  This paper presents a spectrum sharing technology enabling interference-free
operation of a surveillance radar and communication transmissions over a common
spectrum. A cognitive radio receiver senses the spectrum using low sampling and
processing rates. The radar is a cognitive system that employs a Xampling-based
receiver and transmits in several narrow bands. Our main contribution is the
alliance of two previous ideas, CRo and cognitive radar (CRr), and their
adaptation to solve the spectrum sharing problem.
