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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 study the capacity region of this communication model. In the discrete memoryless case, they establish inner and outer bounds on the capacity region. Although the encoder that sends both messages knows the states fully, they show that the strictly causal knowledge of these states at the other encoder can be beneficial for this encoder, and in general enlarges the capacity region.
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