User`s guide

Chapter 15 371
W-CDMA Uplink Digital Modulation for Receiver Test
Generating a Single PRACH Signal
Figure 15-17 AICH Connection Diagram
Configuring the PRACH Message for the AICH Trigger
1. Press
Mode Setup > Link Control > PhyCH Setup > PRACH Timing Setup.
2. Select AICH as the entry for the Message Part field.
a. Highlight the Message Part field.
b. Press
Edit Item > AICH.
This sets up the PRACH signal so that the message part is not transmitted until an
AICH trigger is received. Since the ESG is not a receiver, it cannot receive and
demodulate a true AICH signal, so the input has to be a trigger signal.
3. Set the number of preambles to 1.
a. Highlight the Number of Preamble field.
b. Press
1 > Enter.
You can set the number of preambles in either the PRACH Power or PRACH Timing Setup
display.
Setting Up the LF Output as the AICH Signal
This task sets up the LF output so the results of the AICH trigger signal can be viewed on the
PSA display (see “Viewing the PRACH Message Using an AICH Trigger”). By following the
steps in this task, the message part will appear intermittently after each displayed preamble
as the AICH trigger is received.
1. Press
LF Out > LF Out Source > Function Generator.