Matches in DBpedia 2016-04 for { <http://dbpedia.org/resource/Quadrature_amplitude_modulation> ?p ?o }
- 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 of the same frequency, 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 final 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 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.svg?width=300.
- Quadrature_amplitude_modulation wikiPageExternalLink QAM_defined.php.
- Quadrature_amplitude_modulation wikiPageExternalLink qam_constellation_diagram_from_snr.
- Quadrature_amplitude_modulation wikiPageExternalLink qam.
- Quadrature_amplitude_modulation wikiPageExternalLink index.cfm?act=app_notes¬es=iqv_phaseshift.
- Quadrature_amplitude_modulation wikiPageExternalLink FileDownload.aspx?A=3445.
- Quadrature_amplitude_modulation wikiPageExternalLink ModFormat_PolMuxQPSK.php.
- Quadrature_amplitude_modulation wikiPageID "25316".
- Quadrature_amplitude_modulation wikiPageLength "24223".
- Quadrature_amplitude_modulation wikiPageOutDegree "123".
- Quadrature_amplitude_modulation wikiPageRevisionID "708050994".
- Quadrature_amplitude_modulation wikiPageWikiLink AM_stereo.
- Quadrature_amplitude_modulation wikiPageWikiLink Additive_white_Gaussian_noise.
- Quadrature_amplitude_modulation wikiPageWikiLink Amplitude.
- Quadrature_amplitude_modulation wikiPageWikiLink Amplitude-shift_keying.
- Quadrature_amplitude_modulation wikiPageWikiLink Amplitude_and_phase-shift_keying.
- Quadrature_amplitude_modulation wikiPageWikiLink Amplitude_modulation.
- Quadrature_amplitude_modulation wikiPageWikiLink Asymmetric_digital_subscriber_line.
- Quadrature_amplitude_modulation wikiPageWikiLink Binary_number.
- Quadrature_amplitude_modulation wikiPageWikiLink Bit.
- Quadrature_amplitude_modulation wikiPageWikiLink Bit_error_rate.
- Quadrature_amplitude_modulation wikiPageWikiLink Bitstream.
- Quadrature_amplitude_modulation wikiPageWikiLink Broadcasting.
- Quadrature_amplitude_modulation wikiPageWikiLink C-QUAM.
- Quadrature_amplitude_modulation wikiPageWikiLink Cable_modem.
- Quadrature_amplitude_modulation wikiPageWikiLink Carrier-to-noise_ratio.
- Quadrature_amplitude_modulation wikiPageWikiLink Carrier_wave.
- Quadrature_amplitude_modulation wikiPageWikiLink Carrierless_amplitude_phase_modulation.
- Quadrature_amplitude_modulation wikiPageWikiLink Category:Data_transmission.
- Quadrature_amplitude_modulation wikiPageWikiLink Category:Radio_modulation_modes.
- Quadrature_amplitude_modulation wikiPageWikiLink Center_frequency.
- Quadrature_amplitude_modulation wikiPageWikiLink Color_television.
- Quadrature_amplitude_modulation wikiPageWikiLink Colorburst.
- Quadrature_amplitude_modulation wikiPageWikiLink Constellation_diagram.
- Quadrature_amplitude_modulation wikiPageWikiLink Coordinate_system.
- Quadrature_amplitude_modulation wikiPageWikiLink Crosstalk.
- Quadrature_amplitude_modulation wikiPageWikiLink Data.
- Quadrature_amplitude_modulation wikiPageWikiLink Decibel.
- Quadrature_amplitude_modulation wikiPageWikiLink Demodulation.
- Quadrature_amplitude_modulation wikiPageWikiLink Digital_cable.
- Quadrature_amplitude_modulation wikiPageWikiLink Digital_terrestrial_television.
- Quadrature_amplitude_modulation wikiPageWikiLink Double-sideband_suppressed-carrier_transmission.
- Quadrature_amplitude_modulation wikiPageWikiLink Error_function.
- Quadrature_amplitude_modulation wikiPageWikiLink Ethernet_over_coax.
- Quadrature_amplitude_modulation wikiPageWikiLink Euclidean_distance.
- Quadrature_amplitude_modulation wikiPageWikiLink Fourier_transform.
- Quadrature_amplitude_modulation wikiPageWikiLink Freeview_(UK).
- Quadrature_amplitude_modulation wikiPageWikiLink Frequency-shift_keying.
