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I am testing the transmission and receiving signal using two USRP N210. The communication setting as follows:

fc = 2.43e9;        % Hz
bW = 5e6;
fs = 5e6;           % tx_Sampling Rate = rx_Sampling Rate

From Time and Frequency Windows in GNURadio, I think I've received the signal. For the signal I will be processing with, there are some confused questions for me. One is the N210's main clock rate is 100MHz, the setting Sampling rate is 5MHz. Did the USRP N210 "use" each transmission baseband samples 20 times when processing the baseband signal I emit?] The example like this. enter image description here

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1 Answer 1

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Did the USRP N210 "use" each transmission baseband samples 20 times when processing the baseband signal I emit?

No, it correctly interpolates the samples twentyfold. (I.e., it uses an appropriate low-pass filter impulse response as interpolation filter, not a sample-and-hold.)

That's done on the FPGA in the N210.

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  • $\begingroup$ Thanks a lot for your answer. Is there any similarity between the interpolation of this processing step and the DUC of the signal transmission ? $\endgroup$ Apr 30 at 7:33
  • $\begingroup$ It's exactly that. $\endgroup$ Apr 30 at 10:25

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