Delay Optimal Secrecy in Two-Relay Network
Abstract
We consider a two-relay network in which a source aims to communicate a confidential message to a destination while keeping the message secret from the relay nodes. In the first hop, the channels from the source to the relays are assumed to be block-fading and the channel states change arbitrarily -possibly non-stationary and non-ergodic- across blocks. When the relay feedback on the states of the source-to-relay channels is available on the source with no delay, we provide an encoding strategy to achieve the optimal delay. We next consider the case in which there is one-block delayed relay feedback on the states of the source-to-relay channels. We show that for a set of channel state sequences, the optimal delay with one-block delayed feedback differs from the optimal delay with no-delayed feedback at most one block.
Cite
@article{arxiv.1410.4896,
title = {Delay Optimal Secrecy in Two-Relay Network},
author = {Y. Ozan Basciftci and C. Emre Koksal},
journal= {arXiv preprint arXiv:1410.4896},
year = {2014}
}