thanks for the input Jeff. I am fairly new to GNURadio so any suggestions on how i can create the said network. My main goal is to implement the multiple relay network and demonstrate its advantages. As i understand it, a differential modulation scheme is my only option if i want to achieve diversity gain on rx without having to estimate the channel. Any suggestions on how i go about doing this?
On Mon, Oct 13, 2014 at 7:05 PM, Jeff Long <[email protected]> wrote: > 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 >> <[email protected] <mailto:[email protected]>> 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. >> >> >> >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> [email protected] >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> >> > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >
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