Systolic arrays architecture for computing the time-frequency spectrum

To solve the problem of detecting and displaying the changes in the spectrum of nonstationary signals, there are two possible approaches. Either, one uses the same estimators as for the stationary signals but with shorter length data blocks during which it is assumed to be stationary, or one can use the same length data and apply a time-varying (TV) spectrum estimator which accounts for the non-stationarity. A TV spectrum estimator called timevarying correlogram (TVC) is a well known estimator of the time-frequency (TF) spectrum of a non-stationary signal. In this paper, a VLSI architecture for computing the TVC is proposed.