178 Chapter 4
Basic Digital Operation
Modifying a FIR Filter Using the FIR Table Editor
Modifying a FIR Filter Using the FIR Table Editor
FIR filters stored in signal generator memory can easily be modified using the FIR table editor. You can load
the FIR table editor with coefficient values from user-defined FIR files stored in non-volatile memory or
from one of the default FIR filters. Then you can modify the values and store the new files.
Loading the Default Gaussian FIR File
1. Press Preset.
2. Press
Mode > CDMA > Arb CDMA2000 > More (1 of 2) > CDMA2000 Define.
3. Press
Filter > Define User FIR > More (1 of 2) > Load Default FIR > Gaussian.
4. Press
Filter BbT > 0.300 > Enter.
5. Press
Filter Symbols > 8 > Enter.
6. Press
Generate.
NOTE The actual oversample ratio during modulation is automatically selected by the instrument.
A value between 4 and 16 is chosen dependent on the symbol rate, the number of bits per
symbol of the modulation type, and the number of symbols.
7. Press
Display Impulse Response (refer to Figure 4-34).
Figure 4-34
8. Press
Return.
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