Review of cooperative spectrum sensing methods for optimization of energy and delay

Today growth of wireless applications and number of users is exponential and with fact of finite availability of spectrum; spectrum scarcity, congestion, loss of signal quality are important issues in wireless communication. Spectrum Sensing and secondary use of spectrum is a upcoming solution for spectrum scarcity, but Spectrum Sensing creates burden on energy consumption as well as time limits of wireless nodes. This paper addresses about factors affecting on Cooperative Spectrum Sensing and review of techniques used to optimize delay and energy consumption.