What is the value of limited feedback for MIMO channels?

David J. Love*, Robert W. Heath, Wiroonsak Santipach, Michael L. Honig

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

444 Scopus citations


Feedback in a communications system can enable the transmitter to exploit channel conditions and avoid interference. In the case of a multiple-input multiple-output channel, feedback can be used to specify a precoding matrix at the transmitter, which activates the strongest channel modes. In situations where the feedback is severely limited, important issues are how to quantize the information needed at the transmitter and how much improvement in associated performance can be obtained as a function of the amount of feedback available. We give an overview of some recent work in this area. Methods are presented for constructing a set of possible precoding matrices, from which a particular choice can be relayed to the transmitter. Performance results show that even a few bits of feedback can provide performance close to that with full channel knowledge at the transmitter.

Original languageEnglish (US)
Pages (from-to)54-59
Number of pages6
JournalIEEE Communications Magazine
Issue number10
StatePublished - Oct 2004

ASJC Scopus subject areas

  • Computer Science Applications
  • Computer Networks and Communications
  • Electrical and Electronic Engineering


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