Agilent Technologies ESG Betriebsanweisung Seite 384

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368 Chapter 15
W-CDMA Uplink Digital Modulation for Receiver Test
Generating a Single PRACH Signal
slot format. The Puncture field currently displays a negative value. This indicates that
bits will be added to the data in order to facilitate rate matching. A positive value in this
field means that puncturing will occur according to the percentage shown. Figure 15-15
shows the location of the Max Puncture and Puncture fields.
a. Move the cursor to highlight the Blk Size field.
b. Press
450 > Enter > Apply Channel Setup.
The puncture rate has changed, because an increase in the block size increases the RACH
data rate. Figure 15-15 shows what the ESG display looks like once the transport channel
parameters have been set.
Figure 15-15 Display after Transport Layer Setup
Changing the PRACH Output Trigger
Press
Return > Return > PRACH Rear Panel Setup > PRACH Output Signal Setup >
More (1 of 3) > More (2 of 3) > Message Pulse (RPS22) > Mode Setup.
This changes the triggering for the PSA so that the sweep starts at the beginning of the
PRACH message part.
You have now modified the PRACH physical and transport channel parameters. The PRACH
will now transmit four preambles with power stepping and the spacing/timing between each
preamble (beginning of one preamble to the beginning of the next preamble) was adjusted for
two access slots. The message part transmission has also been set to 10 ms. The RACH data
rate was increased when the block size was adjusted. This resulted in the rate matching
algorithm puncturing the data in order to fit it into a frame for the given slot format.
Max Puncture
Puncture
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