Power Amplifier Non-Linearity Signaling for DPD and DPoD

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Solution Overview

Problem

Existing wireless communication systems face challenges in effectively managing non-linearity in power amplifier circuitry, leading to signal distortion, which is not adequately addressed by current techniques for signaling and compensation.

Innovation Solution

Implementing digital pre-distortion (DPD) and digital post-distortion (DPoD) techniques to compensate for changes in the non-linearity model of power amplifier circuitry, with wireless communication devices exchanging information about these changes to update their models and compensate for distortion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If digital pre-distortion and post-distortion techniques are implemented to compensate for non-linearity changes, then signal quality is improved, but device complexity increases

Engineering Contradiction:

Improvesignal qualityVSAvoiddevice complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The transmitting device performs digital pre-distortion as a preliminary action before signal transmission to compensate for anticipated non-linear distortions. The device determines changes in the non-linearity model and applies corresponding pre-distortion adjustments, preparing the signal in advance to counteract expected distortions from power amplifier non-linearity variations.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system implements feedback through the exchange of non-linearity model change information between transmitting and receiving devices. The receiving device detects non-linearity changes and communicates this information back to the transmitting device, which then adjusts its pre-distortion parameters accordingly, creating a closed-loop system that continuously optimizes signal quality.

Inventive Principle:

Principle #23Feedback

2Measurement precision

If non-linearity model information is exchanged between devices, then compensation accuracy is improved, but loss of time increases

Engineering Contradiction:

Improvecompensation accuracyVSAvoidtime delay

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

Instead of exchanging complete non-linearity model datasets, the system transmits only the essential change indicators or differential updates. This partial action approach provides sufficient information for the receiving device to update its compensation parameters without the overhead of transmitting full model information, thereby reducing time delay while maintaining compensation accuracy.

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The receiving device creates and maintains a local copy of the non-linearity model information, updating it based on exchanged change indicators. This copying mechanism allows the receiving device to have immediate access to compensation parameters without requiring continuous real-time data exchange, reducing communication time while maintaining accurate compensation.

Inventive Principle:

Principle #26Copying

Data Source

PatentUS12556440B2Signaling of information for non-linearity model

Publication Date: 2026.02.17 QUALCOMM INC

AI summary

Aspects relate to signaling relating to a non-linearity model for power amplifier circuitry of a transmitting device. The power amplifier circuitry may apply digital pre-distortion (DPD) to a signal prior to amplification and transmission of the signal. A receiving device may apply digital post-distortion (DPoD) to a signal received from the transmitting device where the DPoD is based on the non-linearity model. The transmitting device may send to the receiving device non-linearity parameters for the non-linearity model.