Method for digital quadrature amplitude modulation

Details Method for digital quadrature amplitude modulation Method for digital quadrature amplitude modulation

1984-03-30

1986-10-14

LaRoche, Eugene R.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

332 9R, 332 31R, H03C 100, H03D 100

Patent

active

046175377

ABSTRACT:
Spectrum-converting digital filters are employed for quadrature amplitude modulation. Given the method of the invention, the frequency of the two carrier oscillations residing at 90.degree. relative to one another amounts to one-fourth the sampling frequency and, in addition, their phase positions relative to the sampling times is selected such that every second sample of both carrier oscillations is alternately zero.

REFERENCES:
patent: 4003002 (1977-01-01), Snijders et al.
patent: 4086536 (1978-04-01), Acker
patent: 4433310 (1984-02-01), Bic et al.
Ringelhaan et al., "Linear Modulation of Digital Signals with an Applied Example for Analog Equipment", NTG-Fachberichte, vol. 70, 1980, pp. 81-88.
Gockler, "Principles and Possible Applications of Digital Filters In Telecommunications Technology", in Frequenz 35(1981) 3/4, Section 3, pp. 71-73.

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