Thank you Tom, I've installed gr-mac and try on running some flow graph. Some blocks there give output as message, but I want to take complex samples. How could I convert from message to complex? I used Message Source for that purpose but this error appears: *NameError: global name 'blocks_message_soure_0_msgg_in' is not defined *
Best, Hoang On Thu, Apr 24, 2014 at 8:42 PM, Tom Rondeau <t...@trondeau.com> wrote: > 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 > > > > -- *Hoang Ngo-Khac* Vietnam National University, Hanoi (VNU-H) - Univ. of Engineering and Technology (UET) Faculty of Electronics and Telecommunications (FET) Alternative email: hoangnk...@vnu.edu.vn Mobilephone: +84.163.682.7874
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