An Analysis of Two-Way Multi-Node Relay Systems

We consider a two-way relay system where two sources exchange information with the assistance of multiple, non-cooperative, relay nodes. Specifically, we propose a capacity upper bound for the two-way relay channel and derive the achievable regions for different relay strategies, such as the amplify-and-forward (AF), the decode-and-forward (DF) and the compress-and-forward (CF). Furthermore, the upper bound and the achievable regions for the additive white Gaussian noise channel are presented. Numerical results are provided to illustrate how the capacity varies with respect to the number of relay nodes, the distance between the relays and the sources, and the transmission powers.