Troubleshooting W-Cdma Measurements - Agilent Technologies 89410A Operator's Manual

Troubleshooting W-CDMA Measurements

This section lists common problems that you may encounter when making
W-CDMA measurements, plus the cause of and fix for each problem.
Problem/Cause
Unable to demodulate W-CDMA Signal
ü For [
], Perch 1 signal
trial 1998 forward link
not present or signal level too low.
ü For [
], Perch signal with
ARIB rev 1.0-1.2
first search code not present or signal level
too low.
ü For [
], PSCH or
3GPP 1999 forward link
CPICH are missing or too low.
ü W-CDMA signal is frequency inverted.
ü Frequency span is too narrow.
ü Analyzer's center frequency is too far from
the signal center frequency.
ü Too many active channels.
ü Incorrect scramble code specified.
ü Several base stations are transmitting and
the analyzer is using the Perch channel
from the wrong base station (the analyzer
selects the base station with the highest
Perch signal level).
ü Code group selected and wrong group
number specified.
Wideband CDMA Concepts (Options B73, B79, and 080)
Solution
Verify that signal includes Perch 1 and that the Perch
signal level is adequate.
Verify that signal includes Perch with the first search
code and that the signal level of each is adequate.
Verify that signal includes PSCH and CPICH and that
the signal level of each is adequate.
Press [ ], [
Instrument Mode demodulation setup
select [ ].
freq spectrum mirror
See Frequency Span earlier in this chapter.
See Center Frequency earlier in this chapter.
Reduce the number of active channels in your
W-CDMA signal.
Press [ ], [
Instrument Mode demodulation setup
[ ] and set the scramble code to that used
scramble code
by your signal.
Increase the Perch signal level for the station that you
want to lock to.
Press [ ], [
Instrument Mode demodulation setup
[ ] and enter the correct group number.
scramble code
] and
],
],
24 - 17