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FMCOMMS5/ZC706: signal distortion

Question asked by kying on Mar 30, 2016
Latest reply on Apr 6, 2016 by ACozma

Currently, I am using FMCOMMS5/ZC706. I tried most of the Simulink examples from the wiki page and all of them worked.

When I test my own example of 20MHz WiFi signals, I find something weird.

 

This is the spectrum of the transmitted signal.

transmitted.jpg

 

This is the spectrum of the received signal:

received.jpg

 

Both the sample rates at the transmitter and receiver are 20M.

Then I check the received time-domain signal, I find the signal is duplicated every two samples. I don't why.

 

rxWaveform

    =

   1.0e+03 *

  -0.1510 + 0.2940i
  -0.4640 + 0.7420i
  -0.4640 + 0.7420i
  -0.1390 + 0.9630i
  -0.1390 + 0.9630i
   0.5070 + 0.1790i
   0.5070 + 0.1790i
   0.6360 - 0.4410i
   0.6360 - 0.4410i
  -0.1010 - 0.2600i
  -0.1010 - 0.2600i
   0.0390 + 0.5470i
   0.0390 + 0.5470i
   0.3350 + 0.1840i
   0.3350 + 0.1840i
  -0.5640 - 0.1700i
  -0.5640 - 0.1700i

......

dul.jpg

 

I am writing to inquiry the possible reasons.

 

 

Thanks,

Kai

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