Methods and apparatus for implementing modulators and programmab

Details Methods and apparatus for implementing modulators and programmab Methods and apparatus for implementing modulators and programmab

1998-10-14

2000-02-29

Grimm, Siegfried H.

Modulators

Phase shift keying modulator or quadrature amplitude modulator

375261, 375298, 708313, 708316, 708319, H04L 2720, H04L 2736

Patent

active

060314311

ABSTRACT:
Methods and apparatus for implementing digital modulators and programmable interpolation circuits used in such modulators are described. In one embodiment a modulator is implemented using an programmable interpolator which performs both pulse shaping and interpolation functions followed by a mixer which, in turn, is followed by a band shifting interpolator which operates at a fixed interpolation rate. By using the programmable interpolator/Nyquist filter of the present invention, multiple input sampling frequencies can be supported with the need to make the band shifting interpolator programmable. In addition, pulse shaping and interpolation operations are combined leading to a more efficient overall modulator design.

REFERENCES:
patent: 5633893 (1997-05-01), Lampe et al.
patent: 5783974 (1998-07-01), Koslov et al.
patent: 5930299 (1999-07-01), Vannatta et al.

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