Efficient Utilization of Spectral Mask in OFDM Based Cognitive Radio Networks

Cognitive Radio (CR) is used to access the unused licensed spectrum by the unlicensed users. While accessing the licensed spectrum by CR user’s radiation or signals of Cognitive radio users interfere and disturb the licensed user signal. This problem can be rectified by constructing a spectrum mask across the CR users, which eliminates the Out of Band radiation of CR users. In this paper we propose a method to restrict Cognitive Radio signals within the Spectral mask and proposed new techniques for efficient utilization of spectral mask in Cognitive Radio Networks. Our simulation results show that the Out of band radiation is within the spectral mask without reducing the BER and our proposed techniques will reduce the computational complexity in the Network.