[Discuss-gnuradio] Re: Re: Packet Transmission

[William Sherman]

Hmm:

I have a working program which has a USRP perform TX & RX on the one 
radio, using transmit_path & receive_path. With two USRPs I can do 
RTS/CTS and transmit a packet with ACK. My receive_path was not picking 
up its own transmit_path's packet transmissions erroneously. This was 
even though both flowgraphs were running (in parallel) at the same time.

I only became aware of the problem that my RX should be picking up the 
TX from the same radio after reading Crohas's paper. My RX doesn't pick 
up my TX though (I never get "packet has wrong address" - I only 
sometimes get bad packets due likely to noise interference).

I did have problems before when I didn't have real time scheduling: in 
that case  my receiver was not able to receive anything.

So um what's going on in gnuradio. According to Crohas my RX should be 
picking up TX from my own radio, but it's not. Does USRP only allow one 
RX or TX operation at the same time or what? (I have tried with -R -T on 
the same antenna, and -R -T on different antennaes). Or is it something 
to do with scheduling???

I am very confused. My program is working but it shouldn't be working 
according to the literature. Is there good documentation in this area?

Are there other implementations of TX/RX on the same USRP? If so they 
should have encountered the same problem of erroneous self-pickup, and 
found some way to deal with it.
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