To Demodulate A W-Cdma Signal - Agilent Technologies 89410A Operator's Manual

Using Wideband CDMA (Options B73, B79, and 080)

To demodulate a W-CDMA signal

This task shows you how to demodulate the W-CDMA signal that you
loaded in the previous task. If you are using your own W-CDMA signal
instead of the one from the previous task, you may need to change some
of the parameters set in step 5 to match those of your signal.
1.
Load the W-CDMA signal as instructed in the previous task.
2.
Turn on Wideband CDMA demodulation.
Press [ ], [
Instrument Mode
3.
Set the maximum W-CDMA span to 5 MHz.
Press [ ], [
System Utility
Press ],
[ mx WCDMA span
4.
Verify that the maximum number of time points is 4096:
Press [ ],
max time pts 4096 [enter].
If necessary, reallocate memory until you can set [
Smaller values limit the number of symbols that the analyzer can
demodulate and display.
5.
Set demodulation parameters for this signal:
Press [ ], [
Instrument Mode
Press [ ], [
demod format 3GPP forward link], [W-CDMA 5 MHz], [return], [return]
Selecting [
3GPP forward link
W-CDMA measurements, as proposed in the 3GPP 1999 forward link
standard. Pressing the [
sets the chip rate (3.84 MHz), main length (15 slots), scramble code (0),
and filter alpha (0.22) to match that of a 5 MHz, 3GPP 1999 forward-link
signal. For details about standard setups softkeys, see online help for the
[ ] softkey.
3GPP forward link
6.
If necessary, mirror the frequency spectrum.
Press [ ], [
Instrument Mode
As mentioned in the previous task, some W-CDMA signals may have a
flipped (mirrored) frequency spectrum. If this is true for your signal, you
must perform this step.
7.
Select the composite code-domain power display:
Press [
Measurement Data
8.
Start the measurement:
Press [ ].
Pause/Single
9.
After the measurement finishes, autoscale the results:
Press [ ].
Auto Scale
13 - 4
demod type], [Wideband CDMA].
], [
memory usage configure meas memory
z.
5 MH
].
demodulation setup
] configures the analyzer to make base-station,
] standard-setup softkey automatically
W-CDMA 5 MHz
],
[freq spectrum mirror]
demodulation setup
], [
code domain], [composite].
]
to 4096 points.
max time pts]
.