On the energy-distortion tradeoff of Gaussian broadcast channels with feedback

Yonathan Murin, Yonatan Kaspi, Ron Dabora, Deniz Gündüz

Research output: Contribution to journalArticlepeer-review

Abstract

This work studies the relationship between the energy allocated for transmitting a pair of correlated Gaussian sources over a two-user Gaussian broadcast channel with noiseless channel output feedback (GBCF) and the resulting distortion at the receivers. Our goal is to characterize the minimum transmission energy required for broadcasting a pair of source samples, such that each source can be reconstructed at its respective receiver to within a target distortion, when the source-channel bandwidth ratio is not restricted. This minimum transmission energy is defined as the energy-distortion tradeoff (EDT). We derive a lower bound and three upper bounds on the optimal EDT. For the upper bounds, we analyze the EDT of three transmission schemes: two schemes are based on separate source-channel coding and apply encoding over multiple samples of source pairs, and the third scheme is a joint source-channel coding scheme that applies uncoded linear transmission on a single source-sample pair and is obtained by extending the Ozarow-Leung (OL) scheme. Numerical simulations show that the EDT of the OL-based scheme is close to that of the better of the two separation-based schemes, which makes the OL scheme attractive for energy-efficient, low-latency and low-complexity source transmission over GBCFs.

Original languageAmerican English
Article number243
JournalEntropy
Volume19
Issue number6
DOIs
StatePublished - 1 Jun 2017

Keywords

  • Correlated sources
  • Energy efficiency
  • Energy-distortion tradeoff
  • Gaussian broadcast channel with feedback
  • Joint source-channel coding

All Science Journal Classification (ASJC) codes

  • Information Systems
  • Electrical and Electronic Engineering
  • General Physics and Astronomy
  • Mathematical Physics
  • Physics and Astronomy (miscellaneous)

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