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• Quadrature_amplitude_modulation abstract "Quadrature amplitude modulation (QAM) is both an analog and a digital modulation scheme. It conveys two analog message signals, or two digital bit streams, by changing (modulating) the amplitudes of two carrier waves, using the amplitude-shift keying (ASK) digital modulation scheme or amplitude modulation (AM) 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 (PSK) and amplitude-shift keying (ASK), or (in the analog case) of phase modulation (PM) 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.QAM modulation is being used in optical fiber systems as bit rates increase; QAM16 and QAM64 can be optically emulated with a 3-path interferometer.".
• Quadrature_amplitude_modulation thumbnail PAL_colour_bar_signal_measured_vector_edit.png?width=300.
• Quadrature_amplitude_modulation wikiPageExternalLink qam_constellation_diagram_from_snr.
• Quadrature_amplitude_modulation wikiPageExternalLink QAM_defined.php.
• Quadrature_amplitude_modulation wikiPageExternalLink LDPC%20and%208-QAM.pdf.
• Quadrature_amplitude_modulation wikiPageExternalLink index.cfm?act=app_notes&notes=iqv_phaseshift.
• Quadrature_amplitude_modulation wikiPageExternalLink ANSISCTE072000DVS031.pdf.
• Quadrature_amplitude_modulation wikiPageID "25316".
• Quadrature_amplitude_modulation wikiPageRevisionID "604420985".
• Quadrature_amplitude_modulation hasPhotoCollection Quadrature_amplitude_modulation.
• Quadrature_amplitude_modulation subject Category:Data_transmission.
• Quadrature_amplitude_modulation subject Category:Radio_modulation_modes.
• Quadrature_amplitude_modulation type Abstraction100002137.
• Quadrature_amplitude_modulation type Attribute100024264.
• Quadrature_amplitude_modulation type Manner104928903.
• Quadrature_amplitude_modulation type Property104916342.
• Quadrature_amplitude_modulation type RadioModulationModes.
• Quadrature_amplitude_modulation comment "Quadrature amplitude modulation (QAM) is both an analog and a digital modulation scheme. It conveys two analog message signals, or two digital bit streams, by changing (modulating) the amplitudes of two carrier waves, using the amplitude-shift keying (ASK) digital modulation scheme or amplitude modulation (AM) analog modulation scheme.".
• Quadrature_amplitude_modulation label "Kwadratuur-amplitudemodulatie".
• Quadrature_amplitude_modulation label "Modulación de amplitud en cuadratura".
• Quadrature_amplitude_modulation label "Modulacja QAM".
• Quadrature_amplitude_modulation label "Modulation d'amplitude en quadrature".
• Quadrature_amplitude_modulation label "Modulação de amplitude em quadratura".
• Quadrature_amplitude_modulation label "Quadraturamplitudenmodulation".
• Quadrature_amplitude_modulation label "Quadrature amplitude modulation".
• Quadrature_amplitude_modulation label "Quadrature amplitude modulation".
• Quadrature_amplitude_modulation label "Квадратурная модуляция".
• Quadrature_amplitude_modulation label "تضمين مطالي رباعي".
• Quadrature_amplitude_modulation label "正交幅度调制".
• Quadrature_amplitude_modulation label "直角位相振幅変調".
• Quadrature_amplitude_modulation sameAs Kvadraturní_amplitudová_modulace.
• Quadrature_amplitude_modulation sameAs Quadraturamplitudenmodulation.
• Quadrature_amplitude_modulation sameAs Modulación_de_amplitud_en_cuadratura.
• Quadrature_amplitude_modulation sameAs Modulation_d'amplitude_en_quadrature.
• Quadrature_amplitude_modulation sameAs Modulasi_amplitudo_kuadratur.
• Quadrature_amplitude_modulation sameAs Quadrature_amplitude_modulation.
• Quadrature_amplitude_modulation sameAs 直角位相振幅変調.
• Quadrature_amplitude_modulation sameAs 직교_진폭_변조.
• Quadrature_amplitude_modulation sameAs Kwadratuur-amplitudemodulatie.
• Quadrature_amplitude_modulation sameAs Modulacja_QAM.
• Quadrature_amplitude_modulation sameAs Modulação_de_amplitude_em_quadratura.
• Quadrature_amplitude_modulation sameAs m.06bcg.
• Quadrature_amplitude_modulation sameAs Q749753.
• Quadrature_amplitude_modulation sameAs Q749753.
• Quadrature_amplitude_modulation sameAs Quadrature_amplitude_modulation.
• Quadrature_amplitude_modulation wasDerivedFrom Quadrature_amplitude_modulation?oldid=604420985.
• Quadrature_amplitude_modulation depiction PAL_colour_bar_signal_measured_vector_edit.png.
• Quadrature_amplitude_modulation isPrimaryTopicOf Quadrature_amplitude_modulation.