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Correction to "Private Information Retrieval Over Gaussian MAC"

Or ElimelechOri ShmuelAsaf Cohen
Jan 2024
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摘要原文
In the above article \cite{shmuel2021private}, the authors introduced a PIR scheme for the Additive White Gaussian Noise (AWGN) Multiple Access Channel (MAC), both with and without fading. The authors utilized the additive nature of the channel and leveraged the linear properties and structure of lattice codes to retrieve the desired message without the servers acquiring any knowledge on the retrieved message's index. Theorems 3 and 4 in \cite{shmuel2021private} contain an error arising from the incorrect usage of the modulo operator. Moreover, the proofs assume a one-to-one mapping function, $\phi(\cdot)$, between a message $W_j\in\mathbb{F}_p^L$ and the elements of $\mathcal{C}$, mistakenly suggesting that the user possesses all the required information in advance. However, this is not the case. Herein, we present the corrected versions of these theorems.
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