Bi-directional use of spatial resources and effects of spatial correlation

Hyungsik Ju, Xiaohu Shang, H. Vincent Poor, Daesik Hong

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


In multiple antenna systems, spatial fading correlation causes a significant degradation in performance. In this work, a method for reducing the sensitivity to spatial fading correlation through the bi-directional use of spatial resources is investigated. Firstly, the concept of bi-directional use of spatial resources is introduced and the fading characteristics of the proposed bi-directional multiple-input multiple-output (B-MIMO) system are investigated. The achievable rates of the B-MIMO system are then investigated and compared with those of conventional MIMO systems for beamforming and full rank transmission. Based on those results, conditions needed for the B-MIMO system to demonstrate a larger average achievable rate are evaluated. B-MIMO systems are found to efficiently reduce the sensitivity to spatial fading correlation, while supporting comparable achievable rates in spatially white environments.

Original languageEnglish (US)
Article number5995303
Pages (from-to)3368-3379
Number of pages12
JournalIEEE Transactions on Wireless Communications
Issue number10
StatePublished - Oct 2011

All Science Journal Classification (ASJC) codes

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics


  • Multiple antennas
  • achievable rate
  • fading correlation
  • two-way communication


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