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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