Physical Layer Security of Outdated CSI Based CRN

Abstract

In this paper, an underlay spectrum sharing based cognitive wiretap channel with multiple primary users is considered. The secondary user transmitter communicates with a secondary user receiver in the presence of multiple eavesdroppers. The secondary transmitter is assumed to have multiple antennas and the secondary receiver and eavesdroppers are equipped with single antenna each. The eavesdroppers channel state information (CSI) is found to be outdated in our case. For the coordinated eavesdropping, we have derived the exact and asymptotic closed form expression for the secrecy outage probability. © 2018 IEEE.