Achievable Rate Regions for the Two-way Relay Channel

Authors

Boris Rankov and Armin Wittneben

Reference

Proc. IEEE Int. Symposium on Information Theory (ISIT), Seattle, USA, July 2006.

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Abstract

We study the two-way communication problem for the relay channel. Hereby, two terminals communicate simultaneously in both directions with the help of one relay. We consider the restricted two-way problem, i.e., the encoders at both terminals do not cooperate. We provide achievable rate regions for different cooperation strategies, such as decode-and-forward based on block Markov superposition coding and compress-and-forward based on Wyner-Ziv source coding. We also evaluate the regions for the special case of additive white Gaussian noise channels. We show that a combined strategy of block Markov superposition coding and Wyner-Ziv coding achieves the cut-set upper bound on the sum-rate of the two-way relay channel when the relay is in the proximity of one of the terminals.

Keywords

Relay channel, two-way channel, rate regions, decode-and-forward, compress-and-forward, amplify-and-forward


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