greatly improve the quality of people's life. This paper proposes an adaptive routing protocol, called R-BUS for a bus network. R-BUS selects a route based on the link's lifetime and its communication signal quality. The protocol takes the bus mobility and the radio propagation model into account...
In this paper, we present a non-interactive authentication scheme providing privacy among drivers in vehicle-to-vehicle (V2V) communication networks. Where the drivers, who are members of V2V networks, are organized into groups. Each group has a shared public key between members. Additionally, each member has a private key provided by the Third Trusted Party (TTP). In our proposed scheme, we ensure...
Currently, the main purpose in car-to-car networks is to improve communication performance. In order to prove this, we need a tool to evaluate statistical values such as the number of vehicles that have received the information, time of reception of the message, etc. In this study, we demonstrate how it is possible to simulate real scenarios with car-to-car technology and evaluate all traffic parameters...
The next project is a two-dimensional positioning system of a vehicle. It is based on the usage of infrared sensors to detect and map the obstacles around it and thus to store in system memory a map of the surrounding area. For this purpose, working with the variables angle and distance is needed and to acquire the required information from these , a number of infrared sensors which are above the...
Inter-vehicle communication (IVC) network has become an important topic in research for its potential advantages in enhancing traffic security and efficiency. This paper investigates the communication performance of IVC networks in two lane bidirectional traffic streams. By changing the transmission range of communication units and penetration rate of equipped vehicles, we studied several performance...
In order to resolve the vehicles safe protection and monitoring tracing question, proposed GPS vehicle mobile information system's overall framework and corresponding function. This article analyzed information monitoring terminal's system components and detailed design. Combined monitoring system's communication transfer protocol, expounded vehicle navigation control system's components and key technologies...
Many countries in the developing world are currently affected by crises and security threats, including growing rates of regional instability, the proliferation of illegal drugs and weapons, cross border migration and increases to organized crime. It follows that public safety organizations in developing countries are faced with increasingly volatile environments-sometimes in absence of resources...
High throughput performance of the Wireless Access in Vehicular Environment (WAVE) system can provide more capacity for future high density traffic, which is little considered in the ongoing IEEE 802.11p/P1609.4 defined WAVE Medium Access Control (MAC) protocol. To achieve this goal, we propose a novel multi-channel MAC protocol that can use a dynamic time boundary instead of fixed boundary to separate...
Roadside units (RSUs) aided certificate service is a promising approach for ensuring security and privacy preservation in vehicular ad hoc networks (VANETs). In existing approaches, a vehicle can update certificate only when it passes by RSUs, however, this is impractical in many scenarios. Consequently, if there are no RSUs on the original driving trip, drivers have to adjust routes which means wasting...
Information Hovering is a relatively new concept of information dissemination over a mobile set of peers. It naturally applies in many applications in vehicular ad-hoc networks, where useful information needs to be made available to all vehicles within a confined geographical area for a specific time interval. A straightforward approach, is to have all vehicles within the hovering area exchange messages...
In this paper we investigate physical layer requirements for the NOTICE system proposed for notification of traffic incidents. The system uses short-range wireless communication between vehicles and sensor belts embedded in the roadway which impose constraints on time available for connection and data exchange, and we study the probabilities of establishing the wireless link and of successfully exchanging...
This paper describes an effective method for vehicle positioning estimation for range-based wireless network. The problem of locating a mobile terminal has received significant attention in the field of wireless communications. Time of arrival (TOA), received signal strength (RSS), time difference of arrival (TDOA) and angle-of-arrival (AOA) are commonly used measurements for estimating the position...
In this work, we examine the integration of vehicular sensing and urban sensing to assess the operation, performance and environmental impact of vehicles in urban settings. We have designed an integrated framework for vehicular and urban sensing. A prototype implementation of this framework has been developed by building a testbed based on campus shuttle buses. We discuss the design and implementation...
Rapid growth of personal communications has led to the development of many wireless systems, competing for radio bandwidth. In the vehicular environment, there is recognition of the importance of communications, and therefore the ability to model these channels is important. This paper addresses this issue through the exploration of both vehicle to roadside (VTR) and vehicle to vehicle (VTV) communications...
A real-time simulator for vehicle-to-vehicle (V2V) communication scenarios with a new integration method for the wireless network simulator NS-2 and the vehicular and traffic simulator (VATSIM) is introduced. Vehicular micro traffic networks with multiple intersections and vehicles using 802.11p communication are simulated and a collision warning system including a driver response model is investigated...
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