The capacity region of a multiple-access discrete memoryless channel can increase with feedback (Corresp.)

@article{Gaarder1975TheCR,
  title={The capacity region of a multiple-access discrete memoryless channel can increase with feedback (Corresp.)},
  author={N. Thomas Gaarder and Jack K. Wolf},
  journal={IEEE Trans. Information Theory},
  year={1975},
  volume={21},
  pages={100-102}
}
The capacity of a single-input single-output discrete memoryless channel is not increased by the use of a noiseless feedback link. It is shown, by example, that this is not the case for a multiple-access discrete memoryless channel. That is, it is shown that the capacity region for such a channel is enlarged if a noiseless feedback link is utilized. 

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