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Two-way communication or bidirectional communication between two nodes was first considered by Shannon. By involving a relay node between two nodes, the two-way relay channel has drawn great interest from numerous researchers due to its useful application scenarios in cellular and ad-hoc networks. Several studies showed that the sum-rate performance of the two-way relaying protocol significantly increases compared with that of one-way relay protocol. Recently, the two-way relay channel has been generalized in various network information flow settings.
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