Chapter 16 479
W-CDMA Uplink Digital Modulation for Receiver Test
Setting Up a Multiple PRACH Signal
Setting Up a Multiple PRACH Signal
The ESG automatically turns off the ALC (automatic leveling control) when the multiple PRACH mode is
selected. This is due to the bursting characteristics of the PRACH signal that causes rapidly varying power
levels. This situation is compounded in the multiple PRACH mode where you have multiple PRACH bursts
occurring, so the ESG ALC cannot maintain a constant power level. A manual power search can be
performed by pressing the
Apply Channel Setup softkey. Refer to “Special Power Control Considerations
When Using DPCCH/DPDCH in Compressed Mode or PRACH” on page 570 for more information.
The procedure, “Selecting the PRACH and Multiple PRACH Modes” on page 480, shows you how to
access the W-CDMA modulation format. However most of the other procedures start from the first-level
W-CDMA softkey menu, which is shown in Figure 16-24. In this way, each procedure can stand alone
without regard to steps performed in other sections.
Figure 16-24 First-Level W-CDMA Softkey Menu
By following the procedures in this section, you will learn how to setup a basic multiple PRACH signal. The
section, “Viewing a Multiple PRACH Signal” on page 495, shows the output of the ESG using the
parameters set in each of the following procedures.
Configuring the RF Output
1. Preset the ESG.
2. Set the carrier frequency to 1.95 GHz.
3. Set the carrier power to −10 dBm.
4. Turn on the RF output.
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