Methods and apparatuses for estimating spatial domain distortion

The method addresses the challenges of estimating spatial domain distortion in massive-MIMO systems by selectively updating power amplifier models with reduced hardware, enabling efficient DPD adaptation and compliance testing in large antenna arrays.

WO2026124774A1 Publication Date: 2026-06-18TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Filing Date
2024-12-12
Publication Date
2026-06-18

AI Technical Summary

⚠Technical Problem

Existing methods for estimating spatial domain distortion in massive-MIMO systems with high numbers of antenna elements are challenged by the complexity, power consumption, and die area requirements of digital pre-distortion (DPD) in the digital front end, particularly due to the non-linearities of power amplifiers (PAs), and the impracticality of over-the-air (OTA) feedback or full-feedback schemes for large antenna arrays.

⚗Method used

A method and apparatus for estimating spatial domain distortion using a reduced hardware approach by selectively updating models of a subset of power amplifiers, utilizing time-sharing of feedback paths and inverse precoding to compute spatial domain distortion without requiring feedback from all PAs, enabling beam-domain DPD adaptation.

🎯Benefits of technology

Reduces hardware complexity and cost by estimating spatial domain distortion with fewer feedback paths, allowing effective DPD adaptation and compliance testing in large antenna arrays.

✦ Generated by Eureka AI based on patent content.

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Abstract

Embodiments described herein relate to a method and apparatus for estimating spatial domain distortion in one or more directions in beam formed signals output by a plurality of antenna elements, wherein the plurality of antennas are coupled to a respective plurality of power amplifiers in a respective plurality of transmit branches. A method comprises in a first time period performing a first process. The first process comprises: inputting first input signals, x, into the plurality of transmit branches; obtaining one or more first feedback signals, sfeedback, from a first subset of the plurality of power amplifiers, wherein the first subset comprises N power amplifiers, where N is an integer number; determining, utilizing the first input signals and the one or more first feedback signals, a first subset of models of the first subset of the plurality of power amplifiers; and estimating the spatial domain distortion utilizing the first subset of models and estimated models for those of the plurality of power amplifiers not in the first subset of power amplifiers.
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