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Agilent N5161A/62A/81A/82A/83A MXG Signal Generators User’s Guide 271
Custom Digital Modulation (Option 431)
Using Finite Impulse Response (FIR) Filters in ARB Custom Modulation
Using Finite Impulse Response (FIR) Filters in ARB Custom Modulation
Finite Impulse Response filters can be used to refine the transitions between symbol decision points
of the generated waveforms.
Figure 11-12 Filter Menu
Creating a User–Defined FIR Filter Using the FIR Table Editor
In this procedure, you use the FIR Values table editor to create and store an 8–symbol, windowed
sync function filter with an oversample ratio of 4.
Accessing the Table Editor
1. Press Preset.
2. Press Mode > ARB Custom Modulation > Single Carrier Setup > Select > Nyquist.
3. Press Filter > Define User FIR.
4. Press More 1 of 2 > Delete All Rows > Confirm Delete of All Rows.
This will initialize the table editor as shown in Figure 11-13.
Mode > ARB Custom Modulation > Single Carrier Setup > Filter
This
replaces the
current FIR
filter with the
factory
installed
default filter
settings for
the current
modulation
type.
This softkey changes, depending
on the selected filter–type.
Available only when the filter selected =
Root Nyquist or Nyquist
Available only when the
filter selected = Gaussian
page 276
Only applies to Dual
ARB Modulation. Refer
to page 131.
For details on each key, use key help as described on page 42.
Opens the IS–95
filter selection
menu.