
236 Chapter 8
CDMA Digital Modulation
Applying a User-Defined FIR Filter to a cdma2000 Waveform
Applying a User-Defined FIR Filter to a cdma2000
Waveform
Custom FIR filters can be created using the FIR table editor feature or they can be created
externally and downloaded into signal generator memory. Once a filter is stored in memory,
you can select it for use with a custom modulation state. This example requires that at least
one FIR file already be stored in memory. For an example of creating and storing a FIR filter,
see “Creating a User-Defined FIR Filter Using the FIR Table Editor” on page 120.
1. Press
Preset.
2. Press
Mode > CDMA > Arb CDMA2000 > More (1 of 2) > CDMA2000 Define.
3. Press
Filter > Select > User FIR.
In this example, there are two FIR files listed: NEWFIR1 and NEWFIR2. (These files were
created in the examples in Chapter 3, “Basic Digital Operation,” on page 61.)
Figure 8-16
4. Scroll down in the list until NEWFIR2 is highlighted.
5. Press
Select File.
The highlighted filter is now selected for use in your custom modulation state, as shown in
Figure 8-17 on page 237.
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