Method and apparatus for quadrature modulation

Details Method and apparatus for quadrature modulation Method and apparatus for quadrature modulation

1988-01-11

1989-03-28

LaRoche, Eugene R.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

332 48, 375 39, H03C 100

Patent

active

048167835

ABSTRACT:
A quadrature amplitude modulation system utilizes two subcarrier signals, each quadrature modulated with information signals which are quadrature modulated onto the RF carrier. This provides a hole in the center of frequency spectrum, permitting carrier and bit sync signals can be provided in the center area of the signal spectrum.

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patent: 4680777 (1987-07-01), Saha
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