Lattice Strategies for a Multi-Pair Bi-Directional Relay Network
The authors consider a cellular network inspired channel model which consists of the bi-directional exchange of information between a base-station and M terminal nodes with the help of a relay. The base-station has a message for each of M terminals, and conversely, each terminal node has a message for the base-station. A single relay assists the bi-directional communication endeavor. They assume an AWGN channel model with direct links (omitted in previous studies) between the base-station, relay, and half-duplex nodes. In this scenario, they derive achievable rate regions for two temporal protocols - needed in half-duplex networks - which indicate which users transmit when.