Blind Interference Alignment for Private Information Retrieval
arXiv:1601.07885
Abstract
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.
Cited by in corpus (6)
- The Capacity of Robust Private Information Retrieval with Colluding Databases
- The Capacity of Private Information Retrieval
- The Capacity of Private Information Retrieval with Partially Known Private Side Information
- Multi-Message Private Information Retrieval: Capacity Results and Near-Optimal Schemes
- Fundamental Limits of Cache-Aided Private Information Retrieval with Unknown and Uncoded Prefetching
- Optimal Download Cost of Private Information Retrieval for Arbitrary Message Length