Title:Frequency-agile multi-band quadrature sigma-delta modulator for cognitive radio: Analysis, design and digital post-processingAuthor(s):J. Marttila,  M. Allen,  Mikko ValkamaJournal:IEEE Journal on Selected Areas in CommunicationsISSN:1558-0008Page Reference:page 2222-2236, 15 page(s)Publishing:11/2013Volume:31Number:11

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