List of terms xiii
FDMA
Frequency Division Multiple Access. A frequency assignment arrangement whereby all users share the total frequency allotment and each frequency is assigned to a given user at access on a multiple user access basis.
Filter
A frequency selective device which is tuned to pass some frequencies and attenuate others. Common filter types include
FM
Frequency Modulation. A modulation technique that causes the frequency of the carrier to vary above and below its resting frequency; the rate of which is determined by the frequency of the modulating signal and the deviation of which is determined by the magnitude of the modulating signal.
Forward path
The path from cell site to cellular subscriber.
HSMO
High Stability Master Oscillator. A unit that provides a highly stable 4.8 MHz reference for synchronizing the Transmit Receive Unit (TRU).
ICP
Intelligent Cellular Peripheral. A switch site peripheral that provides an interface between the cell site and the switch. The ICP also oversees the operations of the cell site.
ICRM
Integrated Cellular Remote Module. A cell site peripheral that serves as an interface between the Intelligent Cellular Peripheral (ICP) and the radio transmission subsystems. The ICRM is designed to support both analog and digital Radio Frequency (RF) equipment.
IM
Intermodulation. A type of interaction between signals in a nonlinear medium which produces phantom signals at sum and difference frequencies. These phantom signals may interfere with reception of legitimate signals occupying the frequencies upon which they happen to fall.
Isolation
The attenuation (expressed in dB) between any two signal or radiation points.
LCR
Locating Channel Receiver. A radio receiver which is frequency agile and is used to measure and report the received signal strength, in dBm, of a channel.
Loss
A magnitude of attenuation, expressed in dB, for a given path between any two points.