QAM

Noun

Meaning

Initialism of quality assurance management.

Initialism of quality assurance manager.

Initialism of quality assurance manual.

Initialism of quadrature amplitude modulation.

Examples

Analog QAM suffers from the same problem as Single-sideband modulation : the exact phase of the carrier is required for correct demodulation at the receiver. Source: Internet

Analog QAM Analog QAM: measured PAL colour bar signal on a vector analyser screen. Source: Internet

Bit-loading (bits per QAM constellation) on an ADSL line Communication systems designed to achieve very high levels of spectral efficiency usually employ very dense QAM constellations. Source: Internet

Arbitrarily high spectral efficiencies can be achieved with QAM by setting a suitable constellation size, limited only by the noise level and linearity of the communications channel. Source: Internet

For example, hierarchical QAM is used in DVB, where the constellation points are grouped into a high-priority QPSK stream and a low-priority 16-QAM stream. Source: Internet

Expressions for the symbol-error rate of rectangular QAM are not hard to derive but yield rather unpleasant expressions. Source: Internet

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