  V2X communications plays a significant role in increasing traffic safety and
efficiency by enabling vehicles to exchange their status information with other
vehicles and traffic entities in their proximity. In this regard, two
technologies emerged as the main contenders for enabling V2X communications
which have stringent requirements in terms of latency and reliability due to
their apparent safety criticality. The first one is the DSRC standard (referred
to as ITS-G5 in Europe) that is well researched since 20 years and has attained
enough technical maturity for current deployment. The second one is the
relatively new CV2X standard that is nevertheless, based on the 3GPP standard
family that have successful deployments in almost every corner of the globe. In
this work, we compare the link level performance of the PHY protocols for both
the technologies for different vehicular fading channel models. To this end, we
construct and simulate the PHY pipelines and show the performance results by
means of BLER} versus SNR graphs. Our investigations show that CV2X performs
better than ITS-G5 for almost all the considered channel models due to better
channel coding and estimation schemes.
