[Discuss-gnuradio] Making new block with GRC or write python

Dear List,

To make my question on https://www.mail-archive.com/address@hidden/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

--
Ngo Khac Hoang

Faculty of Electronics and Telecommunications -

University of Engineering and Technology (UET) - Vietnam National University, Hanoi (VNU)

Vice-president of Student Association of UET

Alternative email: address@hidden

Mobilephone: +84.163.682.7874

From:	Hoang Ngo Khac
Subject:	[Discuss-gnuradio] Making new block with GRC or write python
Date:	Mon, 21 Apr 2014 15:47:38 +0700