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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 ? $\endgroup$
    – Ze Zh
    Apr 30, 2022 at 7:33
  • $\begingroup$ It's exactly that. $\endgroup$ Apr 30, 2022 at 10:25
  • $\begingroup$ Hey @zechuanzhang you just removed the upvote here – why? I'd argue I'm not wrong, having done technical work with, and on the N210 itself, as well as paid tech support for roughly a decade. $\endgroup$ Dec 4, 2022 at 12:30
  • $\begingroup$ Hi Marcus. Sorry for canceling the answer reception by mistake. I am using MATLAB to simulate the DUC and DDC process of N210. I got some understanding and also encountered some doubts. I revisited the question and thought it might be a bit vague. Maybe I should rephrase the question? $\endgroup$
    – Ze Zh
    Dec 5, 2022 at 14:02

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