Safeguarding Decentralized Wireless Networks Using Full-Duplex Jamming Receivers

Abstract

In this paper, we study the benefits of full-duplex (FD) receiver jamming in\nenhancing the physical-layer security of a two-tier decentralized wireless\nnetwork with each tier deployed with a large number of pairs of a\nsingle-antenna transmitter and a multi-antenna receiver. In the underlying\ntier, the transmitter sends unclassified information, and the receiver works in\nthe halfduplex (HD) mode receiving the desired signal. In the overlaid tier,\nthe transmitter deliveries confidential information in the presence of randomly\nlocated eavesdroppers, and the receiver works in the FD mode radiating jamming\nsignals to confuse eavesdroppers and receiving the desired signal\nsimultaneously. We provide a comprehensive performance analysis and network\ndesign under a stochastic geometry framework. Specifically, we consider the\nscenarios where each FD receiver uses single- and multi-antenna jamming, and\nanalyze the connection probability and the secrecy outage probability of a\ntypical FD receiver by providing accurate expressions and more tractable\napproximations for the two metrics. We further determine the optimal deployment\nof the FD-mode tier in order to maximize networkwide secrecy throughput subject\nto constraints including the given dual probabilities and the network-wide\nthroughput of the HD-mode tier. Numerical results are demonstrated to verify\nour theoretical findings, and show that network-wide secrecy throughput is\nsignificantly improved by properly deploying the FD-mode tier.\n