Superimposed pilots: An alternative pilot structure to mitigate pilot contamination in massive MIMO

Karthik Upadhya, Sergiy A. Vorobyov, Mikko Vehkapera

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

15 Citations (Scopus)

Abstract

Superimposed pilots are proposed as an alternative to time-multiplexed pilot and data symbols for mitigating pilot contamination in massive multiple-input multiple-output systems. Provided that the uplink duration is larger than the total number of users in the system, superimposed pilots enable each user to be assigned a unique pilot sequence, thereby allowing for a significant reduction in pilot contamination. Channel estimation performance in the uplink is further improved using an iterative data-aided algorithm. Based on approximate expressions for the uplink signal-to-interference-plus-noise ratio, it is shown that superimposed pilots provide a better performance when compared with methods that use time-multiplexed data and pilots. Numerical simulations are used to validate the approximations and the improved performance of the proposed method.
Original languageEnglish
Title of host publication2016 IEEE International Conference on Acoustics, Speech and Signal Processing
Subtitle of host publicationICASSP 2016
PublisherIEEE Institute of Electrical and Electronic Engineers
Pages3366-3370
ISBN (Electronic)978-1-4799-9988-0, 978-1-4799-9987-3
DOIs
Publication statusPublished - 18 May 2016
MoE publication typeA4 Article in a conference publication
Event41st IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP 2016 - Shanghai, China
Duration: 20 Mar 201625 Mar 2016

Publication series

SeriesProceedings of the IEEE International Conference on Acoustics, Speech, and Signal Processing
Volume2016-May
ISSN1520-6149

Conference

Conference41st IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP 2016
CountryChina
CityShanghai
Period20/03/1625/03/16

Keywords

  • Massive MIMO
  • pilot decontamination
  • superimposed pilots

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    Upadhya, K., Vorobyov, S. A., & Vehkapera, M. (2016). Superimposed pilots: An alternative pilot structure to mitigate pilot contamination in massive MIMO. In 2016 IEEE International Conference on Acoustics, Speech and Signal Processing: ICASSP 2016 (pp. 3366-3370). [7472301] IEEE Institute of Electrical and Electronic Engineers. Proceedings of the IEEE International Conference on Acoustics, Speech, and Signal Processing, Vol.. 2016-May https://doi.org/10.1109/ICASSP.2016.7472301