Physical Layer Security in Heterogeneous Networks with Jammer Selection and Full-Duplex Users

TL;DR

This paper proposes a method to improve physical layer security in heterogeneous networks by using selective friendly jammers and full-duplex users, optimizing jammer activation for enhanced secrecy.

Contribution

It introduces a novel jammer selection scheme with a modified Poisson hole process model and a greedy algorithm for optimizing security and connection probability.

Findings

Theoretical expressions for connection and secrecy probabilities are derived.

The proposed jammer selection scheme improves security performance.

Numerical simulations confirm the effectiveness of the algorithm.

Abstract

In this paper, we enhance physical layer security for downlink heterogeneous networks (HetNets) by using friendly jammers and full-duplex users. The jammers are selected to transmit jamming signal if their interfering power on the scheduled users is below a threshold, meanwhile the scheduled users confound the eavesdroppers using artificial noise by full-duplexing. Using the tools of stochastic geometry, we derive the expressions of connection probability and secrecy probability. In particular, the locations of active jammers are modeled by a modified Poisson hole process (PHP). Determining the jammer selection threshold is further investigated for connection probability maximization subject to the security constraints. A greedy algorithm is proposed to efficiently solve this problem. The accuracy of the theoretical analysis and the efficiency of the proposed algorithm are evaluated by numerical simulations.