Blind interference alignment for private information retrieval

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Blind interference alignment for private information retrieval


Creation Date: Jul 10, 2016

Published In: Jul 2016

Paper Type: Conference Paper

Book Title: Proceedings of the 2016 IEEE International Symposium on Information Theory

Address: Barcelona, Spain


Blind interference alignment (BIA) refers to interference alignment schemes that are designed only based on channel coherence pattern knowledge at the transmitters (the “blind” transmitters do not know the exact channel values). Private information retrieval (PIR) refers to the problem where a user retrieves one out of K messages from N non-communicating databases (each holds all K messages) without revealing anything about the identity of the desired message index to any individual database. In this paper, we identify an intriguing connection between PIR and BIA. Inspired by this connection, we characterize the information theoretic optimal download cost of PIR, when we have K = 2 messages and the number of databases, N, is arbitrary.

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