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The authors consider a two-user state-dependent multi-access channel in which the states of the channel are known non-causally to one of the encoders and only strictly causally to the other encoder. Both encoders transmit a common message and, in addition, the encoder that knows the states non-causally transmits an individual message. They find explicit characterizations of the capacity region of this communication model in both discrete memoryless and memoryless Gaussian cases. In particular the capacity region analysis demonstrates the utility of the knowledge of the state's only strictly causally at the encoder that sends only the common message in general.
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