Spectrum Sensing techniques for Cognitive Vehicular Networks

Abstract

With the growing number of vehicles, millions of people are killed in road accidents every year around the globe.Also, traffic congestion and air pollution has led to poor quality of life.This has brought in the focus to improve road safety and traffic efficiency.Vehicular Adhoc Network also referred to as VANET is a vital application of Intelligent Transportation System (ITS) with enormous societal impact.Cooperative communication among the vehicles can make the driving experience safer and comfortable.But the major challenge for the effective deployment of Vehicular networks is the bandwidth allocated for VANET by Federal Communication Commission (FCC) gets insufficient during high traffic density scenarios which affects the transmission of safety messages.Cognitive Radio technology integrated with Vehicular Networks extends the spectral efficiency with Opportunistic Spectrum Access (OSA) and can improve the communications in emergency situations.Leasing additional spectrum outside of the Dedicated Short-Range Communications (DSRC) band can improve the performance of vehicular networks.This survey paper sheds light on the latest advancements that took place in Cognitive Vehicular Networks as well as current research challenges.