One of the mysteries of the English language finally explained.
A modulation system used in microwave and satellite communication, involving phase and amplitude modulation of a carrier wave.
- ‘Because Ultraband utilizes ITU-grade QAM (quadrature amplitude modulation), it requires lower plant noise floors.’
- ‘To avoid these problems, HomePlug uses a robust orthogonal frequency division multiplexing scheme with 1,280 orthogonal quadrature amplitude modulation carriers.’
- ‘An SCM modulator uses the digital component to create a low-order QAM (quadrature amplitude modulation) symbol.’
- ‘A quadrature amplitude modulation trellis coded modulation decoder for decoding a stream of QAM TCM signals is disclosed.’
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