R&S SGT100A, User Manual

Page: 226 / 593

Signal Generator Settings
R&S
®
SGT100A
195 User Manual 1176.8674.02 ─ 07
c) Select "OK".
9. Select "Polynomial Coefficients > OK" to close the dialog.
Save/Recall Polynomial .............................................................................................. 195
System Coordinates ....................................................................................................195
Polynomial Order ........................................................................................................ 195
Polynomial coefficients ................................................................................................195
Apply, OK .................................................................................................................... 196
Save/Recall Polynomial
Accesses the "Save/Recall" dialog, i.e. the standard instrument function for storing and
recalling the dialog-related settings in a file. The provided navigation possibilities in the
dialog are self-explanatory.
The file name and the directory it is stored in are user-definable; the file extension is
however predefined.
The polynomial files are files with extension
*.dpd_poly
, see "File format of the poly-
nomial file" on page 181. The polynomial function is stored in Cartesian format.
Remote command:
[:SOURce<hw>]:IQ:DPD:SHAPing:POLYnomial:COEFficients:CATalog?
on page 456
[:SOURce<hw>]:IQ:DPD:SHAPing:POLYnomial:COEFficients:LOAD
on page 456
[:SOURce<hw>]:IQ:DPD:SHAPing:POLYnomial:COEFficients:STORe
on page 457
System Coordinates
Defines whether the polynomial function is defined in Cylindrical (Polar) or in Cartesian
coordinates.
Remote command:
n.a.
Polynomial Order
Defines the polynomial order
n
, that is the number of polynomial coefficients (see "Pol-
ynomial Function" on page 180).
The polynomial order defines the degree, complexity, and the number of terms in the
polynomial function.
Remote command:
See
[:SOURce<hw>]:IQ:DPD:SHAPing:POLYnomial:COEFficients
on page 456
Polynomial coefficients
Sets the polynomial coefficients a
0
to a
n
and b
0
to b
n
.
In "System Coordinates > Cylindrical", the polynomial coefficients b
0
to b
n
are
expressed in degrees.
The polynomial coefficients influence the shape of the predistortion function, see Fig-
ure 7-23 for an illustration of a polynomial function.
Applying Digital Predistortion