Figure 1
From: Opportunistic Adaptive Transmission for Network Coding Using Nonbinary LDPC Codes
Mobile wireless multihop network. Two different information flows exist between two generator-destination pairs 
and 
. Thin dashed lines represent wireless connectivity among nodes while thick lines represent packet transmissions. In the first time slot generator 
1 and 
2 broadcast their packets 
and 
, respectively, (thick dash-dotted line). In the second time slot, node 6 broadcasts packet 
(thick dotted line) received in previous slot. In the third time slot, node 5 broadcasts the linear combination of packets 
and 
(
). Destination nodes 
and 
can, respectively, obtain packets 
and 
from 
using their knowledge about packets 
and 
overheard during previous transmissions.