412 Chapter 15
W-CDMA Digital Modulation for Component Test
W-CDMA Downlink Modulation
W-CDMA Downlink Modulation
This section teaches you how to build W-CDMA downlink waveforms for testing component designs. The
waveforms are generated by the signal generator’s internal dual arbitrary waveform generator.
Activating a Predefined W-CDMA Downlink State
This procedure teaches you how to perform the following tasks:
• “Selecting a Predefined W-CDMA Setup” on page 412
• “Generating the Waveform” on page 412
• “Configuring the RF Output” on page 412
Selecting a Predefined W-CDMA Setup
1. Press
Preset.
2. Press
Mode > W-CDMA > Arb W-CDMA.
3. Press
W-CDMA Select > 3 DPCH.
This selects three predefined dedicated physical channels (DPCH) for a downlink waveform. The display
changes to DL WCDMA Setup: 3 DPCH. Downlink is the signal generator’s default setting for link
direction and, therefore, does not need to be set.
Generating the Waveform
Press
W-CDMA Off On until On is highlighted.
This generates the predefined 3 DPCH W-CDMA downlink 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.
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 predefined W-CDMA downlink signal is now available at the signal generator’s RF OUTPUT
connector.
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