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The NOTICE architecture is a new concept in Vehicular Ad-Hoc Networking (VANET) that aims at providing automated notification of traffic incidents on highways in order to reduce congestion and improve overall traffic safety. The basic component of NOTICE is a system of sensor belts that collect information from passing cars through a wireless radio link. An(More)
Cognitive Radio (CR) systems are expected to enable dynamic access to the frequency spectrum in future generations of wireless communication systems by allowing unlicensed secondary users (SU) to access licensed spectrum that is not actively used by licensed primary users (PU). Due to its simplicity, energy detection is a main approach to identify spectrum(More)
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(More)
Recently, Yan et al. [1] introduced NOTICE, a scalable, secure and privacy-aware architecture for the notification of traffic-related incidents, such as congestion and other similar events. NOTICE uses belts of piezo-electric elements embedded in the highways to detect variations in the characteristics of traffic flow. NOTICE uses very short-range wireless(More)
Cognitive radios (CR) are regarded as a viable solution to enabling flexible use of the frequency spectrum in future generations of wireless systems by taking advantage of spectrum holes, that is idle frequency bands not actively used by primary users (PU) for licensed transmissions. The actual utilization of a spectrum hole is determined by its duration(More)
In this paper we study distributed transmitter adaptation with limited feedback where a B-bit codebook known at both transmitter and receiver is used in the update process. Specifically, we discuss predictive vector quantization (PVQ) where the transmitter is updated incrementally using the codebook element which results in smallest distortion in sum(More)
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