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Bidirectional Sum-Power Minimization Beamforming in Dynamic TDD MIMO Networks
Univ Fed Ceara, Ctr Technol, Dept Teleinformat Engn, Wireless Telecom Res Grp, BR-60020181 Fortaleza, Ceara, Brazil.;Fed Inst Educ Sci & Technol Ceara, BR-63660000 Taua, Brazil..
KTH, School of Electrical Engineering and Computer Science (EECS), Intelligent systems, Decision and Control Systems (Automatic Control). Ericsson Research, Kista, 164 40, Sweden.ORCID iD: 0000-0002-2289-3159
Univ Fed Ceara, Ctr Technol, Dept Teleinformat Engn, Wireless Telecom Res Grp, BR-60020181 Fortaleza, Ceara, Brazil..
Univ Fed Ceara, Ctr Technol, Dept Teleinformat Engn, Wireless Telecom Res Grp, BR-60020181 Fortaleza, Ceara, Brazil..ORCID iD: 0000-0002-0821-3460
2019 (English)In: IEEE Transactions on Vehicular Technology, ISSN 0018-9545, E-ISSN 1939-9359, Vol. 68, no 10, p. 9988-10002Article in journal (Refereed) Published
Abstract [en]

Employing dynamic time division duplexing can increase the system-wide spectral efficiency of applications with varying and unbalanced uplink and downlink data traffic requirements. However, in order to achieve this efficiency gain, it is necessary to manage the effects of cross-link interference, which are generated among cells transmitting in opposite link directions. This paper considers bidirectional sum-power minimization beamforming as a means to deal with this cross-link interference, by forcing a minimum signal-to-interference-plus-noise ratio constraint for both uplink and downlink. We propose two iterative approaches to solve this beamforming problem. The first approach assumes centralized processing and requires the availability of global channel state information. The second approach is performed in a decentralized manner, based on the alternating direction method of multipliers and requires only local channel state information and reduced signaling load. Both approaches are shown to converge to a minimum network power expenditure, whereas close-to-optimum performance can be obtained when limiting the number of iterations.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2019. Vol. 68, no 10, p. 9988-10002
Keywords [en]
Interference, Vehicle dynamics, Minimization, MIMO communication, Downlink, Dynamic scheduling, Optimization, Dynamic TDD, distributed beamforming, sum-power minimization
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-266181DOI: 10.1109/TVT.2019.2937474ISI: 000501349900052Scopus ID: 2-s2.0-85073870740OAI: oai:DiVA.org:kth-266181DiVA, id: diva2:1384535
Note

QC 20200110

Available from: 2020-01-10 Created: 2020-01-10 Last updated: 2020-01-10Bibliographically approved

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Fodor, Gabor

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