Robust uplink communications over fading channels with variable backhaul connectivity

Roy Karasik, Osvaldo Simeone, Shlomo Shamai

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Two mobile users communicate with a central decoder via two base stations. Communication between the mobile users and the base stations takes place over a Gaussian interference channel with constant channel gains or quasi-static fading. Instead, the base stations are connected to the central decoder through orthogonal finite-capacity links, whose connectivity is subject to random fluctuations. There is only receive-side channel state information, and hence the mobile users are unaware of the channel state and of the backhaul connectivity state, while the base stations know the fading coefficients but are uncertain about the backhaul links' state. The base stations are oblivious to the mobile users' codebooks and employ compress-and-forward to relay information to the central decoder. Upper and lower bounds are derived on average achievable throughput with respect to the prior distribution of the fading coefficients and of the backhaul links' states. The lower bounds are obtained by proposing strategies that combine the broadcast coding approach and layered distributed compression techniques. The upper bound is obtained by assuming that all the nodes know the channel state. Numerical results confirm the advantages of the proposed approach with respect to conventional non-robust strategies in both scenarios with and without fading.

Original languageEnglish (US)
Pages (from-to)5788-5799
Number of pages12
JournalIEEE Transactions on Wireless Communications
Volume12
Issue number11
DOIs
StatePublished - Nov 2013

All Science Journal Classification (ASJC) codes

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics

Keywords

  • Broadcast coding
  • Cloud radio access network
  • Distributed source coding
  • Fading
  • Limited backhaul
  • Multicell processing
  • Robust communication

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