A Simple Non-Coherent Physical-Layer Network Coding for Transmissions Over Two-Way Relay Channels
Physical-layer Network Coding (PNC) can effectively improve the overall throughput of a multi-hop cooperative network communicating over two-way relay channels. In this contribution, the authors present a novel non-coherent/differential PNC scheme, which inherits the advantages provided by conventional PNC. They show that, although the assisting relay node has no access to the Channel State Information (CSI), their Proposed Non-Coherent PNC detector with a low-complexity dual-branch structure is still capable of acquiring the network-coded symbols directly from a linearly superimposed signal. Compared with conventional two-way relay systems employing an inefficient four time-slot scheduling Protocol, Non-Coherent PNC aided bidirectional cooperation scheme is able to double the throughput by elimination of two transmission periods.