noun[mass noun] Telecommunications
A modulation system used in microwave and satellite communication, involving phase and amplitude modulation of a carrier wave.
- A quadrature amplitude modulation trellis coded modulation decoder for decoding a stream of QAM TCM signals is disclosed.
- An SCM modulator uses the digital component to create a low-order QAM (quadrature amplitude modulation) symbol.
- Because Ultraband utilizes ITU-grade QAM (quadrature amplitude modulation), it requires lower plant noise floors.
Definition of quadrature amplitude modulation in:
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