ESG-D Series Option H98 Signal Generators
Glossary-2 Manual Supplement
ACCH Associated Control Channel.
Access Channel A reverse channel that a mobile station uses to communicate with a
base station for short signaling message exchanges (such as call originations, responses to
pages, and registrations).
ACPR Adjacent Channel Power Ratio.
Base Station A fixed station used for communicating with mobile stations.
bps Bits per second.
Chip Informal term used to refer to either a binary element of a spreading sequence, or
the time interval that it occupies, or 1/1.4.096 MHz = 244.1 ns, or, at the speed of light, a
distance of c/f = (0.3 m/ns)/1.2288 MHz = 244.1 meters.
Code Division Multiple Access (CDMA) A technique for spread-spectrum multiple
access digital communication that creates channels through the use of noise-like carriers.
Convolutional Code An error-correcting code that is generated by finite-field division of
the data sequence, regarded as a polynomial over a finite field, by a generator polynomial.
Such a division resembles a discrete convolution.
CRC See “Cyclic Redundancy Code (CRC)”
Cyclic Redundancy Code (CRC) A class of linear error-detecting codes that generate
parity check bits as the remainder of a polynomial division of the data, regarded as a
polynomial, by a generator polynomial.
Data Insert The point of data insertion for WCDMA coding.
Data Pattern The type of data encoded on a WCDMA channel.
DTCH Dedicated Traffic Channel. A point-to-point, bidirectional channel that transmits
user information.
DTX Discontinuous Transmission.
Encoder Tail Bits Fixed value bits appended to a block of data in order to flush a
convolutional encoder so that it is left in a known state. Leaving the encoder in a known
state aids the decoding.
EVM Error Vector Magnitude.
FACH Forward Access Channel. A forward link transport channel used to transmit
control information from a base station to a mobile station when the system knows the
location cell of the mobile station. May also carry short user packets.
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