Energy-Efficient Relaying Strategy with Network Coding in Two-Way Parallel Channels

Table 1

Energy-efficient relaying strategy with network coding in two-way parallel channels.

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Prior to the transmission in two-way relaying:

 opportunistic relay selection according to (3).

Start the transmission:

 at 𝑆₁ node, 𝑆₂ node:

 (1) decide whether to transmit source data by the direct link or by the relaying link according to (18) and (19);

 (2) if both (18) and (19) are satisfied, the forwarding threshold is calculated by formula (15), the transmit power of each source node is calculated by (16) and (17);

 Otherwise the direct transmission is preferred, the transmit power of each source node is computed by (16) and (17);

 (3) the source nodes start the transmission including broadcasting the message of transmit power and 𝛼_𝑡.

At the selected relay node (if the relaying is preferred):

 (1) decide whether to broadcast the network-coded data by (7);

 (2) work out the transmit power of relay node by (8).

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