Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal
Patent
1987-09-28
1989-03-14
Grimm, Siegfried H.
Modulators
Amplitude modulator
Nonlinear device controlled by modulating signal
332 21, 332 23R, 332 31R, H03C 500, H04L 2712, H04L 2720
Patent
active
048127868
ABSTRACT:
A method and system is disclosed which provides precise multi-function digitally implementable modulation for a communication system. The invention provides a modulation signal for a communication system in response to an input signal from a data source. A digitized time response is generated from samples of a time domain representation of a spectrum profile of a selected modulation scheme. The invention generates and stores coefficients for each input symbol in accordance with the selected modulation scheme. The output signal is provided by a plurality of samples, each sample being generated by summing the products of a predetermined number of the coefficients and a predetermined number of the samples of the digitized time response. In a specific illustrative implementation, the samples of the output signals are converted to analog signals, filtered and used to modulate a carrier in a conventional manner. The invention is versatile in that it allows for the storage of the digitized time responses and corresponding coefficient lookup table of a number of modulation schemes, any of which may then be selected for use in accordance with the teachings of the invention.
REFERENCES:
patent: 3958191 (1976-05-01), Jones, Jr.
patent: 4584540 (1986-04-01), DuBose et al.
Davarian Faramaz
Sumida Joe T.
Benman, Jr. William J.
California Institute of Technology
Grimm Siegfried H.
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