Performance Analysis of Energy Efficient Power allocation for Secure OFDMA based Cognitive Radio Networks

In this paper, we are analyzing the performance of energy efficient power allocation for secure orthogonal frequency division multiple access (OFDMA) based cognitive radio networks (CRN‟s). The power allocation schemes are optimized for maximization of the energy efficiency [4] in secure data transmission. The nonconvex optimization problem takes into account to maximize the energy efficiency measured using the total throughput per Joule subject to the total transmit power and interference constraints. The nonconvex optimization problem is transformed into an equivalent convex optimization problem using by parametric programming method. The simulation results show that the proposed optimization algorithm can achieve higher energy efficiency, less bit error rate (BER) than that obtained by solving the original problem directly due to non convexity problem and also achieve a good tradeoff between rate channel capacity and interference threshold in cognitive radio networks.