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TV White Space (TVWS) refers to TV channels which are not used by any licensed services at a particular location and at a particular time. To exploit this unused TVWS spectrum for improved spectrum efficiency, regulatory agencies have begun developing regulations to permit use of this TVWS by unlicensed wireless devices as long as they do not interfere with any licensed services. In the future many heterogeneous, and independently operated, wireless networks may utilize the TVWS. Coexistencedoi:10.1109/mwc.2012.6155872 fatcat:lelovjoimjfshoesxkyoxb4a4q