In this thesis the registration of TV receiver information in a database is introduced to utilize unused frequencies in the TV broadcasting band. The unused frequencies are split in the terms: White space and Gray space. By conducting simulations at three areas in Norway the amount of unused frequencies with focus on the Gray Space is found. The result is evaluated in regards to the level of information retrieved from each TV receiver. There are three knowledge levels evaluated: when the information changes from only knowing the available channels at a location, to having information on which broadcaster delivers TV service information at a household, and finally how the amount of Gray Space changes when knowing the TV usage in time. The available White Space and Gray Space amount is calculated considering a Cognitive radio with transmit power of 100mW and 4W.
Using realistic TV broadcast environments, the method of introducing an RX receiver database opens for 81-96 MHz of Gray Space in average when considering a Cognitive radio device with 4 W transmit power. This level increases to 109-115 MHz in average when considering a 100mW Cognitive radio device. These levels are present in addition to the White Space of about 200 MHz.