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Re: [Discuss-gnuradio] Confusion about Sample rate

From: Marcus D. Leech
Subject: Re: [Discuss-gnuradio] Confusion about Sample rate
Date: Sat, 01 Jun 2019 02:24:51 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0

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.

Kyeong Su Shin
Agreed.  I had missed the "for spectrum sensing" part.  There are a number of algorithms possible, with various performance trade-offs

보낸 사람: Marcus D. Leech <address@hidden> 대신 Discuss-gnuradio <address@hidden>
보낸 날짜: 2019년 6월 1일 토요일 오후 12:28:49
받는 사람: address@hidden
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.

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