Estimation of phase synchrony using the synchrosqueezing transform

Phase synchronization has emerged as an important concept in quantifying interactions between dynamical systems. In this work a robust estimate of the phase synchrony between bivariate signals is presented. This is achieved by extending the recently introduced synchrosqueezing transform (SST), a method that belongs to the class of reassignment techniques that generates highly localized time-frequency representations, so as to cater for bivariate data. The proposed method is shown to generate accurate estimates of phase synchrony on both synthetic and real world signals.