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Constructive Interference for Generic Constellations
University of Luxembourg.
2018 (English)In: IEEE Signal Processing Letters, ISSN 1070-9908, E-ISSN 1558-2361, Vol. 25, no 4, p. 586-590Article in journal (Refereed) Published
Abstract [en]

In this letter, we investigate optimal and relaxed constructive interference regions (CIR) for the symbol-level pre-coding (SLP) problem in the downlink of a multiuser multiple-input single-output (MISO) channel. We define two types of CIRs, namely, distance preserving CIR (DPCIR) and union bound CIR (UBCIR) for any given constellation shape and size. We then provide a systematic way to describe these regions as convex sets. Using the definitions of DPCIR and UBCIR, we show that the SLP power minimization problem, minimizing either sum or peak (perantenna) transmit power, can always be formulated as a convex optimization problem. Our results indicate that these regions allow further reduction of the transmit power compared to the current state of the art without increasing the computational complexity at the transmitter or receiver.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2018. Vol. 25, no 4, p. 586-590
Keywords [en]
Interference;MISO communication;Minimization;Optimization;Precoding;Signal to noise ratio;Transmitting antennas;Constructive interference (CI);Voronoi regions;multiuser multiple-input single-output (MISO);symbol-level precoding (SLP)
National Category
Signal Processing
Identifiers
URN: urn:nbn:se:kth:diva-258976DOI: 10.1109/LSP.2018.2808460ISI: 000428934400005Scopus ID: 2-s2.0-85042354994OAI: oai:DiVA.org:kth-258976DiVA, id: diva2:1350511
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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Citation style
  • apa
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  • de-DE
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  • nn-NB
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  • Other locale
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