Agilent Technologies ESG Betriebsanweisung Seite 406

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Seitenansicht 405
390 Chapter 15
W-CDMA Uplink Digital Modulation for Receiver Test
Setting Up a Multiple PRACH Signal
a. Highlight the Ctrl Beta field.
b. Press
15 > Enter.
You are now using the control part power as the 0 dB reference for the data part power.
This means that the 25 dBm control part power set in the Adjusting the Control Part
Power task, is now the zero dB reference for the data part power that will be set in step 2.
Changes to the Ctrl Pwr or the Ctrl Beta fields does not affect the control part power
level; it only sets a reference level for the data part power.
2. Set the data part power relative to the control part power.
a. Highlight the Data Beta field.
b. Press
5 > Enter.
You have now set the data part power to be 9.54 dB lower than the control part power. A
beta of 5 equates to 9.54 dB. Since the data part power is less than the control part power,
you will notice that the message part power is approximately 5 dB higher than the
preamble power level. This indicates that the message part power is dominated by the
control part. If you set both data the part and control part relative powers to 0.0 dB (equal
data part and control part power levels or double the control part power), you will see a
3 dB increase in the message part.
Figure 15-31 shows the PRACH power setup display after all tasks within this procedure have
been completed.
Figure 15-31 PRACH Power Settings
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