Carrierless amplitude phase modulation (original) (raw)
Carrierless amplitude phase modulation (CAP) is a variant of quadrature amplitude modulation (QAM). Instead of modulating the amplitude of two carrier waves, CAP generates a QAM signal by combining two PAM signals filtered through two filters designed so that their impulse responses form a Hilbert pair. If the impulse responses of the two filters are chosen as sine and a cosine, the only mathematical difference between QAM and CAP waveforms is that the phase of the carrier is reset at the beginning of each symbol. If the carrier frequency and symbol rates are similar, the main advantage of CAP over QAM is simpler implementation. The modulation of the baseband signal with the quadrature carriers is not necessary with CAP, because it is part of the transmit pulse.
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| dbo:abstract | Carrierless amplitude phase modulation (CAP) is a variant of quadrature amplitude modulation (QAM). Instead of modulating the amplitude of two carrier waves, CAP generates a QAM signal by combining two PAM signals filtered through two filters designed so that their impulse responses form a Hilbert pair. If the impulse responses of the two filters are chosen as sine and a cosine, the only mathematical difference between QAM and CAP waveforms is that the phase of the carrier is reset at the beginning of each symbol. If the carrier frequency and symbol rates are similar, the main advantage of CAP over QAM is simpler implementation. The modulation of the baseband signal with the quadrature carriers is not necessary with CAP, because it is part of the transmit pulse. (en) Carrierless Amplitude/Phase Modulation (CAP) ist ein Leitungscode und nicht standardisierte Variation der Quadraturamplitudenmodulation (QAM) für die Übertragung im Basisband von digitalen Signalen auf leitungsgebundenen Übertragungsstrecken wie beispielsweise Teilnehmeranschlussleitungen. (de) Modulacja CAP (ang. Carrierless Amplitude Phase modulation) – amplitudowo-fazowa modulacja bez fali nośnej. Jest modyfikacją modulacji QAM. Stosowana w pierwszych systemach DSL, z czasem została wyparta przez . Implementacje CAP umożliwiają zmianę zarówno głębokości modulacji jak i prędkości transmisji w celu dostosowania się do warunków na linii. (pl) |
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| rdfs:comment | Carrierless amplitude phase modulation (CAP) is a variant of quadrature amplitude modulation (QAM). Instead of modulating the amplitude of two carrier waves, CAP generates a QAM signal by combining two PAM signals filtered through two filters designed so that their impulse responses form a Hilbert pair. If the impulse responses of the two filters are chosen as sine and a cosine, the only mathematical difference between QAM and CAP waveforms is that the phase of the carrier is reset at the beginning of each symbol. If the carrier frequency and symbol rates are similar, the main advantage of CAP over QAM is simpler implementation. The modulation of the baseband signal with the quadrature carriers is not necessary with CAP, because it is part of the transmit pulse. (en) Carrierless Amplitude/Phase Modulation (CAP) ist ein Leitungscode und nicht standardisierte Variation der Quadraturamplitudenmodulation (QAM) für die Übertragung im Basisband von digitalen Signalen auf leitungsgebundenen Übertragungsstrecken wie beispielsweise Teilnehmeranschlussleitungen. (de) Modulacja CAP (ang. Carrierless Amplitude Phase modulation) – amplitudowo-fazowa modulacja bez fali nośnej. Jest modyfikacją modulacji QAM. Stosowana w pierwszych systemach DSL, z czasem została wyparta przez . Implementacje CAP umożliwiają zmianę zarówno głębokości modulacji jak i prędkości transmisji w celu dostosowania się do warunków na linii. (pl) |
| rdfs:label | Carrier-less Amplitude/Phase Modulation (de) Carrierless amplitude phase modulation (en) CAP (telekomunikacja) (pl) |
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