For the past few weeks, I have been trying to send a Zaddof Chu signal using a vector signal generator, and receive it using a signal analyzer. Both devices are made by R&S.

However, the signal I receive is extremely distorted even at very high SNR's. I would really appreciate any hints at where the issue could be originating from.

Here is a the I and Q signals of the 21 samples ZC sequence, upsampled by 8 transmitted at $10\textrm{ kHz}$ base bandwidth and $2.4\textrm{ GHz}$ carrier frequency.

  • I signal: enter image description here

  • Q signal: enter image description here

And here is the received signal sampled at $1.6\textrm{ MHz}$.

Received I signal: enter image description here

Received Q signal: enter image description here


After using the same clock for both devices, and using a coaxial cable to connect them both, I was able to receive an almost perfect real part, but the imaginary part is very distorted.

  • $\begingroup$ You might be best off contacting the support staff for your equipment, but what power level are you using? Perhaps you're getting some amplifier saturation or ADC clipping. $\endgroup$ – Jason R May 11 '16 at 11:38
  • $\begingroup$ I just tried to reduce the amplitude, but the output was similar. $\endgroup$ – user304584 May 11 '16 at 12:23
  • $\begingroup$ how do you generate your signals? are you using the customized modulation or the ARB waveform? $\endgroup$ – Behind The Sciences May 12 '16 at 6:08
  • $\begingroup$ I am using the ARB waveform. I generate the signal using matlab, then I convert it using R&S ARB Toolbox PLUS, and load it using a USB on the signal generator which forwards the I and Q streams to another signal generator that up converts the signal to the RF frequency. $\endgroup$ – user304584 May 12 '16 at 17:59

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