Physical Layer Security in a SISO Communication using Frequency-Domain Time-Reversal OFDM Precoding and Artificial Noise Injection

TL;DR

This paper introduces a frequency-domain time-reversal precoding scheme with artificial noise injection for physical layer security in SISO OFDM systems, enhancing secrecy without compromising legitimate communication.

Contribution

It proposes a novel FD TR precoder with artificial noise for PLS in SISO OFDM systems, including optimal decoding structures and power allocation strategies.

Findings

The scheme guarantees secrecy with known legitimate CSI and unknown eavesdropper CSI.

Closed-form AN energy expressions optimize secrecy rate.

Simulation confirms improved security performance.

Abstract

A frequency domain (FD) time-reversal (TR) precoder is proposed to perform physical layer security (PLS) in single-input single-output (SISO) systems using orthogonal frequency-division multiplexing (OFDM) and artificial noise (AN) signal injection. The AN signal does not corrupt the data transmission to the legitimate receiver but degrades the decoding performance of the eavesdropper. This scheme guarantees the secrecy of a communication towards a legitimate user when the transmitter knows the instantaneous channel state information (CSI) of the legitimate link thanks to the channel reciprocity in time division duplex (TDD) systems, but does not know the instantaneous CSI of a potential eavesdropper. Three optimal decoding structures at the eavesdropper are considered in a fast fading (FF) environment depending on the handshake procedure between Alice and Bob. Closed-form approximations of the AN energy to inject in order to maximize the SR of the communication are derived. In addition, the required conditions at the legitimate receiver's end to guarantee a given SR are determined when Eve's signal-to-noise ratio (SNR) is infinite. Furthermore, a waterfilling power allocation strategy is presented to further enhance the secrecy of the scheme. Simulation results are presented to demonstrate the security performance of the proposed secure system.