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

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Massive MIMO Performance - TDD Versus FDD : What Do Measurements Say? / Flordelis, Jose; Rusek, Fredrik; Tufvesson, Fredrik; Larsson, Erik G.; Edfors, Ove.

In: IEEE Transactions on Wireless Communications, Vol. 17, No. 4, 04.2018, p. 2247-2261.

Research output: Contribution to journalArticle

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TY - JOUR

T1 - Massive MIMO Performance - TDD Versus FDD

T2 - What Do Measurements Say?

AU - Flordelis, Jose

AU - Rusek, Fredrik

AU - Tufvesson, Fredrik

AU - Larsson, Erik G.

AU - Edfors, Ove

PY - 2018/4

Y1 - 2018/4

N2 - 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.

AB - 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.

KW - channel measurements

KW - FDD

KW - Massive MIMO

KW - performance

KW - TDD

U2 - 10.1109/TWC.2018.2790912

DO - 10.1109/TWC.2018.2790912

M3 - Article

AN - SCOPUS:85041185733

VL - 17

SP - 2247

EP - 2261

JO - IEEE Transactions on Wireless Communications

JF - IEEE Transactions on Wireless Communications

SN - 1536-1276

IS - 4

ER -