- Quadrature_amplitude_modulation wikiPageWikiLink Frequency_domain.
- Quadrature_amplitude_modulation wikiPageWikiLink Frequency_modulation.
- Quadrature_amplitude_modulation wikiPageWikiLink G.hn.
- Quadrature_amplitude_modulation wikiPageWikiLink Gray_code.
- Quadrature_amplitude_modulation wikiPageWikiLink Herley_Industries.
- Quadrature_amplitude_modulation wikiPageWikiLink Hertz.
- Quadrature_amplitude_modulation wikiPageWikiLink Hierarchical_modulation.
- Quadrature_amplitude_modulation wikiPageWikiLink ITU-T.
- Quadrature_amplitude_modulation wikiPageWikiLink In-phase_and_quadrature_components.
- Quadrature_amplitude_modulation wikiPageWikiLink Infinity.
- Quadrature_amplitude_modulation wikiPageWikiLink Interferometry.
- Quadrature_amplitude_modulation wikiPageWikiLink List_of_trigonometric_identities.
- Quadrature_amplitude_modulation wikiPageWikiLink Low-pass_filter.
- Quadrature_amplitude_modulation wikiPageWikiLink Microwave.
- Quadrature_amplitude_modulation wikiPageWikiLink Modulation.
- Quadrature_amplitude_modulation wikiPageWikiLink Multipath_interference.
- Quadrature_amplitude_modulation wikiPageWikiLink NTSC.
- Quadrature_amplitude_modulation wikiPageWikiLink Noise.
- Quadrature_amplitude_modulation wikiPageWikiLink Noise_(electronics).
- Quadrature_amplitude_modulation wikiPageWikiLink Orthogonality.
- Quadrature_amplitude_modulation wikiPageWikiLink PAL.
- Quadrature_amplitude_modulation wikiPageWikiLink Phase-locked_loop.
- Quadrature_amplitude_modulation wikiPageWikiLink Phase-shift_keying.
- Quadrature_amplitude_modulation wikiPageWikiLink Phase_(waves).
- Quadrature_amplitude_modulation wikiPageWikiLink Phase_modulation.
- Quadrature_amplitude_modulation wikiPageWikiLink Pilot_signal.
- Quadrature_amplitude_modulation wikiPageWikiLink Power-line_communication.
- Quadrature_amplitude_modulation wikiPageWikiLink Probability.
- Quadrature_amplitude_modulation wikiPageWikiLink Probability_density_function.
- Quadrature_amplitude_modulation wikiPageWikiLink Product_detector.
- Quadrature_amplitude_modulation wikiPageWikiLink Pulse-amplitude_modulation.
- Quadrature_amplitude_modulation wikiPageWikiLink QAM_(television).
- Quadrature_amplitude_modulation wikiPageWikiLink Radio_frequency.
- Quadrature_amplitude_modulation wikiPageWikiLink Random_modulation.
- Quadrature_amplitude_modulation wikiPageWikiLink Signal-to-noise_ratio.
- Quadrature_amplitude_modulation wikiPageWikiLink Sine.
- Quadrature_amplitude_modulation wikiPageWikiLink Sine_wave.
- Quadrature_amplitude_modulation wikiPageWikiLink Single-sideband_modulation.
- Quadrature_amplitude_modulation wikiPageWikiLink Society_of_Cable_Telecommunications_Engineers.
- Quadrature_amplitude_modulation wikiPageWikiLink Spectral_density.
- Quadrature_amplitude_modulation wikiPageWikiLink Spectral_efficiency.
- Quadrature_amplitude_modulation wikiPageWikiLink Subcarrier.
- Quadrature_amplitude_modulation wikiPageWikiLink Symbol_rate.
- Quadrature_amplitude_modulation wikiPageWikiLink Telecommunication.
- Quadrature_amplitude_modulation wikiPageWikiLink Telephone_line.
- Quadrature_amplitude_modulation wikiPageWikiLink Trigonometric_functions.
- Quadrature_amplitude_modulation wikiPageWikiLink Watt.
- Quadrature_amplitude_modulation wikiPageWikiLink Category:Cable_television_terminology.
- Quadrature_amplitude_modulation wikiPageWikiLink File:16QAM_Gray_Coded.svg.
- Quadrature_amplitude_modulation wikiPageWikiLink File:ADSL_spectrum_Fritz_Box_Fon_WLAN.png.
- Quadrature_amplitude_modulation wikiPageWikiLink File:Circular_16QAM.svg.