Bounds on the Capacity of the Relay Channel with Noncausal State at the Source
The authors consider a three-terminal state-dependent relay channel with the channel state available non-causally at only the source. Such a model may be of interest for node cooperation in the framework of cognition, i.e., collaborative signal transmission involving cognitive and non-cognitive radios. They study the capacity of this communication model. One principal problem is caused by the relay's not knowing the channel state. For the Discrete Memoryless (DM) model, they establish two lower bounds and an upper bound on channel capacity. The first lower bound is obtained by a coding scheme in which the source describes the state of the channel to the relay and destination, which then exploit the gained description for a better communication of the source's information message.