Re: [Discuss-gnuradio] Transmit time synchronization

[Jeff Long]

On 10/13/2014 08:57 AM, Muhammad Shahmeer Omar wrote:
> sorry disregard previous mail
>
> I am trying to implement a multi-relay cooperative network using
> gnuradio and USRP B200. I cannot figure out how to synchronize the relay
> transmissions using GNU-Radio (without editing FPGA code or using
> external clock source).
>
> I created an out of tree module derived from the tags_demo example of
> uhd but i encounter a problem with the packet encoder.
>
> my flow graph is something like
>
> USRP source ---> tagging_block ---> DBPSK demod -->packet decoder -->
> encoder --> mod --> USRP sink.
>
> when i attach tag debug block, i see that the packet decoder is not
> propogating my tags. Are their any substitutes to the encoder or is

The packet_decoder block has a message queue in the middle of its 
implementation, so tags are not propagated. Not sure how to get around this.

> there any problem with my code which is attached. Any help would be very
> welcome. Thanks!
>
>
>
> On Mon, Oct 13, 2014 at 5:53 AM, Muhammad Shahmeer Omar
> <address@hidden <mailto:address@hidden>> wrote:
>
>     Hello all,
>
>     I am trying to implement a multi-relay cooperative network using
>     gnuradio and USRP B200. I cannot figure out how to synchronize the
>     relay transmissions using GNU-Radio (without editing FPGA code or
>     using external clock source).
>
>     I created an out of tree module derived from the tags_demo example
>     of uhd but i encounter a problem with the packet encoder.
>
>     my flow graph is something like
>
>     USRP source ---> tagging_block ---> DBPSK demod -->packet decoder
>     --> encoder --> mod --> USRP sink.
>
>
>
>
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