Re: [Discuss-gnuradio] modulation blocks propagate eob tag?

[Josh Blum]

On 02/25/2013 10:58 AM, Pablo Belzarena wrote:
> Hi, With gnuradio 3.6.3 I am using the gr_message_burst_source to generate
> messages (one message per second)  and set the bob and eob correctly. After
> this block I connect the following blocks to send bpsk modulated messages
> : packet_to_unpacket_bb, map_bb, chuncks_to_symbol, rrc_filter and the
> uhd_usrp_sink. However, I get many "U" characters in the screen, and many
> errors in the reception. I think that one or many blocks of the previous
> ones do not propagate the tags properly. I appreciate any help to solve
> this problem/question. Thank you.
> 

When the EOB goes through the modulator chain, there is some
interpolation in the item count, and the tag ends up not on the very
last item in the burst.

In this project, there is a block to correct this issue, this its called
packet gate or eob gate:
https://github.com/jmalsbury/pre-cog/wiki

-josh

> Best regards, Pablo Belzarena.
> 
> 
> 
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