Covert Symbol Embedding via Chirp Signals for Integrated Sensing and Communications

Wireless research is increasingly moving toward Integrated Sensing and Communication (ISAC), which unifies radar and communication on a shared platform to improve spectral efficiency and reduce hardware costs. In this talk, we present a covert communication framework for Frequency-Modulated Continuous Wave (FMCW) radar systems that embeds binary symbols directly into the radar chirp. By selectively activating or suppressing transmissions at predefined time–frequency locations, information is encoded without disrupting core radar functionality. A synchronized receiver decodes the embedded bits based on energy detection, enabling low-overhead control signaling without requiring additional spectrum. The proposed scheme is compatible with existing FMCW hardware and introduces a stealthy communication layer with minimal impact on range estimation and resolution. Analytical and simulation results demonstrate reliable bit recovery, and a USRP-based software-defined radar prototype validates feasibility under practical SNR conditions. This work highlights covert embedding as a lightweight pathway toward practical ISAC systems for automotive, defense, and IoT applications.
Speaker(s): , Shiwen
Av. Eugenio Garza Sada 2501 Sur, Col. Tecnologico, Monterrey, Nuevo Leon, Mexico, 64849