A general outer bound for MISO broadcast channel with heterogeneous CSIT

Sina Lashgari, Ravi Tandon, A. Salman Avestimehr

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

We study the impact of heterogeneity of channel-state-information available at the transmitters (CSIT) on the capacity of broadcast channels with a multiple-antenna transmitter and k single-antenna receivers (MISO BC). In particular, we consider the k-user MISO BC, where the CSIT with respect to each receiver can be either instantaneous/perfect (P), delayed (D), or not available (N); and we study the impact of this heterogeneity of CSIT on the degrees-of-freedom (DoF) of such network. We develop a general outer bound on the DoF region of k-user MISO BC for all possible heterogeneous CSIT configurations, assuming linear encoding strategies at the transmitter. The outer bound leads to an approximate linear sum-DoF characterization to within 0.5 for a broad range of CSIT configurations. It also leads to an exact characterization of linear sum-DoF for some specific CSIT configurations. Our proof of the outer bound relies on the development of a novel lemma, called Interference Decomposition Bound, which lower bounds the interference dimension at a receiver which supplies delayed CSIT based on the average dimension of constituents of that interference, thereby decomposing it into its components.

Original languageEnglish (US)
Title of host publicationProceedings - 2015 IEEE International Symposium on Information Theory, ISIT 2015
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages401-405
Number of pages5
ISBN (Electronic)9781467377041
DOIs
StatePublished - Sep 28 2015
Externally publishedYes
EventIEEE International Symposium on Information Theory, ISIT 2015 - Hong Kong, Hong Kong
Duration: Jun 14 2015Jun 19 2015

Publication series

NameIEEE International Symposium on Information Theory - Proceedings
Volume2015-June
ISSN (Print)2157-8095

Other

OtherIEEE International Symposium on Information Theory, ISIT 2015
Country/TerritoryHong Kong
CityHong Kong
Period6/14/156/19/15

ASJC Scopus subject areas

  • Theoretical Computer Science
  • Information Systems
  • Modeling and Simulation
  • Applied Mathematics

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