Challenges of spectrum sensing techniques for cognitive radio

Spectrum is scarce resource and recent study observes that the static spectrum allocation scheme used in communication system is not as efficient as it should be. The dynamic allocation scheme become solution for efficient spectrum allocation and cognitive radio is suggested candidate for it. Cognitive radio senses the spectrum and learns to allocate the empty spectrum to secondary user without interfering to primary user of spectrum. The spectrum sensing plays important role in dynamic allocation of spectrum. This paper discusses the role of spectrum sensing techniques in cognitive radio and suggests implementable design requirement of cognitive radio for spectrum sensing algorithms.