Rate optimization under amplify-and-forward based cooperation with single eavesdropper

In this paper, we proposed a scheme, with which the transmitted signals at the eavesdropper node can be nulled out to avoid intercepting in the case of one eavesdropper. The amplify-and-forward (AF) based cooperative protocol is considered to form the transmission link. Assuming the globe channel state information is available at all the transmission nodes, we simulate the transmission system and show the secrecy rate of the proposed scheme. The simulation results show that the performance of the secrecy capacity of the proposed scheme is better than the bound method and the direct transmission.