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phase modulation
A method of sending information by modifying (modulating) the difference in phase (fraction of a wave length) between a signal and a reference.
R-module
(algebra) The monoid action of a ring R on an abelian group.
R-modules
Subscriber Identity Module
A component on a SIM card that stores information to identify a mobile phone user.
single-sideband modulation
(radio) A modification of amplitude modulation that modulates the output signal on a single sideband only, as opposed to both sidebands.
Subscriber Identity Modules
quadrature amplitude modulation
(radio) A modulation scheme that conveys data by applying amplitude modulation to two carrier waves at once. These two waves, usually sinusoids, are out of phase with each other by 90° and are thus called quadrature carriers. Commonly abbreviated QAM.
command and service module
The "mother ship" of the spacecraft that carried astronauts to the Moon in the Apollo missions.