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

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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.


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Externa organisationer
  • Linköping University

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Kommunikationssystem


Sidor (från-till)2247-2261
TidskriftIEEE Transactions on Wireless Communications
Utgåva nummer4
Tidigt onlinedatum2018 jan 12
StatusPublished - 2018 apr
Peer review utfördJa