Date Added: Jul 2011
This paper evaluates the feasibility of overlaying a secondary system on a Digital TV (DTV) system. The authors denote this type of approach TV black space (in contrast to TV white space). In this type of operation the secondary transmitter transmits on the same spectrum resources as the DTV system. Particularly, they consider the case where the secondary transmitter is collocated with the DTV transmitter and uses the same antennas. The fraction of the total transmitted power that is used for the secondary signal is set low enough so that the DTV receivers are always able to decode the DTV signals.