@inproceedings{ZiMa11c, author = {Milan Zivkovic and Rudolf Mathar}, title = "Joint Frequency Synchronization and Spectrum Occupancy Characterization in {OFDM}-based Cognitive Radio Systems", pages = "1-6", booktitle = "{IEEE} Globecom 2011", address = {Houston, USA}, month = Dec, year = 2011, hsb = {hsb999910119774}, }