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چکیده
With the switch-over to digital television in February 2009, the UHF band will become available for unlicensed use, pending the final FCC rule and order. The incumbents that need to be protected are digital television and wireless microphone signals. Some of the key requirements for an unlicensed radio to operate successfully in this band are (i) the ability to quickly and robustly sense spectrum availability, (ii) MAC protocols that allow seamless multichannel operation, without any user intervention, and (iii) QoS guarantees in the face of channels becoming unavailable due to the appearance of incumbents. The Philips prototype demonstrates these features in a fully Cognitive Radio (CR) platform operating in the UHF television bands (Channels 21-51). The prototype senses, transmits and receives in the UHF band. The sensing algorithms detect television and wireless microphone signals down to -114 dBm. The MAC protocol is based on distributed beaconing and coordinated “quiet periods”. Keywords-Cognitive radio, sensing, MAC, beaconing, quiet periods, DTV, NTSC, wireless microphoness
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