Soft Network Coding in Wireless Relay Channels

In traditional designs of applying network coding in wireless two-way relay channels, network coding operates at upper layers above (including) the link layer and it requires the input packets to be correctly decoded at the physical layer. Different from that, this chapter investigates a physical layer wireless network coding scheme, which is referred to as soft network coding (SoftNC), where the relay nodes apply symbol-by-symbol soft decisions on the received signals from the two end nodes to come up with the network-coded information to be forwarded. We do not assume further channel coding on top of SoftNC at the relay node (channel coding is assumed at the end nodes). According to measures of the soft information adopted, two kinds of SoftNC are proposed: amplify-and-forward SoftNC (AF-SoftNC) and soft-bit-forward SoftNC (SBF-SoftNC).

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