quadrature modulation


Also found in: Acronyms.

quadrature modulation

[′kwä·drə·chər ‚mäj·ə′lā·shən]
(communications)
Modulation of two carrier components 90° apart in phase by separate modulating functions.
References in periodicals archive ?
Direct quadrature modulation, as shown in Figure 4, is a common form of direct conversion used in the transmit path.
The previously shown example of a generic direct quadrature modulation transmit architecture can be used for any type of modulation.
The model RF9958 IC offers quadrature modulation, transmit AGC amplification and upconversion in a single QSOP-28 plastic package, The models RF9957 and RF2667 ICs feature receive AGC amplification and quadrature demodulation in a single QSOP-24 plastic package.
This contributes to superior signal-to-noise ratio when transmitting a digitally encoded signal using quadrature modulation techniques such as IBOC DAB.
5 utilizes the existing I/Q modem from the PRISM II chip set, the HFA3783, which features all the necessary blocks for quadrature modulations and demodulation of "I" and "Q" baseband signals.

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