Multi-User Digital Post Distortion Correction for Downlink Nonlinearities
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing multi-user digital post distortion (DPoD) in downlink communications, leading to suboptimal spectral efficiency and increased power consumption due to non-linear noise and distortion caused by power amplification.
Innovation Solution
Implementing a method where user equipment (UE) receives indications of parameters associated with downlink communications from additional UEs, allowing it to apply digital post distortion correction based on measurements and these parameters, thereby improving signal estimation and correction for non-linearities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If digital post distortion correction is applied using only local UE measurements, then device complexity is reduced, but manufacturing precision of signal correction deteriorates due to inability to capture multi-user non-linearities
Solution Approach 1:
The patent merges measurements from multiple UEs by having each UE share its measured distortion parameters with other UEs. The combining UE integrates these measurements with its own local measurements to create a comprehensive distortion profile, thereby improving correction accuracy without significantly increasing individual UE complexity.
Solution Approach 2:
The patent introduces an intermediary mechanism where UEs exchange distortion measurement data through the network. This intermediary data sharing allows each UE to access multi-user distortion information without directly implementing complex multi-user measurement capabilities, resolving the contradiction between simplicity and accuracy.
2Productivity
If multi-user DPoD measurements are implemented, then spectral efficiency is improved through better signal correction, but device complexity increases due to additional measurement and coordination requirements
Solution Approach 1:
The patent implements preliminary action by having UEs perform distortion measurements during normal downlink reception before needing correction. The measured distortion parameters are stored and shared in advance, so when correction is needed, the UE already has the necessary multi-user distortion data, reducing real-time processing complexity while maintaining high spectral efficiency.
Solution Approach 2:
The patent applies partial action by implementing DPoD correction for only the most significant distortion components rather than attempting to correct all non-linearities. This selective approach improves spectral efficiency for the dominant distortion sources while limiting the increase in measurement and coordination complexity to manageable levels.
3Use of energy by moving object
If power amplification is increased to improve transmit power, then power usage efficiency is improved, but object-generated harmful factors increase due to non-linear noise and distortion
Solution Approach 1:
The patent converts the harmful non-linear distortion generated by power amplification into beneficial information by measuring and characterizing the distortion at the UE. This measured distortion data is then shared and used to correct the distortion in received signals, thereby allowing the system to operate at higher power amplification levels while maintaining signal quality through distortion compensation.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive one or more indications of parameters associated with one or more downlink communications transmitted to one or more additional UEs. The UE may receive a downlink communication, including applying digital post distortion (DPoD) correction based at least in part on measurements of the one or more downlink communications transmitted to the one or more additional UEs and the one or more indications of the parameters. Numerous other aspects are described.