Why my demodulated pulse train look like superimposed on a low frequency sinusoid?
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I generated a pulse train from USRP device and transmited it at 3.5GHz the TX was coupled through a cable with Lecroy SDA 18000 device. I captured the whole signal down converted the signal but the recieved pulse train is looking like a alow frequency sinusoid where the pulse train is superimposed on it. How to solve this issue?![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1695986/image.jpeg)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1695986/image.jpeg)
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Mathieu NOE
le 16 Mai 2024
seems sig_amp signal is not very good - or ? if I zoom inside the signal I see mostly quantization effects - why is the signal amplitude so low ? I suspect the "bad" demodulation could come from a bad input (modulated) signal ?
these are the first 2000 samples of sig_amp
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1696871/image.png)
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