ScholarWorks@중앙대학교

초록

In this paper, we propose a method to mitigate interference from phase-modulated continuous-wave (PMCW) signals in frequency-modulated continuous-wave (FMCW) systems. In dense automotive sensing environments, PMCW signals enter FMCW receivers and produce broadband distortions after dechirping, which degrades target detectability. To address this issue, we exploit the distinct characteristics of the FMCW signal and the PMCW-induced interference. Specifically, the FMCW signal exhibits a low-rank property in the Hankel domain, whereas the PMCW-induced interference spreads over multiple scales in the wavelet domain due to its chip-wise phase modulation. Based on these properties, we formulate an optimization problem that enforces a low-rank representation for the FMCW signal and applies wavelet-domain regularization to represent the PMCW-induced interference. To efficiently solve this problem, we adopt a solver based on the alternating direction method of multipliers. This solver updates the FMCW signal under a low-rank constraint in the Hankel domain and separates the PMCW-induced interference in the wavelet domain. Simulation results demonstrate that the proposed method outperforms conventional interference mitigation methods, with significant noise floor reduction in the range–velocity map and improved target detectability. As a result, the proposed method achieves a signal-to-interference-plus-noise ratio of 13.151 dB and a correlation coefficient of 0.9651 under strong interference.

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