Knightly, Edward W.2016-01-072016-01-072014-122014-10-08December 2Zhang, Xu. "WATCH: Enabling WiFi in Active TV Channels." (2014) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/87788">https://hdl.handle.net/1911/87788</a>.https://hdl.handle.net/1911/87788"White space” model allows TV channels that are not being used regionally by a TV broadcaster to be re-purposed for secondary access. Unfortunately, populated areas have few these unused channels. Nonetheless, Nielsen data show severe under-utilization with vast regions in range of TV transmitters having no active TV receivers even at peak TV viewing time. In this thesis, I present the design, implementation, and evaluation of WATCH (WiFi in Active TV CHannels), the first system to (i) enable secondary WiFi transmission in the presence of kilowatt-scale TV transmitters by employing WATCH-IC (Interference Cancellation) and CAT (Constructive Addition Transmission); (ii) protect active TV receivers by employing their spatial-spectral requirements. With FCC permission to test WATCH implementation, I show that WATCH can provide at least 6.0 times the total achievable rate to 4 watt secondary devices compared to white space model, while increasing the TV channel switching time by less than 5%.application/pdfengCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.Spectrum re-useTV white spaceDatabase controllerTV receiver feedbackInterference cancellationTransmit beamformingThesis2016-01-07