Coexistence between communications and radar systems: A survey

Data-traffic demand in cellular networks has been growing tremendously, and has led to creating congested RF environments. Accordingly, innovative approaches for spectrum sharing have been proposed and implemented to accommodate several systems within the same frequency band. Spectrum sharing between radar and communications systems is one of the important research and development areas. In this paper, we present the fundamental spectrum-sharing concepts and technologies. We then provide an updated and comprehensive survey of spectrum-sharing techniques that have been developed to enable some wireless communications systems to coexist with radars in the same band.