Cyclic Prefix (CP) Jamming Against Eavesdropping Relays in OFDM Systems

TL;DR

This paper proposes a novel OFDM transmission scheme that uses cyclic prefix jamming to disrupt eavesdropping relays, enhancing security in cooperative wireless networks by exploiting the FFT operation.

Contribution

It introduces a new secure OFDM method employing CP jamming to impair eavesdropper interception, addressing the lack of authentication in cooperative networks.

Findings

Jamming signal degrades eavesdropper interception effectiveness.

Part of the jamming signal must fall within the data portion to be effective.

Simulation results confirm the scheme's effectiveness in security enhancement.

Abstract

Cooperative communication has been widely used to provide spatial diversity benefits for low-end user equipments, especially in ad hoc and wireless sensor networks. However, the lack of strong authentication mechanisms in these networks leaves them prone to eavesdropping relays. In this paper, we propose a secure orthogonal frequency division multiplexing (OFDM) transmission scheme, where the destination node transmits a jamming signal over the cyclic prefix (CP) duration of the received signal. Simulation results verify that as long as at least a part of the jamming signal falls to the actual data portion of the eavesdropping relay, it spreads through all the data symbols due to the fast Fourier transformation (FFT) operation, resulting in degraded interception at the eavesdropper.