In multicast communication scenario, the desired users are decomposed into M groups to receive private M useful data from the\ntransmitter, while eavesdroppers (Eves) group tries to intercept. Since wireless security system consists of authentication and\nsecure transmission, we propose directional modulation (DM) artificial noise (AN) matrix-aided Costas sequence (CS) matrix\nfrequency diverse array (FDA) in multicast precoding systems in this paper. Specifically, we utilize the CS matrix for desired\ngroups authentication (i.e., group identity), and it is shared via a low-speed forward link in advance. Next, we design AN matrixaided\nFDA to offer robust antieavesdropping method based on leakage concept. Furthermore, we devise secrecy metrics, namely,\nsecrecy outage probability (SOP), asymptotic Eveâ??s detectability error probability, and average useful data leakage rate, based on\nthe scenario where Eveâ??s instantaneous channel state information (CSI) is unavailable. In addition, we numerically analyze the\nproposed energy beamforming focusing and evaluate the secrecy energy efficiency. Via simulation results, the proposed scheme\ngives important insights into how to design and measure secrecy performances in multicast scenarios.
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