The Ergodic Fading Interference Channel With an On-and-Off Relay
The authors consider the Ergodic Fading Gaussian Interference Relay Channel (EF-GIFRC) with individual power constraints at the nodes. Aiming at design insights to emerge from the optimal power allocation, they focus on scenarios similar to that of the degraded/reversely degraded relay channels. In particular, they focus on models where the Source-to-Relay (S-R) links are either stronger than direct links, or completely blocked, i.e., with an "On-and-off" relay. To characterize the capacity of EF-GIFRC with an on-and-off relay, they first investigate the parallel interference relay channel. They propose an achievable scheme based on partial Decode-and-Forward (DF) strategy and show that the capacity for the parallel IFRC can be achieved under strong interference and degradedness conditions.