Presentation Information
[B-15-03]A Study on Communication Data Embedding for Chirp Radar with Preserved Sensing Performance
◎Yoshimasa Kimoto1, Yoshimasa Egashira1 (1. Toshiba Corp.)
Keywords:
ISAC,Chirp,JRC
Integrated Sensing and Communication (ISAC), which realizes radar sensing and wireless communication with a single waveform, has attracted attention for next-generation wireless networks. Chirp signals are widely used in radars owing to their low Peak-to-Average Power Ratio (PAPR), low out-of-band emission, and high range resolution. As an ISAC waveform that adds a communication capability to existing chirp radars, FSK-Chirp, which divides a chirp pulse into subpulses and shifts the carrier frequency of each subpulse, has been proposed. However, it has two drawbacks: (i) after dechirping, the Doppler shift and the data are coupled in the same first-order phase term, so the Doppler estimation accuracy is strongly affected by the data demodulation accuracy; (ii) the instantaneous frequency is discontinuous at subpulse boundaries, which induces amplitude fluctuations after band-limiting filtering and increases the PAPR. Chirp-rate Hopping Modulation (CrHM), which assigns data to the chirp rate, has also been proposed, but it lacks a superposition structure with the reference chirp, and the dimensional separability between the Doppler and the data is not addressed. We propose CRM-Chirp, which superimposes chirp-rate modulation on a reference chirp while preserving subpulse-boundary frequency continuity, achieving both Doppler–data separation and low PAPR.