On the capacity of the vector MAC with feedback

Syed Jafar, Andrea Goldsmith

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


In this correspondence, we determine the feedback capacity region of a two user Gaussian multiple-access channel (MAC) with multiple antennas at the base station and a single antenna at each user. The vector MAC with a single antenna at the base station and multiple antennas at each user is shown to be equivalent to a scalar MAC. We also determine the capacity enhancement due to feedback at high signal-to-noise ratio (SNR) for the scalar and vector MAC for any number of users. Extensions of the high SNR results to the vector broadcast channel are also provided.

Original languageEnglish (US)
Pages (from-to)3259-3264
Number of pages6
JournalIEEE Transactions on Information Theory
Issue number7
StatePublished - Jul 2006
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Information Systems
  • Computer Science Applications
  • Library and Information Sciences


  • Broadcast
  • Capacity
  • Feedback
  • Multiple access
  • Multiple antennas


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