FILTERING IN A RECEIVER THAT USES LOG-POLAR SIGNAL PROCESSING

摘要

A log-polar digital filter for processing a digitized log-polar signal that is a magnitude signal (rin) and an angle signal (PHIin), has a first converter for converting the log-polar signal into a converted linear Cartesian signal that includes an in-phase signal (Iin) and a quadrature signal (Qin). A linear Cartesian digital filter, coupled to the first converter, generates a filtered linear Cartesian signal from the converted linear Cartesian signal. The first converter may adapt a linearization of rin and compensate for gain errors introduced in an analog circuit that supplies a signal from which the digitized log-polar signal is derived. In another feature, a second converter may also be provided for converting the filtered linear Cartesian signal into a filtered log-polar signal that includes a filtered magnitude signal (rfilt) and a filtered angle signal (PHIfilt).