Two-user erasure interference channels with local delayed CSIT

Journal Article (Journal Article)

We study the capacity region of two-user erasure interference channels with local delayed channel state information at the transmitters. In our model, transmitters have local mismatched outdated knowledge of the channel gains. We propose a transmission strategy that only relies on the delayed knowledge of the outgoing links at each transmitter and achieves the outer bound for the scenario in which transmitters learn the entire channel state with delay. Our result reveals the subset of the channel state information that affects the capacity region the most. We also identify cases in which local delayed knowledge of the channel state does not provide any gain over the zero knowledge assumption. To do so, we revisit a long-known intuition about interference channels that as long as the marginal distributions at the receivers are conserved, the capacity remains the same. We take this intuition and impose a certain spatial correlation among channel gains such that the marginal distributions remain unchanged. Then, we provide an outer bound on the capacity region of the channel with correlation that matches the capacity region when transmitters do not have access to channel state information.

Full Text

Duke Authors

Cited Authors

  • Vahid, A; Calderbank, R

Published Date

  • September 1, 2016

Published In

Volume / Issue

  • 62 / 9

Start / End Page

  • 4910 - 4923

International Standard Serial Number (ISSN)

  • 0018-9448

Digital Object Identifier (DOI)

  • 10.1109/TIT.2016.2594224

Citation Source

  • Scopus