Secure Transmission Design of Millimeter-Wave Wiretap Channel with Guard Zone and Artificial Noise

Abstract

As one of the key technologies of the fifth generation communication, millimeter wave has abundant available bandwidth, which can meet the explosive growth of mobile data demand. In this paper, we study the problem of secure communication in a millimeter wave wiretap network. Two transmission protocols are designed to achieve the secure transmission in a sector zone. We give a comprehensive investigation of secrecy performance by analyzing each protocol in terms of secrecy outage probability (SOP), connection outage probability (COP) and secrecy throughput. Particularly, for the secrecy guard zone protocol, we analyze the influence of transmit power on secrecy performance and the results demonstrate that it is very important to set transmit power properly. For the secrecy guard zone protocol with artificial noise, in addition to analyzing the influence of transmit power on each performance metric, we also analyze the effect of transmit power allocation factor on the secrecy throughput, the results reveal that the power allocation of the AN and the information signal need to be properly set for increasing the secrecy throughput. Moreover, the influence of different millimeter wave frequency on the performance metric is also analyzed. Finally numerical results are provided to verify our theoretical analysis.