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quadrature amplitude modulation |
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quadrature amplitude modulationSee QAM. quadrature amplitude modulation [¦kwäd·rə·chər ‚am·plə‚tüd ‚mäj·ə′lā·shən] (communications) Abbreviated QAM. Quadrature modulation in which the two carrier components are amplitude-modulated. A digital modulation technique in which digital information is encoded in bit sequences of specified length and these bit sequences are represented by discrete amplitude levels of an analog carrier, by a phase shift of the analog carrier from the phase that represented the previous bit sequence by a multiple of 90°, or by both.
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WiMAX systems use a 64 quadrature amplitude modulation (QAM) orthogonal frequency-division multiplexing (OFDM) signal. Quadrature Amplitude Modulation (QAM): This method is used for varying the amplitude of cable broadcast signals. a leading provider of next generation Ethernet in the First Mile (EFM) broadband access solutions, today announced the ExpressSTREAM Very high speed Digital Subscriber Loop (VDSL) XH-1200 Quadrature Amplitude Modulation (QAM) based concentrator supporting ExpressSTREAM hospitality, multi-tenant and LEC pop sites. |
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