Coded Bidirectional Relaying in Wireless Networks

The communication strategies for coded bidirectional (two–way) relaying emerge as a result of successful amalgamation of the recent ideas from network coding and the broadcast/interfering nature of the wireless communication medium. In this chapter we consider the basic scenario in which two terminal nodes carry out a two–way communication, helped by a third, relay node. Insights are provided into several important ideas that arise in this simple communication scenario. The communication mechanisms can be divided into two groups, depending whether the relay node is or is not required to decode the messages from the terminals. For the class of techniques in which the relay denoises rather than decodes the messages from the terminals, we discuss the role of structured codes in achieving the highest aggregate rates in the system. The treatment of the topics is generally in an information–theoretic setting, but we also present the design of communication mechanisms when finite–length packets and practical modulation constellations are used.

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