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Constant envelope precoding by interference exploitation in phase shift keying-modulated multiuser transmission

Amadori, PV; Masouros, C; (2017) Constant envelope precoding by interference exploitation in phase shift keying-modulated multiuser transmission. IEEE Transactions on Wireless Communications , 16 (1) pp. 538-550. 10.1109/TWC.2016.2626279. Green open access

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Abstract

We introduce a new approach to constant-envelope precoding (CEP) based on an interference-driven optimization region for generic phase-shift-keying modulations in the multi-user (MU) multiple-input-multiple-output downlink. While conventional precoding approaches aim to minimize the multi-user interference (MUI) with a total sum-power constraint at the transmitter, in the proposed scheme we consider MUI as a source of additional energy to increase the signal-to-interference-and-noise-ratio at the receiver. In our studies, we focus on two different CEP approaches: a first technique, where the power at each antenna is fixed to a specific value, and a two-step approach, where we first relax the power constraints to be lower than a defined parameter and then enforce CEP transmission. The algorithms are studied in terms of computational costs, with a detailed comparison between the proposed approach and the classical interference suppression schemes from the literature. Moreover, we analytically derive a robust optimization region to counteract the effects of channel-state estimation errors. The presented schemes are evaluated in terms of achievable symbol error rate in a perfect and imperfect channel-state information scenario for different modulation orders. Our results show that the proposed techniques further extend the benefits of classical CEP by judiciously relaxing the optimization region.

Type: Article
Title: Constant envelope precoding by interference exploitation in phase shift keying-modulated multiuser transmission
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/TWC.2016.2626279
Publisher version: http://dx.doi.org/10.1109/TWC.2016.2626279
Language: English
Additional information: This work is licensed under a Creative Commons Attribution 3.0 License. For more information, see http://creativecommons.org/licenses/by/3.0/
Keywords: massive MIMO, Constant-envelope, multiuser
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/1538820
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