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Power Minimizer Symbol-Level Precoding: A Closed-Form Suboptimal Solution
University of Luxembourg.ORCID iD: 0000-0003-2298-6774
2018 (English)In: IEEE Signal Processing Letters, ISSN 1070-9908, E-ISSN 1558-2361, Vol. 25, no 11, p. 1730-1734Article in journal (Refereed) Published
Abstract [en]

In this letter, we study the optimal solution of multiuser symbol-level precoding (SLP) for minimization of the total transmit power under given signal-to-interference-plus-noise ratio constraints. Adopting the distance preserving constructive interference regions (DPCIR), we first derive a simplified reformulation of the problem. Then, we analyze the structure of the optimal solution using the Karush-Kuhn-Tucker optimality conditions. This leads us to obtain a closed-form suboptimal SLP solution (CF-SLP) for the original problem. Meanwhile, we obtain the necessary and sufficient condition under which the power minimizer SLP is equivalent to the conventional zero-forcing beamforming (ZFBF). Simulation results show that CF-SLP provides significant gains over ZFBF, while performing quite close to the optimal SLP in scenarios with rather small number of users. The results further indicate that the CF-SLP method has a reduction of order 103 in computational time compared to the optimal solution. © 2018 IEEE.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2018. Vol. 25, no 11, p. 1730-1734
Keywords [en]
Interference;Precoding;Optimization;Signal to noise ratio;Linear matrix inequalities;Minimization;Downlink;Constructive interference (CI);downlink multiuser MISO;power minimization;symbol-level precoding (SLP)
National Category
Signal Processing
Identifiers
URN: urn:nbn:se:kth:diva-258960DOI: 10.1109/LSP.2018.2870518ISI: 000446868000003Scopus ID: 2-s2.0-85053298299OAI: oai:DiVA.org:kth-258960DiVA, id: diva2:1350577
Note

QC 20191029

Available from: 2019-09-11 Created: 2019-09-11 Last updated: 2019-10-29Bibliographically approved

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CiteExportLink to record
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  • apa
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