Fouzia Boukour

Millimeter Wave Ultra Wide Band Short Range Radar Localization Accuracy

In the coming years, it is expected that long and short range road vehicle radars (LRR, SRR) will all operate at millimeter wave. In several regions of the world, a one GHz bandwidth was selected between 76 and 77 GHz for LRR. To obtain a very high distance resolution for applications like brakeassist and pre-crash, SRR need an even larger bandwidth. Hence, a 4 GHz bandwidth was allocated to provide precise radial range information of objects with a range separation of approximately 5 cm to 10 cm. Directions of the targets are obtained using two or more separate sensors associated to localization techniques. The purpose of this paper concerns a simulation and experimental evaluation of an impulse radio, ultra wide band (IR-UWB) vehicle localization system. In this context, different localization techniques (TDOA, TOA, DOA) will be evaluated in terms of position error for scenarios using three distant, separate sensors. Our objective is to evaluate an optimum technique as a function of the localization range. Simulation results will be compared to experimental results obtained in laboratory. These results will show the interest of coupling two of the following TOA, TDOA and DOA techniques, at different ranges. Keywords-Radar; Ultra Wide Band; Pulse; Ranging; Localization; Vehicle

Collision avoidance radar system using UWB waveforms signature for road applications

The concept of the intelligent car consists in equipping the vehicle with an optimum number of sensors such as radar, in order to perceive the environment which surrounds it, to ensure an automatic guidance control of the vehicle and to communicate with the external medium. In this paper, we propose to exploit the UWB technology for road radar applications, in order to profit from its inherent advantages (good range resolution, low power consumption, low price etc.). All exiting studies on UWB radar concerns essentially medical and military applications. The originality of this radar is its capacity to detect easily various obstacles and to give their signatures. This paper describes the used radar and presents an interesting study of the adapted UWB waveforms which allow location and signatures of different kind of obstacles detected in short ranges with a good resolution.

UWB Radar system for road anti-collision application

The inter-vehicles communication is becoming increasingly mandatory to improve the road safety and to allow a better transport management. The concept behind an intelligent vehicle consists in equipping this vehicle with an optimum number of sensors, in order to perceive the environment surrounding it and to ensure an automatic guidance control and the communication with the infrastructure and other vehicles. Among the most often used tools for this objective, we can cite the embedded radar.

A New Multi-user Ultra Wide Band System Based on Modified Gegenbauer Functions and M-OAM Modulation for Communication of Intelligent Transportation Systems

Ultra-wideband technology is based on the transmission of very short pulses with relatively low energy, which make it a promising option for short range wireless communication system. In this paper, we propose to use this technology to establish a new multi-user technique dedicated to intelligent transport systems, especially vehicle-to-vehicle and vehicle-to-infrastructure communications. Indeed, the design of such system must provide good quality of service for a large number of users simultaneously and with high data rate. The proposed system is based on the use of a new modulation schemes named orthogonal amplitude modulation to reach high data rate; and an original multiple access technique that allows a maximum number of users simultaneously with good performances.

Impact of time reversal on UWB location system or train passenger

This preliminary paper deals with the impact of the Time Reversal (TR) processing on the performance of an Ultra Wide Band (UWB) location system. In a first part, we describe the topology of the UWB location system we have developed. In a second part, we present the enhancement of UWB radio channel characteristics by applying a TR algorithm. We have considered an impulse response of the (UWB) radio channel corresponding to severe propagation conditions: TR signal processing is described and its benefits on the characteristics of the UWB Channel Impulse Response (CIR) are detailed. A third part presents first results on the reduction of the error location due to UWB multipath propagation.

UWB regulatory compliant synchronization signal for indoor broadcast

Synchronization is an essential problem in numerous fields of application such as for communication and localization purposes. Emergent ultra wide band (UWB) technology based on impulse radio (UWB-IR) is currently investigated to broadcast synchronization signals in indoor environments, thus paving technically the way for the emergence of location based services. It considers that short duration pulses emission offer a high potential to recover reliable timing accuracy, but also to propagate efficiently in constraint environments. In this paper, we propose a basic signal structure implementation dedicated to multiple sources synchronization purposes. Main signal parameters influence will be covered and analyzed according to UWB current regulatory requirements. Based on an implemented overall transmission link and its regulatory compliant set of signal characteristics, radio coverage will then be evaluated.

Threshold of the symmetry property of cyclic autocorrelation function detector

Cognitive radio is one of the promising techniques that has been considered as a key solution addressing the spectrum scarcity challenge. It relies on three basic functions among which spectrum sensing is the most critical. In this paper, we study the test statistic of a recently proposed spectrum sensing algorithm, which is the symmetry property of cyclic autocorrelation function (SP-CAF) detector. The main objective of this work is to provide a function describing the threshold of the SP-CAF detector from the desired probability of false alarm. Different parameters of the detector are evaluated under the null hypothesis; simulations show that the key one is the number of lags which will be used to model the threshold.

Comparison of two coding technique dedicated to UWB V2V communication ystem

Transportation system become mere and more intelligent, and a new need of communication emerge. In order to share information collected by embedded sensors and join together more and more information. We can distinguish two kings of links, vehicles to vehicles V2V link and vehicles to infrastructure V2I. These vehicles will share different kinds of information with different priority, and different level of importance (security related or multimedia messages). Therefore the main constraints to develop an inter-vehicles communication system are data reliability and high data flow. This paper focus on developing new communications technique based on UWB technologies, associated to a new coding technique that offers high data rate and good performances in term of BER (Bit error rate). This technique proposes to establish communication link between vehicles or between vehicles and infrastructures with a high reliability to transmit security related information and a high data flow to exchange multimedia data. The performances, in term of BER against SNR, of this technique will be presented and a solution to.