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Glossary
78
Code Domain Analyzer An instrument
that measures individual Walsh Channel
characteristics in a CDMA channel. The
Cellular Adapter can display all 64 Walsh
Channels in a received signal and display
their power, phase, and timing relationship.
Code Domain Phase A measurement
mode that provides the relative phase
relationship between various Walsh
Channels and the Pilot Channel.
Code Domain Power A measurement
mode that presents the signal strength of the
Walsh Channels in a CDMA signal. It
indicates the division of the total power in
the channel as shared by the Pilot, Sync,
Paging, and Traffic channels.
Code Domain Timing A measurement
mode that indicates the relative timing
relationship between various Walsh
Channels and the Pilot Channel.
Data Block The sampled and quantized
record of a portion of the IF waveform at the
input to the DSP analyzer. The data block’s
length is determined by the Interval
field on the CDMA ANALYZER screen.
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
terms of its ratio (in dB) to one Watt.
Downconverter An RF network using a
local oscillator to translate an input signal to
a lower (intermediate) frequency.
Downlink See Forward Link.
E
b
The energy in an information bit.
E
b
/N
0
The ratio between the energy of
each information bit (E
b
) and the noise
spectral density (N
o
). This ratio is usually
expressed in dB.
Even-Second Clock A clock that occurs
every two seconds.
FER See Frame Error Rate.
FIR Filter Finite Impulse Response filter.
A filter for which the output, in response to
an impulse input, totally dies away after a
finite time interval. The term is usually used
in reference to a digital filter.
Forward CDMA Channel A CDMA
channel from a base station to mobile
stations. The forward CDMA channel
contains one or more code channels that are
transmitted on a CDMA frequency
assignment using a particular pilot PN
offset. The code channels are associated
with the pilot channel, sync channel, paging
channels, and traffic channels. The forward
CDMA channel always carries a pilot
channel and may carry up to 1 sync channel,
up to 7 paging channels, and up to 63 traffic
channels, as long as the total number of
channels, including the pilot channel, is no
greater than 64.
Forward Link The link direction from the
base station to the mobile station. Also
referred to as the downlink.
Forward Traffic Channel A code
channel used to transport primary traffic,
secondary traffic, and signaling traffic from
the base station to the mobile station.