Multi-Hop Multi-Environment Relay Assisted CRNs

A relayed transmission model of multi hop cognitive radio system is introduced. Objective of this paper is to minimize the outage probability while satisfying the total power constraint and interference threshold for primary user(PU) and also the signal-to-interference and noise ratio. Network life of cognitive radio network is also considered using the concept of battery life to improve the overall capacity of the cognitive radio(CR).Overall Capacity of secondary user(SU) is calculated from the subcarrier allocation between source and destination of secondary user. Convex optimization and Linear Programming based approaches are carried out in this scheme. In addition, classical schemes are compared with proposed scheme. Extensive simulations have been performed for both energy aware and non-energy aware scheme to obtain a better overall capacity, reduced interference.