how to load the I/Q waveform file into ADS

[wireless man]

Hi, All,
May you tell me how to load the I/Q waveform file into ADS for simulation? Thanks a lot.

 

[kayaoo]

In Ptolemy, the WaveForm component can be used to load the file. And the IQ mod can be used to build the final waveform.
In pure RF and analog environment, you can use DAC1 to load file.

 

[wireless man]

Thank you Kayaoo.
But I am still not clear about how to launch the Ptolemy, could pls give me some detailed guidance?
My I/Q files are .txt format.
I want to see the CCDF plot or spectrum of the signal.
Thanks again.

 

[kayaoo]

Maybe Matlab is a fitter tool for analyzing spectrum and CCDF. Anyway I tried to build a LoadIQ dsn for reference (It use "Readfile" component as it has no size limitation, you can copy it to your_project_path\networks\ and open it.).

 

[Manjunatha_hv]

Hello,

You should be able to do easily in AWR Visual System Simulator (VSS), where you can import IQ data in TXT format & add Spectrum & CCDF plots...There is an example ACPR_Test.emp ...This example demonstrates an ACPR, spectrum measurements for a CDMA IQ signal also you can add CCDF....


---manju---

 

[wireless man]

Maybe Matlab is a fitter tool for analyzing spectrum and CCDF. Anyway I tried to build a LoadIQ dsn for reference (It use "Readfile" component as it has no size limitation, you can copy it to your_project_path\networks\ and open it.).

Thanks Kayaoo for your .dsn file.
In your schematic, I loaded my I/Q file (.txt) and changed 2 items:
1. timestop=10 msec
2. Tstep=6.51e-8, (my sample rate 15.36MHz).
When the simulation is completed, I found that the CCDF plot is something different from our tested results. Did you meet the same problem? Is your simulated CCDF plot consistent with your measurent?
Thanks again.

---------- Post added at 05:06 ---------- Previous post was at 04:28 ----------

Hello,

You should be able to do easily in AWR Visual System Simulator (VSS), where you can import IQ data in TXT format & add Spectrum & CCDF plots...There is an example ACPR_Test.emp ...This example demonstrates an ACPR, spectrum measurements for a CDMA IQ signal also you can add CCDF....


---manju---

Dear manju,
Thanks for your reply first. I have two questions for your comment:
1. We don't have AWR VSS licesence, is there any licensence free evaluation version?
2. I found the ACPR_Test example in the ADS, the default signal source is PtRF_NADC, how can I load my I/Q waveform file into it?
Thank you so much.

 

[Manjunatha_hv]

Hello,

Yes they do have 30 days free full VSS version license register for trial or contact local AWR team...
https://awrcorp.com/register/evaluator.aspx

I was referring an example in VSS which has CDMA IQ signal in txt file format to demonstrate spectrum & CCDF measurements...

---manju---

 

[kayaoo]

In @DS the CCDF is ploted "percent vs dB" rather than "vs Mag". You can use the MeaEqn ccdf_norm=plot_vs(CCDF/100, pow(10,indep(CCDF)/20)) to plot the normal one. I compared it with matlab result they are just same.