Quadrature Amplitude Modulation: A modulation technique that generates
four bits out of one baud. For example, a 600 baud line (600 shifts in the
signal per second) can effectively transmit 2,400 bps using this method. Both
phase and amplitude are shaped with each baud, resulting in four possible
patterns. Using two carriers out of phase by 90° and modulated by separate
signals.
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