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Chapter 15 389
W-CDMA Uplink Digital Modulation for Receiver Test
Setting Up a Multiple PRACH Signal
Figure 15-30 PRACH Power Setup Display
Setting the Preamble Power
1. Highlight the Max Pwr field.
2. Press
-30 > dBm.
Notice that the carrier power has changed. The carrier power will always be 18.06 dB above
the PRACH power. See “Understanding the Power Offset Between the Carrier and the
Multiple PRACH” on page 378 for more information on the power offset.
Adjusting the Control Part Power
1. Highlight the Pp-m field.
2. Press
5 > dB.
The control part power is set with respect to the preamble power level. The Pp-m value is used
to adjust the control part power level. Do not confuse this as setting the message part power
5 dB above the preamble. It is the combination of the control part and the data part power
that determine the message part power. However, since the control part is now 5 dB higher
than the preamble, the message part power cannot drop below the level of
25 dBm (preamble
power of
30 dBm + 5 dB Pp-m)
Configuring the Data Part Power
1. Set the control power level to zero dB.
Controls the Data Part Power
Controls the Control Part Power
Controls the Preamble Power
Pp-m Power Mode Selected
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