We are doing a test which consists in sending a waveform from Matlab to the signal generator SMB100A and sending it through a cable to the r&s spectrum analyzer just to have a channel. We set the trigger manually in the signal generator in the restart mode, then we set the frequency and the chip rate in our Matlab code as well as the buffer size and the connections. Finally, we read the waveform, which is already stored in the signal generator , and we set ARB state ON: we are using the arbitrary customized digital modulation. However, the channel impulse response is different every time that we run the test: there is a portion of the signal that looks like an offset; we think the signal is shifted because of an inversion in the phase. Any clue about why this happens?

Channel 1

Channel 2

  • $\begingroup$ It would help me to understand what is going on if you could post some pictures of the waveforms that you are talking about. $\endgroup$
    – Jim Clay
    Oct 26, 2014 at 21:47
  • $\begingroup$ I cant post picture with my "reputation" buddy :-( $\endgroup$ Oct 26, 2014 at 22:27
  • 2
    $\begingroup$ Post them somewhere on the web and link to them. One of us will probably edit your post to put them in directly. $\endgroup$
    – Jim Clay
    Oct 26, 2014 at 23:03
  • $\begingroup$ Hi again, I upload the different channel impulse responses that I get when sending 16 ones: es.tinypic.com/r/30lpjqo/8 and es.tinypic.com/r/3sgi8/8 I hope this helps. Thanks $\endgroup$ Oct 27, 2014 at 18:34


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