Filtering in a receiver that uses log-polar signal processing

Details Filtering in a receiver that uses log-polar signal processing Filtering in a receiver that uses log-polar signal processing

1995-11-22

1999-06-22

Vo, Don N.

Pulse or digital communications

Receivers

Interference or noise reduction

375235, 3647242, H04B 110

Patent

active

059149906

ABSTRACT:
A log polar digital filter for processing a digitized log polar signal that is a magnitude signal (r.sub.in) and an angle signal (PHI.sub.in), has a first converter for converting the log polar signal into a converted linear Cartesian signal that includes an in-phase signal (I.sub.in) and a quadrature signal (Q.sub.in). 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 r.sub.in 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 (r.sub.filt) and a filtered angle signal (PHI.sub.filt).

REFERENCES:
patent: 5048059 (1991-09-01), Dent
patent: 5533064 (1996-07-01), Ichihara
patent: 5668837 (1997-09-01), Dent

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