
394 Chapter 15
W-CDMA Uplink Digital Modulation for Receiver Test
Setting Up a Multiple PRACH Signal
access slot.
In order to clearly show the second UE1 PRACH transmission on the PSA, we will
select an access slot that will not be occupied by other UEs that are configured later in
this task.
c. Press
15 > Enter.
2. Configure UE2 for a single PRACH transmission starting in access slot 2.
a. Highlight the first access slot position for UE2.
b. Press
2 > Enter.
This PRACH will start its transmission between the first preamble for UE1 and its
message part. The message part for UE2 will begin during the first message part for UE1.
For the length of time that the message part for UE1 and UE2 occupy the same access
slots, they will be additive creating a stronger signal during that time period.
3. Leave UE4 to transmit a single PRACH starting in access slot 0.
This PRACH will occupy the same access slots as the first PRACH transmission for UE1.
UE1 and UE4 will be additive during this transmission time period creating a higher
signal level for the same period of time.
4. Press
Apply Channel Setup.
When the Apply Needed annunciator appears, press the
Apply Channel Setup softkey. You
will not see a change in the signal until you press this softkey.
Figure 15-32 shows both the completed timing setup display and a graphical representation of
the setup by access slot when this procedure was used to configure the multiple PRACH
signal. Figure 15-33 on page 397 shows the output of the ESG, with the same configuration,
on the Agilent E4440A PSA Spectrum Analyzer.
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