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How Much Do Downlink Pilots Improve Cell-Free Massive MIMO?
Linköping University, Department of Electrical Engineering, Communication Systems. Linköping University, Faculty of Science & Engineering. Ericsson Research, Wireless Access Networks, S-58112 Linkoping, Sweden.
Linköping University, Department of Electrical Engineering, Communication Systems. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-7599-4367
Ericsson Research, Wireless Access Networks, S-58112 Linkoping, Sweden.
2016 (English)In: 2016 IEEE GLOBAL COMMUNICATIONS CONFERENCE (GLOBECOM), IEEE , 2016, 1-7 p.Conference paper (Refereed)
Abstract [en]

In this paper, we analyze the benefits of including downlink pilots in a cell-free massive MIMO system. We derive an approximate per-user achievable downlink rate for conjugate beamforming processing, which takes into account both uplink and downlink channel estimation errors, and power control. A performance comparison is carried out, in terms of per-user net throughput, considering cell-free massive MIMO operation with and without downlink training, for different network densities. We take also into account the performance improvement provided by max-min fairness power control in the downlink. Numerical results show that, exploiting downlink pilots, the performance can be considerably improved in low density networks over the conventional scheme where the users rely on statistical channel knowledge only. In high density networks, performance improvements are moderate.

Place, publisher, year, edition, pages
IEEE , 2016. 1-7 p.
Series
IEEE Global Communications Conference, ISSN 2334-0983
National Category
Telecommunications
Identifiers
URN: urn:nbn:se:liu:diva-138497DOI: 10.1109/GLOCOM.2016.7841875ISI: 000401963302068ISBN: 978-1-5090-1328-9 OAI: oai:DiVA.org:liu-138497DiVA: diva2:1111616
Conference
59th Annual IEEE Global Communications Conference (IEEE GLOBECOM)
Note

Funding Agencies|European Unions Horizon research and innovation programme [641985]

Available from: 2017-06-19 Created: 2017-06-19 Last updated: 2017-06-19

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
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  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
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  • en-US
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  • nn-NB
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  • Other locale
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Output format
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  • asciidoc
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