Channels Reallocation In Cognitive Radio Networks Based On DNA Sequence Alignment

Nowadays, It has been shown that spectrum scarcity increased due to tremendous growth of new playersin wireless base system by the evolution of the radio communication. Resent survey found that there aremany areas of the radio spectrum that are occupied by authorized user/primary user (PU), which are notfully utilized. Cognitive radios (CR) prove to next generation wireless communication system thatproposed as a way to reuse this under-utilised spectrum in an opportunistic and non-interfering basis. ACR is a self-directed entity in a wireless communications environment that senses its environment, trackschanges, and reacts upon its findings and frequently exchanges information with the networks forsecondary user (SU). However, CR facing collision problem with tracks changes i.e. reallocating of otherempty channels for SU while PU arrives. In this paper, channels reallocation technique based on DNAsequence alignment algorithm for CR networks has been proposed.