Re : Re: Measure EVM of DSSS BPSK,OOK

[Brian_Esque]

Has anyone ever tried to measure EVM of a BPSK DSSS signal on an OOK transmission? I have 19200 bps OOK data with 1.2Mcps BPSK spreading want to measure the EVM of each ON burst occurs randomly at intervals of 50 us. How would you trigger/acquire each burst?

[Brian_Esque]

These bursts have a preamble of 4.8 mS. Is it possible to trigger on the preamble, and collect a time domain waveform in such a way that you could measure the difference in the ON/OFF power of the OOK transmission? Something like a zerospan measurement with a spectrum analyzer?

[Andy_Hinde]

What hardware and software are you using?

[Brian_Esque]

Sorry about that. I'm using a PXI 5660 with LabView Spectral Measurement and Modulation Toolkits. I would also like to measure the modulation depth of the 19200 data, and capture/demod and entire 12 mS burst. I can't quite figure out how to get started with the SW.

[Andy_Hinde]

Here is an example of how to do zero span with the 5660. For demodulation, I would start woth the examples installed by Modulation Toolkit at:
...\\examples\Modulation

[etudiant2007]

please help me i want to simulate WCDMA and i havent where i start please if you a solution  for me send me the VIs 

[David S.]

Hi etudiant2007 -

WCDMA is not a trivial transmission scheme, and unfortunately there aren't any canned examples that I can provide to you.  Your best bet is to start with the Modulation Toolkit to build the chirp packets that will be generated.  I have some questions, too:

1. Which version of LabVIEW are you working with?
2. Do you have the Modulation Toolkit?
3. What hardware are you using?  (NI 5670 or 5671?)

I also noticed that you posted simultaneously to our French forum with a similar question.  If you get any help in that language from your other thread, we'd appreciate it if you could post back here with things you learned, so English-speakers can gain from the knowledge too!

[Andy_Hinde]

Hello,

National Instruments provides Modulation Toolkit, containing modulation agorithms. WCDMA is an example of a standard or protocol, which the modulation scheme is only one part of. Currently there are no SW tools available that provide support for WCDMA protocol simulation from National Instruments.

Regards,

Andy Hinde

National Instruments

[etudiant2007]

about  my simulation i have ni modulation tools kit 2.0 , iwant my simulation like MIMO-OFDM , i have not a hardware just software. i work with LABVIEW  8.0 , i want  the UPLINK  and DOWNLINK  for my simulation . if you have a solution or  simulator , i want it for this friday please i need it

[etudiant2007]

this thesis probably  help you to understand me more what i want but in this thesis he used GAUSSIAN NOISE  but me  I WaNT MIMO-WCDMA