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In this paper, communication over imperfectly-known fading channels withdifferent degrees of cooperation is studied. The three-node relay channel isconsidered. It is assumed that communication starts with the network trainingphase in which the receivers estimate the fading coefficients of theirrespective channels. In the data transmission phase, amplify-and-forward anddecode-and-forward relaying schemes are employed. For different cooperationprotocols, achievable rate expressions are obtained. These achievable rateexpressions are then used to find the optimal resource allocation strategies.In particular, the fraction of total time or bandwidth that needs to beallocated to the relay for best performance is identified. Under a total powerconstraint, optimal allocation of power between the source and relay isinvestigated. Finally, bit energy requirements in the low-power regime arestudied.

To Cooperate, or Not to Cooperate in Imperfectly-Known Fading Channels