Thank you for the responses. I was planning to use USRP B200 which allows a BW of 56MHz. Yes. I just want to sense the WIFI spectrum. I came across various sensing techniques like energy sensing, cyclostationarity, covariance based etc. Hope I am right. But I didn't get how performance tradeoffs affect sample rate?
J. Varghese On 12:09PM, Sat 01-Jun-2019 Marcus D. Leech <patchvonbraun <patchvonbr...@gmail.com>@ <patchvonbr...@gmail.com>gmail.com <patchvonbr...@gmail.com> wrote: > > > > On 06/01/2019 02:03 AM, Kyeong Su Shin wrote: > > >> >> To whom it may concern: >> >> While I mostly concur with Marcus's response, I would like to note that maybe you can get away with a lower sampling rate (lower than the Nyquist rate) since you are working on spectrum sensing (not on decoding the full WiFi signal). >> >> Actual sampling rate needed by your application will depend on the spectrum sensing algorithm and various performance factors that you want to use. >> >> Regards, >> Kyeong Su Shin > > Agreed. I had missed the "for spectrum sensing" part. There are a number of algorithms possible, with various performance trade-offs > possible. > > > > >> ________________________________ *>> 보낸 사람:* Marcus D. Leech < <patchvonbr...@gmail.com>patchvonbraun <patchvonbr...@gmail.com>@ <patchvonbr...@gmail.com>gmail.com <patchvonbr...@gmail.com>> <patchvonbr...@gmail.com> 대신 Discuss-gnuradio <discuss- <discuss-gnuradio-bounces+ksshin=postech.ac...@gnu.org>gnuradio <discuss-gnuradio-bounces+ksshin=postech.ac...@gnu.org>-bounces+ <discuss-gnuradio-bounces+ksshin=postech.ac...@gnu.org>ksshin <discuss-gnuradio-bounces+ksshin=postech.ac...@gnu.org>= <discuss-gnuradio-bounces+ksshin=postech.ac...@gnu.org>postech.ac.kr <discuss-gnuradio-bounces+ksshin=postech.ac...@gnu.org>@ <discuss-gnuradio-bounces+ksshin=postech.ac...@gnu.org>gnu.org <discuss-gnuradio-bounces+ksshin=postech.ac...@gnu.org>> <discuss-gnuradio-bounces+ksshin=postech.ac...@gnu.org> *>> 보낸 날짜:* 2019년 6월 1일 토요일 오후 12:28:49 *>> 받는 사람:* discuss- <discuss-gnuradio@gnu.org>gnuradio <discuss-gnuradio@gnu.org>@ <discuss-gnuradio@gnu.org>gnu.org <discuss-gnuradio@gnu.org> *>> 제목:* Re: [Discuss-gnuradio] Confusion about Sample rate >> >> On 05/31/2019 11:21 PM, Jiji Varghese wrote: > > >>> >>> I am trying to store WiFi signals samples in a file using file sink block, using GNU radio, for spectrum sensing. I know that a single WiFi channel has a bandwidth of 20-22 MHz. So should I use the sample rate in GNU radio block to 40e6 - 44e6 or can I use a lower value? Can I use 1e6 as sampling rate? >>> What is the lower bound for the sample rate in GNU block? >>> >>> I am confused about giving the sample rate. >>> >>> J. Varghese >>> >> A couple of different issues here: >> >> GnuRadio *generally* deals with *complex samples*. Complex sampling satisfies the Nyquist Sampling Criterion in a way that allows you to >> run those samples at a rate == bandwidth (more or less). >> >> Gnu Radio doesn't care, per se, about sample rates, and will pass your request on to the underlying *HARDWARE*. The hardware will, most >> definitely have limits and policies with respect to sample rate, and to answer the question "what sample rates are allowed" you need to refer >> to the hardware you're using. >> >> If you don't understand what the Nyquist Sampling Criterion is, you should definitely spend some time researching that, and how it relates >> to the kinds of things you might be wanting to do with samples, and why 1e6 is not an appropriate sampling rate for a signal with an >> information bandwidth of 22MHz. >> >> >> >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> Discuss- <Discuss-gnuradio@gnu.org>gnuradio <Discuss-gnuradio@gnu.org>@ <Discuss-gnuradio@gnu.org>gnu.org <Discuss-gnuradio@gnu.org> >> <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio>https <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio>:// <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio>lists.gnu.org <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio>/mailman/ <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio>listinfo <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio>/discuss- <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio>gnuradio <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio> > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss- <Discuss-gnuradio@gnu.org>gnuradio <Discuss-gnuradio@gnu.org>@ <Discuss-gnuradio@gnu.org>gnu.org <Discuss-gnuradio@gnu.org> > <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio>https <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio>:// <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio>lists.gnu.org <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio>/mailman/ <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio>listinfo <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio>/discuss- <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio>gnuradio <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio>
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