Software Defined Radio: Advancement to Cognitive Radio and Basic challenges in Spectrum Sensing
Vikash Kumar, Nataraj Urs H D, R Venkata Siva Reddy
Reva Institute of Technology and Management, Rukmini Knowledge Park, Kattigenahalli, Yelahanka, Near Border Security Bustop, Bengaluru, Karnataka-560064, India.
Software Defined Radio, is an architecture in which the components like modulator/demodulator, mixer, amplifier, coder/decoder are Implemented on software as a replacement for hardware. This paper presents the evolution of CR from an SDR. Due to the increase in wireless communication applications, the electromagnetic frequency spectrum is getting busy in a non uniform way. The solution to above problem is Cognitive Radio Technology. Cognitive Radio is a device which senses the frequency spectrum to detect the white space on frequency spectrum. These white spaces are called as spectral holes and they can be used by the secondary users when primary users are in idle state. This whole criteria of sensing the frequency spectrum is called as Spectrum Sensing. Spectrum sensing and basic challenges in spectrum sensing are also discussed in this paper.