Chapter 15 417
W-CDMA Digital Modulation for Component Test
W-CDMA Downlink Modulation
Generating the Waveform
Press
Mode Setup > W-CDMA Off On until On is highlighted.
This generates a waveform with the custom W-CDMA downlink state created in the previous sections. The
display changes to DL WCDMA Setup: 1 DPCH (Modified). Note that 1 DPCH refers to the predefined
configuration, not the number of channels in the user-modified waveform.
During waveform generation, the WCDMA and I/Q annunciators appear and the waveform is stored in
volatile ARB memory. The waveform is now modulating the RF carrier.
For instructions on storing this user-defined W-CDMA state to the signal generator’s non-volatile memory,
see “Storing a W-CDMA Downlink/Uplink State” on page 417.
Applying Channel Modifications to an Active Waveform
To apply channel modifications to an active waveform (
W-CDMA Off On set to On), you must press the Apply
Channel Setup
softkey to force the updated waveform to generate. For example, perform the following steps:
1. Press
W-CDMA Define > Edit Channel Setup.
2. Move the cursor to row 2.
3. Press
Delete Row > Return > Apply Channel Setup.
Notice that the waveform is regenerated to include the modification of the deleted row. Any changes made in
the Edit Channel Setup table editor while a waveform is active will not be applied until the
Apply Channel
Setup
softkey is pressed.
Configuring the RF Output
1. Set the RF output frequency to 2.17 GHz.
2. Set the output amplitude to −10 dBm.
3. Press
RF On/Off until On is highlighted.
The custom W-CDMA downlink signal is now available at the signal generator’s RF OUTPUT connector.
Storing a W-CDMA Downlink/Uplink State
This procedure teaches you how to store a user-defined W-CDMA state. If you have not created a W-CDMA
state, complete the steps in the previous section, “Creating a User-Defined W-CDMA Downlink State” on
page 413.
1. Press
Mode Setup to return to the top-level W-CDMA menu, where W-CDMA Off On is the first softkey.
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