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Zero-Forcing MU-MIMO Precoding under Power Amplifier Non-Linearities

Alegría, Juan Vidal LU orcid ; Sheikhi, Ashkan LU orcid and Edfors, Ove LU orcid (2025) 59th Asilomar Conference on Signals, Systems and Computers, ACSSC 2025 p.604-608
Abstract

In multi-user multiple-input multiple-output (MU-MIMO) systems, the non-linear behavior of the power amplifiers (PAs) may cause degradation of the linear precoding schemes dealing with interference between user equipments (UEs), e.g., the zero-forcing (ZF) precoder. One way to minimize this effect is to use digital-pre-distortion (DPD) modules to linearize the PAs. However, using perfect DPD modules is costly and it may incur significant power consumption. As an alternative, we consider the problem of characterizing non-linearity-aware ZF (NLA-ZF) precoding schemes, hereby defined as linear precoders that achieve perfect interference cancellation in the presence of PA non-linearity by exploiting knowledge of this non-linear response. We... (More)

In multi-user multiple-input multiple-output (MU-MIMO) systems, the non-linear behavior of the power amplifiers (PAs) may cause degradation of the linear precoding schemes dealing with interference between user equipments (UEs), e.g., the zero-forcing (ZF) precoder. One way to minimize this effect is to use digital-pre-distortion (DPD) modules to linearize the PAs. However, using perfect DPD modules is costly and it may incur significant power consumption. As an alternative, we consider the problem of characterizing non-linearity-aware ZF (NLA-ZF) precoding schemes, hereby defined as linear precoders that achieve perfect interference cancellation in the presence of PA non-linearity by exploiting knowledge of this non-linear response. We provide initial iterative solutions that allow achieving NLA-ZF (up to adjustable tolerance) in a two-UE downlink MU-MIMO scenario where the base station (BS) has an even number of antennas, and each antenna is connected to a PA exhibiting third-order memory-less non-linear behavior. The proposed approach allows for performance gains in scenarios with significant residual interference.

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Please use this url to cite or link to this publication:
author
; and
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
MU-MIMO precoding, Non-linearity-aware zero-forcing (NLA-ZF), Power amplifier (PA) distortion
host publication
Conference Record of the 59th Asilomar Conference on Signals, Systems and Computers, ACSSC 2025
editor
Matthews, Michael B.
pages
5 pages
publisher
IEEE Computer Society
conference name
59th Asilomar Conference on Signals, Systems and Computers, ACSSC 2025
conference location
Pacific Grove, United States
conference dates
2025-10-26 - 2025-10-29
external identifiers
  • scopus:105035838036
ISBN
9798331587451
DOI
10.1109/IEEECONF67917.2025.11443522
language
English
LU publication?
yes
id
4c8e5420-b450-40c2-ad38-f5a5109785db
date added to LUP
2026-05-27 12:43:38
date last changed
2026-05-27 12:44:40
@inproceedings{4c8e5420-b450-40c2-ad38-f5a5109785db,
  abstract     = {{<p>In multi-user multiple-input multiple-output (MU-MIMO) systems, the non-linear behavior of the power amplifiers (PAs) may cause degradation of the linear precoding schemes dealing with interference between user equipments (UEs), e.g., the zero-forcing (ZF) precoder. One way to minimize this effect is to use digital-pre-distortion (DPD) modules to linearize the PAs. However, using perfect DPD modules is costly and it may incur significant power consumption. As an alternative, we consider the problem of characterizing non-linearity-aware ZF (NLA-ZF) precoding schemes, hereby defined as linear precoders that achieve perfect interference cancellation in the presence of PA non-linearity by exploiting knowledge of this non-linear response. We provide initial iterative solutions that allow achieving NLA-ZF (up to adjustable tolerance) in a two-UE downlink MU-MIMO scenario where the base station (BS) has an even number of antennas, and each antenna is connected to a PA exhibiting third-order memory-less non-linear behavior. The proposed approach allows for performance gains in scenarios with significant residual interference.</p>}},
  author       = {{Alegría, Juan Vidal and Sheikhi, Ashkan and Edfors, Ove}},
  booktitle    = {{Conference Record of the 59th Asilomar Conference on Signals, Systems and Computers, ACSSC 2025}},
  editor       = {{Matthews, Michael B.}},
  isbn         = {{9798331587451}},
  keywords     = {{MU-MIMO precoding; Non-linearity-aware zero-forcing (NLA-ZF); Power amplifier (PA) distortion}},
  language     = {{eng}},
  pages        = {{604--608}},
  publisher    = {{IEEE Computer Society}},
  title        = {{Zero-Forcing MU-MIMO Precoding under Power Amplifier Non-Linearities}},
  url          = {{http://dx.doi.org/10.1109/IEEECONF67917.2025.11443522}},
  doi          = {{10.1109/IEEECONF67917.2025.11443522}},
  year         = {{2025}},
}