Polynomial Coefficients; Normalized Data - Emerson R&S SGT100A User Manual

®
R&S SGT100A
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

For "Shaping > Polynomial", accesses a dialog to describe the predistortion function as
a polynomial function, see
on page 211.

Normalized Data

For "Shaping > Normalized", accesses a dialog to describe the predistortion function
as a normalized data, see
6.6.3.3 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.
Access:
1. Select "I/Q Mod > Digital Predistortion > AM/AM AM/PM > Predistortion Settings".
2. Select "Shaping > From Table".
3. Select "AM/AM > Shaping Table > Predistortion AM/AM Shaping File > New"
4. Enter the "File Name", e.g. My_DPD_AM-AM
The "Predistortion AM/AM Shaping File" dialog closes.
The "Shaping Table > My_DPD_AM-AM" confirms that the newly created file is
assigned.
5. Select "Shaping Table > Predistortion AM/AM Shaping File > Edit"
6. Define the value pairs "Pin/dBm" and "ΔPower/dB". The order is uncritical.
7. Select "Save".
The instrument loads the configured values automatically and displays the function
of the delta correction values.
8. Select "Predistortion Settings > Interpolation > Linear".
The display confirms the used interpolation.
User Manual 1176.8674.02 ─ 12
Selects and loads an existing file.
Creates a file.
Access a standard built-in table editor, see
distortion table settings",
Chapter 6.6.3.4, "Polynomial coefficients
Chapter 6.6.3.5, "Normalized data
Signal generator settings
Applying digital predistortion
Chapter 6.6.3.3, "Edit pre-
on page 210.
settings",
on page 510
on page 510
on page 510
on page 510
settings",
on page 214.
210