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Secrecy Rates and Outage in Multi-User Multi-Eavesdropper Broadcast Channel

In this paper, we study the secrecy rate and outage probability in Multiple-Input-Single-Output (MISO) Gaussian broadcast channel at the limit of a large number of legitimate users and eavesdroppers. In particular, we analyze the asymptotic achievable secrecy rates and outage of a secondary user that is superposed on the transmission, when only statistical knowledge on the wiretap channels is available to the transmitter. Doing this, we improve on a previous result which handled the same setting, yet assumed the transmitter serves only a primary user. Herein, we show that a secondary user can be added without affecting the scaling law of the first.