LG VX5400, Service Manual

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CDMA Channel Number. An 11-bit number corresponding to the center of the CDMA frequency assignment.
CDMA Frequency Assignment. A 1.23MHz segment of spectrum centered on one of the 30KHz channels of the
existing analog system.
Code Channel . A subchannel of a Forward CDMA Channels. A Forward CDMA Channel contains 64 code channels.
Code channel zero is assigned to the Pilot Channel. Code channels 1 through 7 may be assigned to the either Paging
Channels or the Traffic Channels. Code Channel 32 may be assigned to either a Sync Channel or a Traffic Channel.
The remaining code channels may be assigned to Traffic Channels.
Code Division Multiple Access (CDMA). A technique for spread-spectrum multiple-access digital communications
that creates channels through the use of unique code sequences.
Code Symbol . The output of an error-correcting encoder. Information bits are input to the encoder and code symbols
are output from the encoder. See Convolutional Code.
Continuous Transmission . A mode of operation in which Discontinuous Transmission is not permitted.
Control Mobile Attenuation Code (CMAC). A 3-bit field in the Control-Filler Message that specifies the
maximum authorized power level for a mobile transmitting on an analog reverse control channels.
Convolution Code . A type of error-correcting code. A code symbol can be considered as the convolution of the
input data sequence with the impulse response of a generator function.
CRC. See Cyclic Redundancy Code.
Cyclic Redundancy Code (CRC). A class of linear error detecting codes which generate parity check bits by
finding the remainder of a polynomial division.
Data Burst Randomizer. The function that determines which power control groups within a frame are transmitted
on the Reverse Traffic Channel when the data rate is lower than 9600 bps. The data burst randomizer determines, for
each mobile station, the pseudo random position of the transmitted power control groups in the frame while
guaranteeing that every modulation symbol is transmitted exactly once.
DBc. The ratio (in dB) of the sideband power of a signal, measured in a given bandwidth at a given frequency offset
from the center frequency of the same signal, to the total inband power of the signal. For CDMA, the total inband
power of the signal is measured in a 1.23MHz bandwidth around the center frequency of the CDMA signal.
DBm . A measure of power expressed in terms of its ration (in dB) to one milliwatt.
DBm/Hz . A measure of power spectral density. DBm/Hz is the power in one Hertz of bandwidth. Where power is
expressed in units of dBm.
DBW . A measure of power expressed in terns of its ration (in dB) to one Watt.
Dedicated Control Channel. An analog control channel used for the transmission of digital control information from
either a base station or a mobile station.
Deinterleaving. The process of unpermuting the symbols that were permuted by the interleaver..
Deinterleaving is performed on received symbols prior to decoding.
Digital Color Code (DCC). A digital signal transmitted by a base station on a forward analog control channel that is
used to detect capture of a base station by an interfering mobile station.
Dim-and-Burst . A frame in which primary traffic is multiplexed with either secondary traffic or signaling traffic.
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