Digital transmission system

Details Digital transmission system Digital transmission system

1995-10-31

1998-08-18

Chin, Wellington

Pulse or digital communications

Transmitters

Quadrature amplitude modulation

375295, 332103, 455 23, 455 42, H04L 2709

Patent

active

057967830

ABSTRACT:
A waveform generating system generates one or more quadrature amplitude modulated (QAM) spectrum pairs which are combined with a frequency modulated (FM) spectrum in the center. The QAM spectrums are offset in frequency to result in a gap in the center to allow combining of the FM spectrum without interference.

REFERENCES:
patent: 5222103 (1993-06-01), Gross
patent: 5251232 (1993-10-01), Nonami

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