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Cognitive radio is a new paradigm for wireless communications offering a solution to conciliate the current spectrum demand growth and underutilization without changes to the existing legacy wireless systems. Secondary users should be able to identify spatial and temporal spectrum holes not occupied by primary users and use them opportunistically, without generating interference to primary receivers. For that purpose, having knowledge of the primary network is required to ensure an appropriatedoi:10.1109/aict.2010.45 dblp:conf/aict/BoleaPAS10 fatcat:5wwe7yww3rcotajfhq3v54wogm