User's Manual

GLOSSARY
2003 IPMobileNet, Inc. 40 IPSeries MR User Manual / Rev. A / 04-September-03
GFSK Gaussian Filtered Frequency Shift Keying – A form of digital
modulation in which the baseband modulation signal is
filtered by a low-pass filter with a Guassian response prior to
modulating the carrier signal.
GPS Global Positioning System
Image Frequency An unwanted frequency, which will produce an on-frequency
IF (Intermediate Frequency) signal.
Injection An injection signal is a signal used in frequency conversion
circuits, it is normally mixed with another signal to produce a
third signal (which is a sum or difference or the original
signal and the injection signal).
Half Duplex A dual frequency mode of operation, which inhibits
simultaneous transmission and reception.
LO Local Oscillator – An on-board oscillator used in frequency
conversion circuits.
Modular Design A design in which the major functional components are
separated into distinct modules.
Multipath A radio propagation situation in which multiple RF (radio
frequency) signal paths exists between a transmitter and
receiver. These multiple paths or multi-path situations can
create significant distortion in the received signal.
NFEZ Near-Field Exclusion Zone
Noise Figure The “Figure of Merit” of an amplifier. Specifically, noise
figure is a measure of the degradation in SNR (signal-to-
noise ratio) between the input and output ports of a network.
PCB Printed Circuit Board
Phase Linearity Implies a linear relationship between the phase of a signal
and the frequency of that signal. A linear phase response
ensures constant input to output delays regardless of
frequency, import for wireless communication systems.
Phase Noise A measure of the purity of a discrete frequency (expressed
in –dBc/Hz at some offset frequency).