Impact of Line-of-Sight and Unequal Spatial Correlation on Uplink MU-MIMO Systems

Harsh Tataria, Peter J Smith, Larry J. Greenstein, Pawel A Dmochowski, Michail Matthaiou

Research output: Contribution to journalArticlepeer-review


Closed-form approximations of the expected per-terminal signal-to-interference-plus-noise-ratio (SINR) and ergodic sum spectral efficiency of a multiuser multiple-input multiple-output system are presented. Our analysis assumes spatially correlated Ricean fading channels with maximum-ratio combining on the uplink. Unlike previous studies, our model accounts for the presence of unequal correlation matrices, unequal Rice factors, as well as unequal link gains to each terminal. The derived approximations lend themselves to useful insights, special cases and show the combined impact of line-of-sight (LoS) and correlated components. Numerical results show that while unequal correlation matrices enhance the system performance, the presence of strong LoS has an opposite effect. The approximations are general and remain insensitive to changes in the system dimensions, signal-to-noise-ratios, LoS levels, and correlation levels.
Original languageEnglish
Article number7976368
Pages (from-to)634-637
Number of pages4
JournalIEEE Wireless Communications Letters
Issue number5
Publication statusPublished - 2017 Oct 1
Externally publishedYes

Subject classification (UKÄ)

  • Communication Systems

Free keywords

  • Unequal spatial correlation
  • Line-of-sight
  • Ricean fading
  • Maximum-ratio combining
  • Ergodic spectral efficiency
  • Massive MIMO
  • Statistical analysis


Dive into the research topics of 'Impact of Line-of-Sight and Unequal Spatial Correlation on Uplink MU-MIMO Systems'. Together they form a unique fingerprint.

Cite this