On secrecy rates and outage in multi-user multi-eavesdroppers MISO systems

Abstract

Abstract-In this paper, we study the secrecy rate and outage probability in Multiple-Input-Single-Output (MISO) Gaussian wiretap channels at the limit of a large number of legitimate users and eavesdroppers. In particular, we analyze the asymptotic achievable secrecy rates and outage, when only statistical knowledge on the wiretap channels is available to the transmitter.The analysis provides exact expressions for the reduction in the secrecy rate as the number of eavesdroppers grows, compared to the boost in the secrecy rate as the number of legitimate users grows.

On the Asymptotic Performance Analysis of the k-th Best Link Selection Over Non-Identical Non-Central Chi-Square Fading Channels

“…We assume that γ E,m follows the non-central chi-square distribution with CDF as given in (1) 6 . Now, in the presence of multiple eavesdrop-pers, secrecy is always defined with respect to the strongest eavesdropper [29], [51]- [53]. Hence, we are interested in characterizing the statistics of the maximum eavesdropper SNR defined as…”

Secure Transmission for Hierarchical Information Accessibility in Downlink MU-MIMO

“…of ( 5) is the maximum rate among the wiretapping users, i.e., the users in the layers that has no right to decode 𝑠 𝑘 . This is because, in the presence of multiple non-colluding eavesdroppers, no eavesdropper can decode a message when the strongest eavesdropper cannot decode it [9], [12], [21]. For this reason, the required redundancy to protect 𝑠 𝑘 is determined by the maximum rate among all the eavesdroppers, i.e., the users in the layers ℓ < 𝑘. Consequently, in the non-colluding case, the HIA condition is fulfilled when the information rate of 𝑠 𝑘 is set as Rnc 𝑘 in (5).…”