Recognition of available TV channels for TVWS using SDR devices

Owing to the transition of analogue to digital television, certain channels, that were used as guard to avoid interferences between the transmissions, are now unused. These channels are a potential medium of transmission for TVWS to bring Internet to remote areas where it's tough to install cable. To fulfil that TVWS becomes a reality, a database able to determine the unused channels in the UHF and VHF spectrum is needed. This paper focusses in creating an application that determines the channels available for TVWS, using USRP of NI controlled by LabVIEW and prove with measurements done in Bogotá corroborated with a Ranger.