Spectrum sensing for Dynamic Spectrum Access networks in the 700-MHz UHF TV band using wavelets

Due to the transition to DTV, in early 2009 in the USA, the 700-MHz UHF band (channels 52 to 69) will be cleared of programming and set aside for bidding by wireless networks. In a framework of Dynamic Spectrum Access (DSA) networks, this paper presents a technique based on wavelet packet decomposition to locate ldquowhite spacesrdquo in the 700-MHz band. The combined use of opportune energy detection techniques as well as polyphase IIR filter banks allows achieving fast and accurate results.