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

Flordelis, Jose LU ; Rusek, Fredrik LU ; Tufvesson, Fredrik LU ; Larsson, Erik G. and Edfors, Ove LU (2018) In IEEE Transactions on Wireless Communications
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,... (More)

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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Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
epub
subject
keywords
channel measurements, FDD, Massive MIMO, performance, TDD
in
IEEE Transactions on Wireless Communications
publisher
IEEE--Institute of Electrical and Electronics Engineers Inc.
external identifiers
  • scopus:85041185733
ISSN
1536-1276
DOI
language
English
LU publication?
yes
id
58cd02bd-dd1d-4b3f-bf92-fe276feb54be
date added to LUP
2018-02-12 11:44:58
date last changed
2018-06-10 05:26:56
@article{58cd02bd-dd1d-4b3f-bf92-fe276feb54be,
  abstract     = {<p>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.</p>},
  author       = {Flordelis, Jose and Rusek, Fredrik and Tufvesson, Fredrik and Larsson, Erik G. and Edfors, Ove},
  issn         = {1536-1276},
  keyword      = {channel measurements,FDD,Massive MIMO,performance,TDD},
  language     = {eng},
  month        = {01},
  publisher    = {IEEE--Institute of Electrical and Electronics Engineers Inc.},
  series       = {IEEE Transactions on Wireless Communications},
  title        = {Massive MIMO Performance - TDD Versus FDD : What Do Measurements Say?},
  url          = {http://dx.doi.org/},
  year         = {2018},
}