On Mon, Apr 21, 2014 at 4:47 AM, Hoang Ngo Khac <khachoang1...@gmail.com>wrote:
> Dear List, > > To make my question on > https://www.mail-archive.com/discuss-gnuradio@gnu.org/msg48001.html more > clear, I would like to add more details. > > I want to implement a bidirectional two-way relaying network using 3 USRPs > and GNU Radio. The model is at *attachment 1. * > *1st slot: *Two end nodes (A, B) send information to relay node (R) in > different frequencies. Relay node receives both and make a bitwise XOR > mapping. > *2nd slot:* Relay node sends the XORed message to end nodes. Each end > nodes performs another XOR on this message and its original message to > extract information from other end node. > > For time synchronization, the following protocol using a beacon added in > relay node has been proposed: > *Node A, B *(see in *attachment 2*): > + Wait for beacon > + Receive beacon > + Transmit message > + Wait for message from relay > + Receive message from relay > + Restart > *Node R *(see in *attachment 3*): > + Transmit the beacon > + Wait for the two messages to be received, > + Check for error > + Combine the messages, > + Transmit the combined message, > + Restart > > My question is should I make this process by making some new blocks in GRC > or writing python script? In addition, how to tell a RX/TX chain to > start/stop since these USRPs work in half-duplex mode? > > Thank you so much. > Hoang > Take a look at gr-mac: https://github.com/jmalsbury/gr-mac It's all done in GRC and would be an appropriate starting point. GRC produces Python code, so you can always take that and work in Python when you get into a place with GRC that you can't do what you want. Tom
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