Massive MIMO Performance - TDD Versus FDD: What Do Measurements Say?

Research output: Contribution to journalArticlepeer-review

Abstract

Downlink beamforming in Massive MIMO either relies on uplink pilot measurements--exploiting reciprocity and time-division duplexing (TDD) operation, or on the use of a predetermined grid of beams with user equipments reporting their preferred beams, mostly in frequency-division duplexing (FDD) operation. Massive MIMO in its originally conceived form uses the first strategy, with uplink pilots, whereas there is currently significant commercial interest in the second, grid-of- beams. It has been analytically shown that with isotropic scattering (independent Rayleigh fading) the first approach outperforms the second. Nevertheless, there remains controversy regarding their relative performance in practical channels. In this contribution, the performances of these two strategies are compared using measured channel data at 2.6 GHz.

Original languageEnglish
Pages (from-to)2247-2261
JournalIEEE Transactions on Wireless Communications
Volume17
Issue number4
Early online date2018 Jan 12
DOIs
Publication statusPublished - 2018 Apr

Subject classification (UKÄ)

  • Communication Systems

Free keywords

  • channel measurements
  • FDD
  • Massive MIMO
  • performance
  • TDD

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