Three-user MISO broadcast channel: How much can CSIT heterogeneity help?

Sina Lashgari, Ravi Tandon, Salman Avestimehr

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

4 Scopus citations


We study the impact of heterogeneity of channel state information available to the transmitters (CSIT) on the performance of multi-antenna multi-user wireless networks. More specifically, we consider the 3-user multiple-input single-output (MISO) broadcast channel, where the available CSIT with respect to each receiver can be instantaneous (P), delayed (D), or none (N); and we characterize the extent to which such heterogeneity of CSIT impacts its linear degrees of freedom (LDoF). In particular, we completely characterize the DoF region for all possible CSIT configurations, assuming linear encoding strategies at the transmitters. The converse, which is the main contribution of the paper, is based on a novel lemma, called Interference Decomposition Bound, which provides a lower bound on the interference dimension at a receiver with delayed CSIT, based on the dimension of constituents of that interference, thereby decomposing the interference into its individual components.

Original languageEnglish (US)
Title of host publication2015 IEEE International Conference on Communications, ICC 2015
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages6
ISBN (Electronic)9781467364324
StatePublished - Sep 9 2015
Externally publishedYes
EventIEEE International Conference on Communications, ICC 2015 - London, United Kingdom
Duration: Jun 8 2015Jun 12 2015

Publication series

NameIEEE International Conference on Communications
ISSN (Print)1550-3607


OtherIEEE International Conference on Communications, ICC 2015
Country/TerritoryUnited Kingdom

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering


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