[Hackrf-dev] Using hackrf as CCA noise generator

[Mike Walters]

Hi Ben,

The HackRF should be quite capable of doing that. I recommend using the
`osmocom_siggen` command-line tool that comes with gr-osmosdr. Run
`osmocom-siggen -s 20M` for full sample-rate, pick your frequency, set to
uniform noise, set whatever bandwidth you want, and raise the gains.

I've just tested it out here, here are a couple of pictures of my setup so
you know roughly what to expect: https://imgur.com/a/DcgIZPl

Cheers,
Mike

On Wed, 17 Apr 2019 at 14:04, Ben Greear <greearb at candelatech.com> wrote:

> Hello,
>
> We are trying to use a hackrf to generate noise to test
> that our wifi radio properly does CCA and quits transmitting
> when the on-channel noise is above a certain threshold (about -70dB)
>
> In initial testing, however, our radio appears to totally ignore
> the RF noise from the hackrf.  One reason might be that the hackrf
> is outputting a very narrow band of noise (about 500Khz), where we might
> need a full 20Mhz of noise to make CCA work reliably.  Is there
> a good way to make the hackrf output a wider band of noise?
>
> Another thought I had is that maybe pure RF noise is not enough
> and there has to be some sort of wifi-like modulation to make CCA work?
>
> (And of course, our AP implementation could be busted...we will
> continue to try to tie-break that.)
>
> And, does anyone have any experience with doing this type of testing
> that they can share?
>
> Thanks,
> Ben
>
> --
> Ben Greear <greearb at candelatech.com>
> Candela Technologies Inc  http://www.candelatech.com
>
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