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Re: [Discuss-gnuradio] Tag preemption USRP sink


From: Saulo Queiroz
Subject: Re: [Discuss-gnuradio] Tag preemption USRP sink
Date: Tue, 15 Dec 2015 19:06:29 +0000

Many thanks Bastian!

I checked the loopback version and it seems to work very well.

I'll check over-the-air and report here!

On 15 December 2015 at 19:04, Bastian Bloessl <address@hidden> wrote:
Hi,

I replaced the Frequency Xlating FFT filters with FIR filters, used the Low-Pass Filter Taps block to generate taps (since I can’t get my head around this notation), and removed the filter from the first conversion.

Now, it seems to work. At least it receives frames. If you still have problems I can send you the flow graph.

Best,
Bastian


> On 15 Dec 2015, at 10:05, Saulo Queiroz <address@hidden> wrote:
>
> Each stream has been shiffted with the xlating block.
> The intention is to "split" a 20 MHz wide analog channel into two of 10 MHz.
> Each 10 MHz channel transmit its own ofdm frame.
> I attached the flowgraph for more details.
>
> thanks in advance.
>
> On 15 December 2015 at 17:42, Martin Braun-2 [via GnuRadio] <[hidden email]> wrote:
> tP indicates you're using corrupt tagged streams, maybe your add block
> is overlaying them? I'm also not entirely sure what you mean by
> 'simultaneous parallel transmissions'. Are they on different
> frequencies? Are you mixing them together in baseband?
>
> Cheers,
> Martin
>
>
> On 15.12.2015 04:10, Saulo Queiroz wrote:
>
> > Hi all,
> >
> > I'm trying to Tx a same tagged stream simultaneously through two analog
> > orthogonal channels.
> >
> > The flow path of each stream copy is: resampling, adjust tag lenght and
> > xlating FFT filter (with shifting). After this I take the output of each
> > filter and put into and add block then to the USRP sink. I also do the
> > reverse process at the Rx side.
> > With some packets are successfuly receive but with so many losses. At
> > the Tx side I get many "tP". Any tip on how to set simultaneous parallel
> > transmissions without this?
> >
> > I'm using gr-ieee80211 (thanks Bastian and team :) that has worked
> > nicely with the single channel scenario.
> >
> > thanks in advance
> >
> > BR
> >
> > --
> > Saulo Jorge bq
> > - "Beware of bugs in the above code; I have only proved it correct, not
> > tried it."
> > Donald Knuth.
> >
> >
> > _______________________________________________
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> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> >
>
>
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> --
> Saulo Jorge bq
> - "Beware of bugs in the above code; I have only proved it correct, not tried it."
> Donald Knuth.
>
>  wifi_tx_rx_loopback.grc (134K) Download Attachment
>
> View this message in context: Re: Tag preemption USRP sink
> Sent from the GnuRadio mailing list archive at Nabble.com.
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--
Dipl.-Inform. Bastian Bloessl
Distributed Embedded Systems Group
University of Paderborn, Germany
http://www.ccs-labs.org/~bloessl/




--
Saulo Jorge bq
"Beware of bugs in the above code; I have only proved it correct, not tried it." 
Donald Knuth.

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