565604.fig.001a
(a) Data packets in output queue (assume that data packets in any two sets meet coding condition)
565604.fig.001b
(b) XOR operation in 1 : 1 symmetric mode (a node needs to transmit three times)
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(c) XOR operation in asymmetric mode (a node only needs to transmit once)
Figure 1: Packet mixing of different methods.