S331L UG PN: 10580-00321 Rev. M B-11
Glossary of Terms B-2 Glossary Terms
NF : Noise Figure (NF) is a measure of degradation of
the signal-to-noise ratio (SNR) that is caused by
components in a radio frequency (RF) device. The
noise factor (F) of a system is defined as the
signal-to-noise ratio of the input power of the
system divided by the signal-to-noise ratio of the
output power of that system. NF (the noise figure)
is defined as the decibel value of the noise factor.
NF = 10log (F) where log uses the base 10, or
common log. This formula is valid only when the
input termination is at standard noise
temperature.
OBW : Occupied Bandwidth (OBW) is a measure of the
bandwidth containing 99% of the total integrated
power of the transmitted spectrum, centered on
the assigned channel frequency. Interference to
other channels or to other systems can occur if
OBW is too large.
OTA : Over-The-Air (OTA) refers generally to any
transfer of information or signal that takes place
in a wireless environment, rather than using a
wired connection. OTA is usually used in
connection with a standard defining the
provisioning of mobile devices and applications,
such as downloading or uploading content or
software, and commonly used in conjunction with
the Short Messaging Service (SMS). SMS OTA
Messages contain information that is used to
configure the settings of a WAP browser in a
mobile phone (refer to SMS and WAP).
RBW : Resolution Bandwidth (RBW) With spectrum
analyzers, a narrow band filter is swept across a
frequency span to create the spectrum display.
The filter bandwidth (RBW) determines the
frequency resolution across the frequency axis.
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