Speaker | Klim Efremenko, University of Chicago |
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Date and Room | Wednesday, Feb 19th, 2pm / 4549 Boelter Hall |

Title | List and Unique Coding of Interactive Communication |

Abstract |
In this talk we extend the notion of list decoding to the setting of interactive communication and study its limits. In particular, we show that any protocol can be encoded, with a constant rate, into a list-decodable protocol which is resilient to a noise rate of up to 1/2-\varepsilon, and that this is tight. Using our list-decodable construction, we study a more nuanced model of noise where the adversary can corrupt up-to \alpha fraction of Alice's communication and up-to \beta fraction of Bob's communication. We will show how to use list-decoding in order to fully characterize the region R of pairs (\alpha, \beta) for which unique decoding with constant rate is possible. The region R_U turns out to be quite unusual in its shape. In particular, it is bounded by a piecewise-differentiable curve with infinitely many pieces. Joint work with Mark Braverman. |