
Chapter 13 309
W-CDMA Digital Modulation for Component Test
W-CDMA Uplink Modulation
Clipping the Waveform
1. Press
Mode Setup > More (1 of 2) > ARB Setup > Waveform Utilities > Clipping.
2. Press
Clip |I+jQ| To > 80 > %.
The waveform is now set to be clipped at 80 percent of its peak value.
NOTE If the waveform is active (W-CDMA Off On set to On), clipping settings are not
applied until you press the Apply To Waveform softkey.
Generating the Waveform
Press
Mode Setup > W-CDMA Off On until On is highlighted.
This generates a waveform with the custom W-CDMA uplink state created in the previous
sections. The display changes to UL WCDMA Setup: DPCCH (Modified). 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 custom CDMA state to the signal generator’s non-volatile
memory, see “Storing a W-CDMA Downlink/Uplink State” on page 299.
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