Study on sensing techniques for cognitive radio network: A survey

The rapid growth of wireless systems have led to increased demand of the spectrum in the wireless services. The dynamic allocation of the wireless channel is one of the viable options which offer a great deal of scope to overcome several challenges. Cognitive Radio (CR) technology offers likelihood of dynamic allocation of spectrum by enabling unlicensed users to use the licensed spectrum in a proficient manner through dynamic spectrum access. Moreover cognitive radio facilitates spectrum sensing which detects the presence and absence of primary user in the licensed frequency band and allows the secondary user to use the unused spectrum of the primary user. Thus the present status of spectrum sensing is highlighted herein.