On Secrecy Rates and Outage in Multi-User Multi-Eavesdroppers MISO Systems

TL;DR

This paper analyzes the asymptotic secrecy rates and outage probabilities in large-scale MISO wiretap channels with many users and eavesdroppers, using only statistical channel knowledge.

Contribution

It provides exact expressions for secrecy rate reduction and increase in large-scale MISO systems with multiple users and eavesdroppers.

Findings

Secrecy rate decreases as eavesdroppers increase.

Secrecy rate improves with more legitimate users.

Derived exact formulas for asymptotic secrecy metrics.

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.