quadrature amplitude modulation

quadrature amplitude modulation
   In communications, a data-encoding technique used by modems. Quadrature amplitude modulation is a combination of phase and amplitude change that can encode multiple bits on a single carrier signal. For example, the CCITT V.42bis standard uses 4 phase changes and 2 amplitudes to create 16 different signal changes.
   See also trellis-coded modulation.

Dictionary of networking . 2014.

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  • Quadrature amplitude modulation — (QAM) (Pronounced IPA|kwa:m) is a modulation scheme which conveys data by changing ( modulating ) the amplitude of two carrier waves. These two waves, usually sinusoids, are out of phase with each other by 90° and are thus called quadrature… …   Wikipedia

  • Quadrature amplitude modulation — Modulation d amplitude en quadrature La modulation d amplitude en quadrature (en anglais, Quadrature Amplitude Modulation ou QAM) est une forme de modulation d une porteuse par modification de l amplitude de la porteuse elle même et d une onde en …   Wikipédia en Français

  • Quadrature Amplitude Modulation — Quadrature Amplitude Modulation,   QAM …   Universal-Lexikon

  • Quadrature amplitude modulation — Quadraturamplitudenmodulation (Abkürzung: QAM, engl: Quadrature Amplitude Modulation) ist eine Modulationsart in der elektronischen Nachrichtentechnik, die Amplitudenmodulation und Phasenmodulation miteinander kombiniert. Dabei werden derselben… …   Deutsch Wikipedia

  • quadrature amplitude modulation — kvadratūrinis amplitudės moduliavimas statusas T sritis automatika atitikmenys: angl. quadrature amplitude modulation vok. Quadraturamplitudenmodulation, f rus. квадратурная амплитудная модуляция, f pranc. modulation d amplitude en quadrature, f …   Automatikos terminų žodynas

  • quadrature amplitude modulation — noun 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… …   Wiktionary

  • quadrature amplitude modulation — A modulation system involving phase and amplitude modulation of a carrier, used in microwave and satellite communication links …   Dictionary of automotive terms

  • quadrature amplitude modulation — …   Useful english dictionary

  • Amplitude modulation — Passband modulation v · d · e Analog modulation AM · …   Wikipedia

  • Pulse-amplitude modulation — Principle of PAM: (1) original signal, (2) PAM signal, (a) amplitude of signal, (b) time Pulse amplitude modulation, acronym PAM, is a form of signal modulation where the message information is encoded in the amplitude of a series of signal… …   Wikipedia

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