Anritsu S412E User Manual page 136

D-2 Glossary of Terms
AM : Amplitude Modulation (AM) uses amplitude variation in proportion to
AMC : Adaptive Modulation and Coding (AMC) is an alternative link
Analog System : An Analog system uses an analog transmission method to send voice,
Analog
Transmission : Analog Transmission refers to signals propagated through the medium
Antenna : Antenna is a device which radiates and/or receives radio signals,
Antenna
beamwidth : Antenna beamwidth, also known as the half-power beamwidth, is the
Antenna Directivity : Antenna directivity, also known as antenna gain, is the relative gain of
Antenna Efficiency : Antenna Efficiency is the percentage of theoretical gain actually
D-2
the amplitude of the modulating signal, and is usually taken as DSB-LC
(Double-Sideband Large Carrier) for commercial broadcast
transmissions and DSB-SC (Double-Sideband Suppressed Carrier) for
multiplexed systems.
adaptation method in 3G mobile wireless communication. AMC
provides the flexibility to match the modulation-coding scheme to the
average channel conditions for each user. With AMC, the power of the
transmitted signal is held constant over a frame interval, and the
modulation and coding format is changed to match the current received
signal quality or channel conditions.
video and data-using analog signals, such as electricity or sound waves,
that are continuously variable rather than discreet units as in digital
transmissions. Mobile analog systems include AMPS, NMT and
ETACS.
as continuously varying electromagnetic waves.
including RF, microwave, and RADAR.
angle of an antenna pattern or beam over which the relative power is at
or above 50% of the peak power.
the main beam of an antenna pattern to a reference antenna, usually an
isotropic or standard dipole. Antenna Directivity is the percentage of
radiated signal transmitted or received in a given direction related to
beamwidth.
realized from an antenna.
PN: 10580-00318 Rev. P
Glossary of Terms
S412E UG