Novel Noise Injection Scheme to Guarantee Zero Secrecy Outage under Imperfect CSI

Abstract

The paper proposes a novel artificial noise (AN) injection strategy in multiple input single output multiple-antenna-eavesdropper (MISOME) systems under imperfect channel estimation at the legitimate channel to achieve zero secrecy outage probability under any circumstance. The zero secrecy outage is proved always achievable regardless eavesdropper’s number of antennas or arbitrary location when the pair secrecy and codeword rates are chosen properly. Results show that when there is perfect channel state information, the zero-outage secrecy throughput increases with the transmit power, which is important for secrecy design. Additionally, analysis of secrecy throughput and secrecy energy efficiency gives further insight into the effectiveness of the proposed scheme.