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Joint UL and DL Spectral Efficiency Optimization of Superimposed Pilots in Massive MIMO
Linköping University, Department of Electrical Engineering, Communication Systems. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Electrical Engineering, Communication Systems. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-5954-434X
Dipartimento di Ingegneria dell’Informazione, University of Pisa, Pisa, Italy; Large Networks and System Group (LANEAS), CentraleSupélec, Université Paris-Saclay, Gif-sur-Yvette, France.
2017 (English)In: Proceedings of 2017 IEEE Globecom Workshops (GC Wkshps), IEEE, 2017, p. 1-7Conference paper, Published paper (Refereed)
Abstract [en]

The reuse of pilot sequences in a Massive MIMO system leads to pilot contamination, which reduces the channel estimation quality and adds coherent interference in the data transmission. A standard method to reduce pilot contamination, known as regular pilots (RPs), is to increase the pilot overhead and reuse pilots more sparsely in the network. Another approach, denoted as superimposed pilots (SPs), is to send a superposition of pilot and data symbols which allows the system to reuse pilots far more sparsely. This work performs a comparative analysis of RPs and SPs in Massive MIMO considering the joint spectral efficiency (SE) of the uplink (UL) and downlink (DL) communications. A rigorous DL lower bound on the capacity with SPs is derived and multiobjective optimization theory is used to compare the UL and DL SE between RPs and SPs. Numerical results indicate that RPs and SPs give comparable SE when both methods are optimized.

Place, publisher, year, edition, pages
IEEE, 2017. p. 1-7
Series
IEEE Globecom Workshops
Keywords [en]
MIMO communication, channel estimation, data communication, optimisation, DL spectral efficiency optimization, SP, channel estimation quality, data symbols, data transmission, joint spectral efficiency, massive MIMO system, pilot contamination, pilot overhead, pilot sequences, superimposed pilots, Antennas, Contamination, Interference, Optimization, Uplink
National Category
Telecommunications
Identifiers
URN: urn:nbn:se:liu:diva-145678DOI: 10.1109/GLOCOMW.2017.8269159ISI: 000426984700128ISBN: 9781538639207 (electronic)ISBN: 9781538639214 (print)OAI: oai:DiVA.org:liu-145678DiVA, id: diva2:1190582
Conference
4-8 Dec 2017 Globecom Workshops (GC Wkshps), Singapore, Singapore
Note

Funding agencies: Swedish Foundation for Strategic Research (SSF); ERC Starting MORE [305123]; Swedish Research Council; ELLIIT

Available from: 2018-03-15 Created: 2018-03-15 Last updated: 2019-06-28Bibliographically approved
In thesis
1. Analysis of Alternative Massive MIMO Designs: Superimposed Pilots and Mixed-ADCs
Open this publication in new window or tab >>Analysis of Alternative Massive MIMO Designs: Superimposed Pilots and Mixed-ADCs
2018 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The development of information and communication technologies (ICT) provides the means for reaching global connectivity that can help humanity progress and prosper. This comes with high demands on data traffic and number of connected devices which are rapidly growing and need to be met by technological development. Massive MIMO, where MIMO stands for multiple-input multiple-output, is envisioned as a fundamental component of next generation wireless communications for its ability to provide high spectral and energy efficiency, SE and EE, respectively. The key feature of this technology is the use of a large number of antennas at the base stations (BS) to spatially multiplex several user equipments (UEs).

In the development of new technologies like Massive MIMO, many design alternatives need to be evaluated and compared in order to find the best operating point with a preferable tradeoff between high performance and low cost. In this thesis, two alternative designs for signal processing and hardware in Massive MIMO are studied and compared with the baseline operation in terms of SE, EE, and power consumption. The first design is called superimposed pilot (SP) transmission and is based on superimposing pilot and data symbols to remove the overhead from pilot transmission and reduce pilot contamination. The second design is mixed analog-to-digital converters (ADCs) and it aims at balancing high performance and low complexity by allowing different ADC bit resolutions across the BS antennas.

The results show that the baseline operation of Massive MIMO, properly optimized, is the preferred choice. However, SP and mixed ADCs still have room for improvement and further study is needed to ascertain the full capabilities of these alternative designs.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2018. p. 62
Series
Linköping Studies in Science and Technology. Licentiate Thesis, ISSN 0280-7971 ; 1803
National Category
Telecommunications
Identifiers
urn:nbn:se:liu:diva-145677 (URN)10.3384/lic.diva-145677 (DOI)9789176853238 (ISBN)
Presentation
2018-04-13, Algoritmen, B-huset, ing 27/29, Campus Valla, Linköping, 13:15 (English)
Opponent
Supervisors
Note

Mindre typografiska fel är korrigerade i den elektroniska versionen. / Minor typographic errors are corrected in the electronic version.

Available from: 2018-03-15 Created: 2018-03-15 Last updated: 2019-06-28Bibliographically approved

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Verenzuela, DanielBjörnson, Emil

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