On the Secrecy Performance of the K-User Cognitive Radio Network with Iterative Interference Alignment

Abstract

In this paper, we consider a cognitive K-user multi-input multi-output interference network in the presence of an eavesdropper and a partial-band jammer, where an iterative interference alignment technique is adopted in the primary network to minimize the interference leakage. For the proposed scheme, we first obtain the statistical properties of the signal-to-jamming-noise ratio (SNJR) by considering the partial band jammer. Thereafter, in order to quantify the secrecy performance of the proposed system, we derive new closed-form expressions for the average secrecy capacity and probability of positive secrecy. Finally, the numerical results which are validated with the aid of simulations show that the secrecy performance of the primary network can be deteriorated due to the adverse affects of partial band jammer.