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An Efficient Manifold Algorithm for Constructive Interference based Constant Envelope Precoding

Liu, F; Masouros, C; Amadori, PV; Sun, H; (2017) An Efficient Manifold Algorithm for Constructive Interference based Constant Envelope Precoding. IEEE Signal Processing Letters , 24 (10) pp. 1542-1546. 10.1109/LSP.2017.2748230. Green open access

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Abstract

In this letter, we propose a novel manifold-based algorithm to solve the constant envelope (CE) precoding problem with interference exploitation. For a given power budget, we design the precoded symbols subject to the CE constraints, such that the constructive effect of the multiuser interference is maximized. While the objective function for the original problem is not complex differentiable, we consider the smooth approximation of its real representation, and map it onto a Riemannian manifold. By using the Riemmanian conjugate gradient algorithm, a local minimizer can be efficiently found. The complexity of the algorithm is analytically derived in terms of floating-points operations (flops) per iteration. Simulations show that the proposed algorithm outperforms the conventional methods on both symbol error rate and computational complexity.

Type: Article
Title: An Efficient Manifold Algorithm for Constructive Interference based Constant Envelope Precoding
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/LSP.2017.2748230
Publisher version: https://doi.org/10.1109/LSP.2017.2748230
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: Manifolds, Signal processing algorithms, Interference, Optimization, Approximation algorithms, Complexity theory, Precoding
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/10024851
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