WATCH: WiFi in Active TV Channels

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dc.citation.conferenceDate2015-06en_US
dc.citation.conferenceName16th ACM International Symposium on Mobile Ad Hoc Networking and Computingen_US
dc.citation.firstpage1en_US
dc.citation.journalTitleProceedings of the 16th ACM International Symposium on Mobile Ad Hoc Networking and Computingen_US
dc.citation.lastpage16en_US
dc.contributor.authorZhang, Xuen_US
dc.contributor.authorKnightly, Edward W.en_US
dc.date.accessioned2015-08-19T18:56:52Z
dc.date.available2015-08-19T18:56:52Z
dc.date.issued2015en_US
dc.descriptionNEWS COVERAGE: A news release based on this journal publication is available online: Rice tests wireless data delivery over active TV channels http://news.rice.edu/2015/07/13/rice-tests-wireless-data-delivery-over-active-tv-channels/en_US
dc.description.abstractToday's "white space" model of spectrum sharing applied in the UHF TV band allows channels that are not being used regionally by a TV broadcaster to be re-purposed for unlicensed-style secondary access in 24 hour increments. Unfortunately, populated areas have few unused channels for white space usage. Nonetheless, from the UHF TV viewer's perspective, Nielsen data show severe under-utilization of this spectrum, with vast regions that are in range of TV transmitters having no active TV receivers on multiple channels even at peak TV viewing times. In this paper, we present the design, implementation, and experimental evaluation of WATCH (WiFi in Active TV CHannels), the first system to enable secondary WiFi transmission even in the presence of kilowatt-scale TV transmitters, while simultaneously protecting TV receivers when they are active. To protect active TV receivers, WATCH includes a smartphone-based TV remote or an Internet-connected TV to inform the WATCH controller of TV receivers' spatial-spectral requirements. To enable WiFi transmission in UHF bands, we design WATCH-IC (Interference Cancellation) and CAT (Constructive Addition Transmission) to (i) exploit the unique environment of asynchronous WiFi transmission in the presence of a strong streaming interferer, and (ii) require no coordination with legacy TV transmitters. With FCC permission to test our implementation, we show that WATCH can provide at least 6 times the total achievable rate to 4 watt secondary devices compared to current TV white space systems, while limiting the increase in TV channel switching time to less than 5%.en_US
dc.identifier.citationZhang, Xu and Knightly, Edward W.. "WATCH: WiFi in Active TV Channels." <i>Proceedings of the 16th ACM International Symposium on Mobile Ad Hoc Networking and Computing,</i> (2015) Association for Computing Machinery: 1-16. http://dx.doi.org/10.1145/2746285.2746313.
dc.identifier.doihttp://dx.doi.org/10.1145/2746285.2746313en_US
dc.identifier.urihttps://hdl.handle.net/1911/81435
dc.language.isoengen_US
dc.publisherAssociation for Computing Machinery
dc.rightsThis is an author's peer-reviewed final manuscript, as accepted by the publisher. The published article is copyrighted by the Association for Computing Machinery.en_US
dc.subject.keywordspectrum re-useen_US
dc.subject.keywordTV white spaceen_US
dc.subject.keyworddatabase controlleren_US
dc.subject.keywordTV receiver feedbacken_US
dc.subject.keywordinterference cancellationen_US
dc.subject.keywordtransmit beamformingen_US
dc.titleWATCH: WiFi in Active TV Channelsen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpost-printen_US
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