MO3.R8.2

Message-Cognizant Assistance and Feedback for the Gaussian Channel

Amos Lapidoth, Ligong Wang, Yiming Yan, ETH Zurich, Switzerland

Session:
Channels with Feedback

Track:
9: Shannon Theory

Location:
Omega

Presentation Time:
Mon, 8 Jul, 14:55 - 15:15

Session Chair:
Ram Zamir, Tel Aviv University
Abstract
A formula is derived for the capacity of the Gaussian channel with a benevolent message-cognizant rate-limited helper that provides a noncausal description of the noise to the encoder and the decoder. This capacity is strictly larger than when the helper is message oblivious. It is shown that, in this setup, a feedback link from the receiver to the encoder does not increase capacity. However, in the presence of such a link, said capacity can be achieved even if the helper is oblivious to the transmitted message.
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