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・ Ampliphase
・ AmpliPHOX
・ Amplirhagada
・ Amplirhagada astuta
・ Amplirhagada elevata
・ Amplirhagada herbertena
・ Amplirhagada montalivetensis
・ Amplirhagada questroana
・ Amplitempora captiocula
・ AmpliTube
・ Amplitude
・ Amplitude (political party)
・ Amplitude (video game)
・ Amplitude adjusting
・ Amplitude amplification
Amplitude and phase-shift keying
・ Amplitude damping channel
・ Amplitude death
・ Amplitude distortion
・ Amplitude domain reflectometry
・ Amplitude gate
・ Amplitude modulation
・ Amplitude modulation signalling system
・ Amplitude of accommodation
・ Amplitude of low frequency fluctuations
・ Amplitude panning
・ Amplitude Studios
・ Amplitude versus offset
・ Amplitude-companded single-sideband modulation
・ Amplitude-Comparison Monopulse


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Amplitude and phase-shift keying : ウィキペディア英語版
Amplitude and phase-shift keying


Amplitude and phase-shift keying or asymmetric phase-shift keying (APSK), is a digital modulation scheme that conveys data by changing, or modulating, both the amplitude and the phase of a reference signal (the carrier wave). In other words, it combines both Amplitude-shift keying (ASK) and Phase-shift keying (PSK) to increase the symbol-set. It can be considered as a superclass of Quadrature amplitude modulation (QAM). The advantage over conventional QAM, for example 16-QAM, is lower number of possible amplitude levels.
Moreover, a careful design of the constellation geometry enables to approach the Gaussian capacity when the constellation size grows to infinity. For the regular QAM constellations, a gap of 1.56 dB is observed. The previous solution, where the constellation has a Gaussian shape, is called constellation shaping.
==References==

* (DVB-Flexible Serially Concatenated Convolutional Turbo Codes with Near-Shannon bound performance for telemetry applications ), CCSDS-131.2-O-1.
*H. Méric, (Approaching the Gaussian channel capacity with APSK constellations ), ''IEEE Communications Letters''.

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