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Multiplexing More Data Streams in the MU-MISO Downlink by Interference Exploitation Precoding

Li, A; Masouros, C; Liao, X; Li, Y; Vucetic, B; (2020) Multiplexing More Data Streams in the MU-MISO Downlink by Interference Exploitation Precoding. In: Proceedings of the 2020 IEEE Wireless Communications and Networking Conference (WCNC). IEEE: Seoul, South Korea. Green open access

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Abstract

In this paper, we focus on the constructive interference (CI) precoding for the scenario when the number of streams simultaneously transmitted by the base station (BS) is larger than that of transmit antennas at the BS, and derive the optimal precoding structure by employing the pseudo inverse. We show that the optimal pre-scaling vector in IE precoding is equal to a linear combination of the right singular vectors that correspond to zero singular values of the coefficient matrix. By formulating the dual problem, we further show that the optimal precoding matrix can be expressed as a function of the dual variables in a closed form, and an equivalent quadratic programming (QP) formulation is derived for computational complexity reduction. Numerical results validate our analysis and demonstrate significant performance improvements for interference exploitation precoding in the considered scenario.

Type: Proceedings paper
Title: Multiplexing More Data Streams in the MU-MISO Downlink by Interference Exploitation Precoding
Event: 2020 IEEE Wireless Communications and Networking Conference (WCNC)
Location: ELECTR NETWORK
Dates: 25 May 2020 - 28 May 2020
ISBN-13: 978-1-7281-3106-1
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/WCNC45663.2020.9120805
Publisher version: https://doi.org/10.1109/WCNC45663.2020.9120805
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: MIMO, symbol-level precoding, constructive interference, optimization, Lagrangian
UCL classification: UCL
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/10113976
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