Sidelobe minimization in Orthogonal Frequency Division Multiplexing Using efficient Generalize Sidelobe Canceler

The optimal choice for the organized utilization of the radio spectrum is Cognitive Radio Network (CRN). To permit data of Secondary Users (SUs) opportunistically, in the absence of Primary Users (PUs) is the main objective of CRN. Due to its efficiency and easy implementation Orthogonal Frequency Division Multiplexing (OFDM) is employed in CRN for signaling. The drawback in using OFDM is its sidelobes that causes Out of Band (OOB) radiations, which results interference to the PU's. In order to reduce OOB radiations the signal pass through Modified Generalize Sidelobe Canceller (MGSC) in which optimization part of the adaptive weight vector of conventional Generalize Sidelobe Canceller (GSC) is done using Differential Evolution (DE). Furthermore, proposed work reduces time wastage and memory by calculating the weight of one sample point from left and right side of OFDM symbol using DE while applying the formula of sidelobe decay to calculate remaining weights of sidelobe. The effectiveness and consistency of our proposed technique can be seen in simulation. Better results has been achieved in comparison to the existing techniques by our proposed technique.