Physical layer security in heterogeneous ad hoc networks with full-duplex receivers

In this chapter, we study the benefits of full-duplex (FD) receiver jamming. It enhances the physical layer security of a two-tier heterogeneous wireless ad hoc network, in which each tier is deployed with a large number of pairs of a single-antenna transmitter and a multiple-antenna receiver. The receivers in the underlying tier work in the half-duplex (HD) mode and those in the overlaid tier work in the FD mode. We provide a comprehensive performance analysis and network design under a stochastic geometry framework. Specifically, we consider the scenarios where each FD receiver uses single- and multiple-antenna jamming, and analyze the connection probability and the secrecy outage probability of a typical FD receiver with accurate expressions and more tractable approximations provided. We further determine the optimal density of the FD tier that maximizes network-wide secrecy throughput subject to constraints including the given dual probabilities and the network-wide throughput of the HD tier. Numerical results are demonstrated to verify our theoretical findings, and show that network-wide secrecy throughput is significantly improved by properly deploying the FD tier.