Method and apparatus for re-modulation using zero IF

Details Method and apparatus for re-modulation using zero IF Method and apparatus for re-modulation using zero IF

2005-01-18

2005-01-18

Mis, David (Department: 2817)

Modulators

Phase shift keying modulator or quadrature amplitude modulator

C375S259000, C375S261000, C455S039000, C455S042000, C455S071000

Reexamination Certificate

active

06844787

ABSTRACT:
The present invention provides for a first modulation at an arbitrary frequency and a second modulation at another arbitrary frequency. To achieve this, the present invention demodulates the first modulation using the same reference oscillator signal that was used in the first modulation. Because modulation and demodulation are achieved using the same reference oscillator signal, a close approximation of the original signals is achieved. With this close approximation, a subsequent re-modulation can be readily achieved at a second arbitrary frequency and can further be achieved using low-cost synthesizer and modulation components. In effect, a first modulation is achieved at a first frequency; the first modulation is then demodulation to zero frequency; and, in turn, a second modulation (i.e., re-modulation) is achieved at a second frequency.

REFERENCES:
patent: RE31295 (1983-06-01), Haley et al.

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