Securing MIMO Wiretap Channel with Learning-Based Friendly Jamming under Imperfect CSI

TL;DR

This paper introduces a deep learning-based friendly jamming framework for MIMO wireless systems that enhances security against eavesdroppers even with imperfect or no channel state information, optimizing secrecy and error rates.

Contribution

The paper proposes a novel autoencoder-based and MINE-based deep learning framework for friendly jamming that operates effectively without perfect CSI, improving wireless security in IoT devices.

Findings

Effective against eavesdropping with imperfect CSI

Achieves comparable security without CSI

Enhances throughput and reduces error rates

Abstract

Wireless communications are particularly vulnerable to eavesdropping attacks due to their broadcast nature. To effectively deal with eavesdroppers, existing security techniques usually require accurate channel state information (CSI), e.g., for friendly jamming (FJ), and/or additional computing resources at transceivers, e.g., cryptography-based solutions, which unfortunately may not be feasible in practice. This challenge is even more acute in low-end IoT devices. We thus introduce a novel deep learning-based FJ framework that can effectively defeat eavesdropping attacks with imperfect CSI and even without CSI of legitimate channels. In particular, we first develop an autoencoder-based communication architecture with FJ, namely AEFJ, to jointly maximize the secrecy rate and minimize the block error rate at the receiver without requiring perfect CSI of the legitimate channels. In addition, to deal with the case without CSI, we leverage the mutual information neural estimation (MINE) concept and design a MINE-based FJ scheme that can achieve comparable security performance to the conventional FJ methods that require perfect CSI. Extensive simulations in a multiple-input multiple-output (MIMO) system demonstrate that our proposed solution can effectively deal with eavesdropping attacks in various settings. Moreover, the proposed framework can seamlessly integrate MIMO security and detection tasks into a unified end-to-end learning process. This integrated approach can significantly maximize the throughput and minimize the block error rate, offering a good solution for enhancing communication security in wireless communication systems.