Performance Analysis of Deceiving HF Eavesdropping Systems with OFDM NOMA

This study investigates the enhancement in spectral efficiency in wireless networks through the application of Non-Orthogonal Multiple Access (NOMA), particularly within the context of imminent 5G networks. Despite its recognized potential, the application of NOMA in High-Frequency (HF) radio communications for eavesdropping mitigation has not been extensively explored. This paper introduces an innovative NOMA-based strategy for securing end-to-end radio communication against unauthorized interception. Utilizing NOMA’s distinctive capability, this methodology transmits a legitimate message at lower power, overlaid with a deceptive message in the same frequency band, thus effectively camouflaging the genuine communication from eavesdroppers. In our experimental setup, scaled mixed Orthogonal Frequency-Division Multiplexing (OFDM)-modulated waveforms were transmitted over varied distances. The findings demonstrate that under specific conditions, our NOMA-based system can successfully mislead eavesdropping systems, showcasing significant potential for enhancing security and privacy in HF radio communication settings. The experiments underscore the practicality of this approach, with the results indicating a noteworthy improvement in thwarting potential eavesdropping attempts, thereby confirming the theoretical model’s applicability in real-world scenarios.