Efficient estimation of phase noise in FMCW system containing leakage signal

Highly efficient estimation of the phase noise is important for system optimization and signal processing in frequency modulated continuous wave system. Although many contributions investigate different technologies, almost all of them consider the input signal as a single-source signal without the leakage signal propagating from transmitter to receiver. In this paper, utilizing the signals correlation, we aim to estimate the phase noise when considering the leakage signal. For the correlation computation, the method combining the information geometry theory is proposed to avoid the complex determination of optimal lag in traditional approach. Differently, the statistical characteristics of signals are just the primary concerns. The results verify the excellent performance of our method. The mean estimated error reduces by 15.5% and the efficiency improves by 58.6%.