Re: [Discuss-gnuradio] Tag preemption USRP sink

[Saulo Queiroz]

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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--

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

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