Edit Predistortion Table Settings; Shaping Table; Polynomial Coefficients; Normalized Data - R&S SGT100A User Manual

®
R&S SGT100A
In "Level Reference > Before/After DPD" mode, the range is limited by the current PEP
of the signal, see
Remote command:
[:SOURce<hw>]:IQ:DPD:GAIN:PRE

Shaping Table

Accesses the standard "Predistortion Select" dialog with functions to define a new
shaping table file, select, or edit an existing one.
The shaping table files are files with predefined extension and file format, see
mat of the correction table file"
You can create a shaping table externally or internally.
"Select"
"New"
"Edit"
Remote command:
For AM/AM distortions:
[:SOURce<hw>]:IQ:DPD:SHAPing:TABLe:AMAM:FILE:CATalog?
[:SOURce<hw>]:IQ:DPD:SHAPing:TABLe:AMAM:FILE[:SELect]
For AM/PM distortions:
[:SOURce<hw>]:IQ:DPD:SHAPing:TABLe:AMPM:FILE:CATalog?
[:SOURce<hw>]:IQ:DPD:SHAPing:TABLe:AMPM:FILE[:SELect]

Polynomial Coefficients

Accesses a dialog to describe the predistortion function as a polynomial function, see
Chapter 7.6.3.4, "Polynomial Coefficients

Normalized Data

Accesses a dialog to describe the predistortion function as a normalized data, see
Chapter 7.6.3.5, "Normalized Data
7.6.3.3

Edit Predistortion Table Settings

The predistortion table is an internal editor where you define the correction values,
ΔPower and ΔPhase, in form of a look-up table.
To access the internal table editor
1. Select "I/Q Mod > Digital Predistortion > AM/AM AM/PM".
2. Select "Digital Predistortion AM/AM AM/PM > Predistortion Settings".
3. Select "Shaping > From Table".
4. Select "AM/AM > Shaping Table > Predistortion AM/AM Shaping File > New"
5. Enter the "File Name", e.g. My_DPD_AM-AM
The "Predistortion AM/AM Shaping File" dialog closes.
User Manual 1176.8674.02 ─ 07
Figure 7-22.
on page 182.
Selects and loads an existing file
Creates a file
Access a standard built-in table editor, see
distortion Table Settings",
Settings",
Signal Generator Settings
Applying Digital Predistortion
on page 454
Chapter 7.6.3.3, "Edit Pre-
on page 191.
Settings", on page 193.
on page 196.
"File for-
on page 454
on page 455
on page 454
on page 455
191