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A Two-stage Vector Perturbation Scheme for Adaptive Modulation in Downlink MU-MIMO

Li, A; Masouros, C; (2015) A Two-stage Vector Perturbation Scheme for Adaptive Modulation in Downlink MU-MIMO. IEEE Transactions on Vehicular Technology p. 1. 10.1109/TVT.2015.2489263. (In press). Green open access

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Abstract

Conventional vector perturbation (VP) is not directly applicable to adaptive modulation while other existing algorithms are suboptimal due to the reduced search dimension of perturbation vectors. In this paper, by applying a simple transformation to the conventional VP operation, the search dimension for the proposed joint vector perturbation is made equal to that of conventional VP, and therefore the performance advantages of VP still hold in this scenario. Furthermore, to reduce the computational complexity, a joint constructive VP scheme is introduced by exploiting constructive interference to simplify the VP operation. By doing so, the sophisticated search for perturbation vectors is partially replaced by a quadratic programming problem, therefore saving significant computational complexity. Our analysis and results show that the proposed scheme offers an improved performance-complexity tradeoff compared to conventional VP approaches by means of the measurement in energy efficiency.

Type: Article
Title: A Two-stage Vector Perturbation Scheme for Adaptive Modulation in Downlink MU-MIMO
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/TVT.2015.2489263
Publisher version: http://dx.doi.org/10.1109/TVT.2015.2489263
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/
UCL classification: UCL
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/1496900
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