Method and apparatus for quadrature modulation

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

H - Electricity

04

L

325/67, 332/76

H04L 27/34 (2006.01) H03C 3/40 (2006.01) H04L 27/36 (2006.01) H03D 7/16 (2006.01)

Patent

CA 1314080

ABSTRACT OF THE DISCLOSURE 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.

583330

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