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Joint Pilot Design and Uplink Power Allocation in Multi-Cell Massive MIMO Systems
Linköpings universitet, Institutionen för systemteknik, Kommunikationssystem. Linköpings universitet, Tekniska fakulteten.
Linköpings universitet, Institutionen för systemteknik, Kommunikationssystem. Linköpings universitet, Tekniska fakulteten. (Communication Systems Division)ORCID-id: 0000-0002-5954-434X
Linköpings universitet, Institutionen för systemteknik, Kommunikationssystem. Linköpings universitet, Tekniska fakulteten. (Communication Systems Division)ORCID-id: 0000-0002-7599-4367
2018 (engelsk)Inngår i: IEEE Transactions on Wireless Communications, ISSN 1536-1276, E-ISSN 1558-2248, Vol. 17, nr 3, s. 2000-2015Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

This paper considers pilot design to mitigate pilot contamination and provide good service for everyone in multi-cell Massive multiple input multiple output (MIMO) systems. Instead of modeling the pilot design as a combinatorial assignment problem, as in prior works, we express the pilot signals using a pilot basis and treat the associated power coefficients as continuous optimization variables. We compute a lower bound on the uplink capacity for Rayleigh fading channels with maximum ratio detection that applies with arbitrary pilot signals. We further formulate the max-min fairness problem under power budget constraints, with the pilot signals and data powers as optimization variables. Because this optimization problem is non-deterministic polynomial-time hard due to signomial constraints, we then propose an algorithm to obtain a local optimum with polynomial complexity. Our framework serves as a benchmark for pilot design in scenarios with either ideal or non-ideal hardware. Numerical results manifest that the proposed optimization algorithms are close to the optimal solution obtained by exhaustive search for different pilot assignments and the new pilot structure and optimization bring large gains over the state-of-the-art suboptimal pilot design.

sted, utgiver, år, opplag, sider
IEEE Communications Society, 2018. Vol. 17, nr 3, s. 2000-2015
Emneord [en]
Massive MIMO, Pilot Design, Signomial Programming, Geometric Programming, Hardware Impairments.
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-145713DOI: 10.1109/TWC.2017.2787702ISI: 000427226500042Scopus ID: 2-s2.0-85040035548OAI: oai:DiVA.org:liu-145713DiVA, id: diva2:1191346
Prosjekter
CENIIT
Forskningsfinansiär
ELLIIT - The Linköping‐Lund Initiative on IT and Mobile CommunicationsEU, Horizon 2020, 641985
Merknad

Funding agencies:This work was supported in part by the European Union's Horizon 2020 Research and Innovation Programme under Grant 641985 (5Gwireless), in part by ELLIIT, and in part by CENIIT. This paper was presented at the IEEE ICC 2017. The associate editor coordinating the review of this paper and approving it for publication was T. Lok.

Tilgjengelig fra: 2018-03-19 Laget: 2018-03-19 Sist oppdatert: 2019-06-28bibliografisk kontrollert

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Joint Pilot Design and Uplink Power Allocation in Multi-Cell Massive MIMO Systems(559 kB)114 nedlastinger
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