Efficient spectrum sensing approaches based on waveform detection

Spectrum Sensing problem is a major problem in any smart radio transmission system (i.e. Cognitive or Smart Radio). This manuscript deals with this problem by proposing two major contributions: At first, a new contribution, consists on a new developing of setting of the comparison threshold basing on new decision criterion. In second contribution we use the Waveform techniques in order to detect the existing or not of Primary user´s signals(The Primary User is the user who holds the license or the right to use spectrum bandwidth)while a secondary user (an opportunistic user, who would like to use the licensed spectrum bandwidth) is transmitting. It is worth noticing that existing methods require a silence period of secondary users in order to sense the activity of the primary user. Our simulation results corroborate the two proposed approaches. Simulation results are presented and discussed.