Opportunistic cooperation and power control strategies for delay-limited capacity

In this paper, we study the delay-limited capacity of a cooperative relay network where the terminals are constrained by half-duplex assumption and average total network power. We show that, contrary to a single source-single destination case, where both terminals have only one antenna, a non-zero delaylimited capacity is achievable. Furthermore, we introduce simple transmission protocols which utilize the relay depending on the network channel state, and considerably improve the delay-limited capacity of the system compared to ‘always’ cooperate type protocols. This emphasizes the importance of feedback for cooperative systems that have delay sensitive applications.