What does quadrature amplitude modulation mean?

Definitions for quadrature amplitude modulation
quad·ra·ture am·pli·tude mod·u·la·tion

Here are all the possible meanings and translations of the word quadrature amplitude modulation.

Wiktionary

  1. quadrature amplitude modulationnoun

    A modulation scheme that conveys data by applying amplitude modulation to two carrier waves at once. These two waves, usually sinusoids, are out of phase with each other by 90° and are thus called quadrature carriers. Commonly abbreviated QAM.

Freebase

  1. Quadrature amplitude modulation

    Quadrature amplitude modulation is both an analog and a digital modulation scheme. It conveys two analog message signals, or two digital bit streams, by changing the amplitudes of two carrier waves, using the amplitude-shift keying digital modulation scheme or amplitude modulation analog modulation scheme. The two carrier waves, usually sinusoids, are out of phase with each other by 90° and are thus called quadrature carriers or quadrature components — hence the name of the scheme. The modulated waves are summed, and the resulting waveform is a combination of both phase-shift keying and amplitude-shift keying, or of phase modulation and amplitude modulation. In the digital QAM case, a finite number of at least two phases and at least two amplitudes are used. PSK modulators are often designed using the QAM principle, but are not considered as QAM since the amplitude of the modulated carrier signal is constant. QAM is used extensively as a modulation scheme for digital telecommunication systems. 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.

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Numerology

  1. Chaldean Numerology

    The numerical value of quadrature amplitude modulation in Chaldean Numerology is: 2

  2. Pythagorean Numerology

    The numerical value of quadrature amplitude modulation in Pythagorean Numerology is: 9

Images & Illustrations of quadrature amplitude modulation

  1. quadrature amplitude modulationquadrature amplitude modulationquadrature amplitude modulationquadrature amplitude modulationquadrature amplitude modulation

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