Dear all,
I have a question related to the parameters Samp Rate (Sps) and
Bandwidth which can be found on the UHD USRP source and sink GNU radio
blocks.
If I want to calculate the bandwidth of a modulated signal (QPSK for
example), the standard equation to use is usually:
B = (1+roll-off)*sample_rate
However, I have checked that the bandwidth in GNU radio is calculated by:
B = (1+roll-off) * Bandwidth /number_symbols
Where Bandwidth is the USRP block parameter and number_symbols is 4 in
this case (QPSK). Therefore, the Samp Rate parameter from the
UHD USRP source and sink GNU radio blocks does not have to do with the
calculation of the signal bandwidth in frequency domain. I would be
really glad if someone can explain to me the difference between these
two parameters ("Samp rate" and "Bandwidth"). I have already read the
documentation but I still do not really understand it.
Thank you very much and sorry for the I guess basic question.
Best regards,
Maria Jesus
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