Thanks Kyeong Su Shin. I've just checked the information. Regarding the 20MHz bandwidth check the previous responses as I think it is also to evit aliasing.
Regards Isaac T. El mié, 12 may 2021 a las 7:07, Kyeong Su Shin (<kss...@postech.ac.kr>) escribió: > Hello Issac: > > USRP uses I-Q sampling (there are some exceptions, though). When I-Q > sampling is used, the Nyquist bandwidth is* equal* to the sampling rate > of the stream, not half of it. So, the theoretical bandwidth of your 25MS/s > stream is 25 MHz, not 12.5 MHz. See > https://wiki.gnuradio.org/index.php/IQ_Complex_Tutorial and > https://dsp.stackexchange.com/questions/36927/bandwidth-with-complex-sampling > for further information. > > I don't know how Ettus Research came up with the 20 MHz figure. I guess > they are talking about the filter characteristics. You may experience some > aliasing issues at the edges of the spectrum, due to the filter > characteristics. > > Regards, > Kyeong Su Shin > ------------------------------ > *보낸 사람:* isaac mario tupac davila <isacct...@gmail.com> > *보낸 날짜:* 2021년 5월 12일 수요일 오전 7:15 > *받는 사람:* usrp-users@lists.ettus.com <usrp-users@lists.ettus.com> > *제목:* [USRP-users] Sampling rate and bandwidth - Usrp N210 & source block > > Hello community > > I'm Isaac. I'm dealing with some questions about the interpretation of > sampling rate and bandwidth in a USRP source block. > > What I understand is if I work with an USRP N210, my ADC works with a > 100MS/s. If I use a Gigabit Ethernet and a data type of 16bits, I could > receive in my host up to 25MS/s with a bandwidth of 20MHz. > https://kb.ettus.com/About_USRP_Bandwidths_and_Sampling_Rates > > My questions are: > > 1. If I can receive up to 25MS/s on my host, why my bandwidth is 20MHz? I > think It is up to 12.5MHz according to Nyquist. > > 2. Why is the sample rate value in the usrp source block equal to the > bandwidth I observe? I think this bandwidth should be the half according to > Nyquist too. https://wiki.gnuradio.org/index.php/USRP_Source > > I appreciate any help to clarify this concepts > > Regards > Isaac T. > >
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