Re: [Discuss-gnuradio] USRP Competition

[Ed Criscuolo]

A "channel" is really just a high-level, somewhat arbitrary, agreement
berween a sender and a receiver on how to view a particular hunk of
spectrum.  It will vary, depending on the application.

For example, broadcast television divides its spectrum up into
6 MHz wide channels.  Broadcast FM, on the other hand, uses 200 KHz
wide channels.  And voice VHF uses 50 KHz wide channels.  There is no
innate concept of "channel"; its all in the application.

GnuRadio and the USRP are completely capable of implementing any of
these concepts of "channel", anywhere in the spectrum.  Its up to you.

But you'll be REALLY unpopular if you plop a 6 MHZ wide channel right
in the middle of the voice VHF band!  Not to mention earning a visit
from the FCC (if you're in the US)!

@(^.^)@  Ed



On 11/17/15 5:07 PM, Rama V wrote:
> Thanks for the reply Marcus. So this channel concept lies in GNU Radio.
> How can I really set from what channel I need to send the data or which
> channels are free for the transmission. Do I need to write any code for
> that? I am performing DARPA Spectrum competition wherein I need to
> perform data transmission between two USRP by sensing which channels are
> free and sending the data. Please suggest
> Thank you
>
> Regards,
> Dave
>
> On Nov 17, 2015 5:29 AM, "Marcus Müller" <address@hidden
> <mailto:address@hidden>> wrote:
>
>     Dave,
>
>     the USRP has no notion of "channels". It's a concept that you have
>     in your software that deals with the samples coming from the USRP.
>     You can configure the USRP to arbitrary center frequencies.
>
>     Best regards,
>     Marcus
>
>     On 16.11.2015 03:06, Rama V wrote:
> >     I would like to send data through specific channels among the
> >     USRP. How do I know what channels are available? I have tried to
> >     search for channels but I was not successful.  Are there any
> >     commands that I need to provide for the available channels? Kindly
> >     help.
> >     Thank you
> >
> >     Regards,
> >     Dave
> >
> >     On Nov 11, 2015 5:29 PM, "Rama V"
> >     <<mailto:address@hidden>address@hidden
> >     <mailto:address@hidden>> wrote:
> >
> >         Hey all,
> >         I would like to perform a specific application of competitive
> >         strategy(competition) with my two USRP available by detecting
> >         which channel is available for doing that. I have used the
> >         command of ./usrp_spectrum_sense.py 2.434G 2.438G which have
> >          shown me the results which is attached in the picture below.
> >         I would like to know of how to select which channel or
> >         frequency band is available for performing my competition and
> >         how will I be able to perform? Any suggestions are kindly
> >         appreciated. Sorry if I am not too brief with that. Thanks
> >
> >         Regards,
> >         Dave
> >
> >
> >
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