Chapter 17 613
W-CDMA Downlink Digital Modulation for Receiver Test
Setting Up for a Compressed Mode Signal
Accessing the W-CDMA Modulation Format and Selecting Downlink
Unless stated otherwise, all procedures and tasks begin from the first-level W-CDMA softkey menu
accessed in this procedure.
1. Press
Mode > W-CDMA > Real Time W-CDMA.
This accesses the first-level W-CDMA softkey menu. From this display you can elect to set up the base
station parameters (downlink) or the user equipment (UE—uplink). See Figure 17-25 for the first-level
W-CDMA softkey menu display.
2. Using the
Link Down Up softkey, ensure that Down is highlighted as shown in Figure 17-25.
Figure 17-25 First-Level W-CDMA Softkey Menu
Setting Up the W-CDMA Signal Parameters
This procedure uses the factory preset parameters for all channels except for the DPCH.
1. Press
Link Control > 5 > Enter > PhyCH Setup.
2. Ensure that an item on line one (DPCH one) is highlighted.
The compressed mode feature operates with only DPCH one. If you were to try use DPCH two by itself
or in unison with DPCH one, an error message is generated.
3. Press
Ref Measure Setup > 12.2 kbps.
This configures DPCH one as a 12.2 kbps reference measurement channel according to the 3GPP
specifications. This reference measurement channel sets up two transport channels (DCH) and the
required DPCH parameters. Ref 12 now shows as the data type for DPCH one and is demonstrated in
Figure 17-26.
Current Transmit Diversity Mode is Set to None (off)
Ensure that Down
is Highlighted (Default)
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