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- W3202006029 abstract "The fundamental limits of private information retrieval (PIR) with unknown cache prefetching at the user are investigated in this paper. To this end, a novel random linear combination (RLC)-based PIR scheme that can solve the basic PIR problem and its variation is proposed. The proposed scheme is based on random coding approach and achieves the capacity of the basic PIR asymptotically. Then, we investigate PIR with unknown cache prefetching (PIRC) problem at different cache-to-file size ratio. Specifically, we propose RLC-based PIRC method, which prefetches RLC-based side information and leverages them to retrieve desired information at small download cost. Furthermore, by applying time and memory sharing on the proposed RLC-based PIRC, RLC-based basic PIR and some other known approach in literature, we derive the achievable normalized download cost bound of PIRC. The derived achievable bound outperforms the existing bound in literature and the case study provides numerical results that verifies it." @default.
- W3202006029 created "2021-10-11" @default.
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- W3202006029 date "2021-12-01" @default.
- W3202006029 modified "2023-10-09" @default.
- W3202006029 title "Fundamental Limits of Private Information Retrieval With Unknown Cache Prefetching" @default.
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- W3202006029 doi "https://doi.org/10.1109/tcomm.2021.3117936" @default.
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