Secure spatial multiple access using directional modulation

WOS: 000422945400041In this paper, we introduce a secure multiple access scheme, which exploits the multipath structure of the channel to create a multi-user interference environment. The generated interference enables legitimate users to share time and frequency resources over spatially secure communication links. Utilizing directional modulation, we ensure secrecy for legitimate users against eavesdropping while preserving mutual confidentiality between the legitimate users themselves. Moreover, we introduce a complementary scheme for covering the non-selective channel case. The scheme uses directional modulation in coordinated multi-point transmission to provide location-specific secure communication to legitimate users. We characterize the achievable performance using a newly defined metric called vulnerable region. We provide analysis for the achievable secrecy rate, secrecy outage probability, and channel correlation effect on the secrecy performance for the proposed scheme. Furthermore, the effect of the channel spatial diversity, channel estimation error, and the number of legitimate users on the secrecy performance is studied.National Science Foundation [ECCS-1247503]; Scientific and Technological Research Council of Turkey [114E244]; Qatar National Research Fund, QNRF [NPRP 7-923-2-344]This work was supported in part by the National Science Foundation under Grant ECCS-1247503 and in part by the Scientific and Technological Research Council of Turkey under Grant 114E244. The work of M. Hafez and T. Khattab was supported by the Qatar National Research Fund, QNRF (a member of the Qatar Foundation, QF) under Grant NPRP 7-923-2-344