7 Save/Recall/Print
7.2 Recall
N7608C Custom IQ constellation file format and VMA Digital Demod measurement
Custom IQ. To use a recalled constellation, change the PDSCH/PUSCH MCS to -1,
then change the modulation format to Custom IQ.
A preloaded Constellation State file can be found under VMA directory:
My Documents\VMA\data\DDEMOD\ConstlnState
Remote Command
:MMEMory:LOAD:EVM:CONStln:STATe <string>
Example Import the constellation state from the file myConstlnState.txt in the current path:
:MMEM:LOAD:EVM:CONS:STAT "myConstlnState.txt"
Dependencies Only appears in 5GNR Mode, in the Modulation Analysis measurement
Errors are reported if the file is empty or missing, or if the file type does not match, or if there is a
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
7.2.58 Memory Polynomial and Volterra Coefficients Files
This section includes details of:
–
"Sample file" on page 2350
–
"Coefficient Lengths" on page 2352
–
"How to apply the coefficients to signal" on page 2353
7.2.59 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:
2350 Vector Modulation Analyzer Mode User's &Programmer's Reference
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