An iterative decision directed channel estimation for multi-user MIMO systems

Guilherme Gaspar, Afonso Ferreira, Paulo Montezuma, Mario Marques Da Silva, Rui Dinis

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The massive use of transmit and receive antennas with perfect channel state information (CSI) in massive MIMO systems (Multiple Input Multiple Output) can lead array power gain increments proportional to the number of antennas. For CSI estimation pilots can be used, but in multi-user scenarios pilot contamination may occur which may compromise estimation, even when are used orthogonal sequences such as Chu sequences. In such conditions even a precoding does not cancel interference among users and the system performance can be compromised. It is shown that a decision directed scheme based on a iterative block frequency domain equalizer can be used to compensate the pilot contamination impact on channel estimation without sacrificing the complexity. Moreover, when the coherence time spans multiple data blocks, these most accurate channel estimates can be used to precod the subsequent blocks and thereby improve system performance. It is also presented a set of performance results that sustain our assumption.

Original languageEnglish
Title of host publication2017 Progress in Electromagnetics Research Symposium - Spring, PIERS 2017
PublisherElectromagnetics Academy
Pages3699-3706
Number of pages8
VolumePart F134321
ISBN (Electronic)9781509062690
DOIs
Publication statusPublished - 22 May 2017
Event2017 Progress In Electromagnetics Research Symposium - Spring, PIERS 2017 - St. Petersburg, Russian Federation
Duration: 22 May 201725 May 2017

Conference

Conference2017 Progress In Electromagnetics Research Symposium - Spring, PIERS 2017
CountryRussian Federation
CitySt. Petersburg
Period22/05/1725/05/17

Keywords

  • BLOCK DIAGONALIZATION
  • EQUALIZATION
  • SELECTION

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  • Cite this

    Gaspar, G., Ferreira, A., Montezuma, P., Da Silva, M. M., & Dinis, R. (2017). An iterative decision directed channel estimation for multi-user MIMO systems. In 2017 Progress in Electromagnetics Research Symposium - Spring, PIERS 2017 (Vol. Part F134321, pp. 3699-3706). Electromagnetics Academy. https://doi.org/10.1109/PIERS.2017.8262401