Design and analysis of OFDM based CRAHN with common control channel

In wireless communication, the important factor to face its spectrum scarcity; to solve that scenario we are going to use the spectrum opportunistically. The Cognitive radio (CR) technology is defined to solve the problems in wireless networks resulting from the limited available spectrum and the inefficiency in the spectrum usage by sharing the existing wireless spectrum opportunistically. In cognitive radio ad hoc networks (CRAHNs), the distributed multi-hop architecture, the dynamic network topology, and the time and location varying spectrum availability are some of the key distinguishing factors. OFDM multicarrier communication technique is chosen in Cognitive Radio Networks due to its inherent capability of transmission and reception in variable bandwidth and in multiple chunks of subcarriers called sub channels. In this paper, non contiguous OFDM subcarriers placed within the dynamic guard bands based always-on, dedicated out-of-band common control channel (CCC) design is proposed for efficient spectrum utilization. Our proposed CCC design is to ensure the spectrum sharing, network connectivity, efficient data rate of CR users and dynamic guard bands when compared to cluster based and sequence based CCC design.