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 <ssaulojo...@gmail.com> 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. > > > > > > _______________________________________________ > > Discuss-gnuradio mailing list > > [hidden email] > > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > > > _______________________________________________ > Discuss-gnuradio mailing list > [hidden email] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > If you reply to this email, your message will be added to the discussion > below: > http://gnuradio.4.n7.nabble.com/Tag-preemption-USRP-sink-tp57286p57297.html > To start a new topic under GnuRadio, email [hidden email] > To unsubscribe from GnuRadio, click here. > NAML > > > > -- > 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. > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio -- Dipl.-Inform. Bastian Bloessl Distributed Embedded Systems Group University of Paderborn, Germany http://www.ccs-labs.org/~bloessl/ _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio