Performance evaluation of coding-based cognitive radio for various packet sizes

This paper mostly concerned with the various packet size effect on performance of erasure correctable codes for cognitive radio. Among these types of codes we tried to simulate Raptor code to discover its suitability for assumed erasure channel in cognitive radio. The main target after supporting the functionality of coding-based cognitive radio would be finding the appropriate packet length that can result in best performance in overcoming secondary user´s packet loss in cognitive radio environment. We introduce this approach as an appropriate solution for transferring information in presence of primary users. In our simulation the role of primary users are played by wireless user which has specific packet size and variable traffic. Wireless LAN can be one suitable example of primary users among various communication environments. The appearance of wireless LAN packets in channel could be modeled by Poisson distribution and this means by finding this distribution´s parameters we are able to model the erasure channel which will erase secondary user´s packet due to carrier sense level of primary wireless LAN.