Keysight M9421A - 7.2.46 Memory Polynomial and Volterra Coefficients Files; 7.2.47 Sample file

7 Save/Recall/Print
7.2 Recall
mismatch between the file type and the destination data type
Annotation After recall is complete, an advisory is displayed in the message bar confirming the constellation state
was loaded
7.2.46 Memory Polynomial and Volterra Coefficients Files
This section includes details of:
–
"Sample file" on page 2375
–
"Coefficient Lengths" on page 2377
–
"How to apply the coefficients to signal" on page 2378
7.2.47 Sample file
The following is a sample file for a Volterra coefficients file, with Memory order = 4,
Nonlinear order = 9, Cross term order = 2, and Odd Order Only = True.
The file format is simple and explicit.
DPD_ModelType,Volterra
DPD_MemoryOrder,4
DPD_NonlinearOrder,9
DPD_CrossTermOrder,2
DPD_OddOrderOnly,True
DPDScale is average rms voltage of PA_Out waveform when extracting DPD model
coefficients and can be used with 3 steps:
1.
Calculate rms voltage ratio of PA_Out waveform to PA_In waveform which is
normalized
2.
Apply ratio got from step 1 on normalized PA_In waveform by multiplying
calculation
3.
Apply DPD model coefficients on waveform got from step 2 to get pre-distorted
waveform which then to be normalized before downloading to signal generator
DPD_Scale,0.0999999999999086
DPD Model coefficients:
(1.00223 + 0.00970452i)
(-0.001965723 - 0.01462447i)
WLAN Mode User's &Programmer's Reference 2375