Digital Post Distortion for Wireless Signal Quality
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Solution Overview
Problem
Wireless communication systems face challenges due to path loss, which can be measured as a decrease in signal-to-noise ratio (SNR), and increasing transmission power to compensate for this often introduces non-linear distortion, reducing error vector magnitude (EVM) performance.
Innovation Solution
A digital post distortion (DPoD) operation is performed at a receiving network node based on distortion information transmitted from a second network node, allowing for the removal of known non-linear distortion without the need for estimation, thereby improving signal quality and network performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission power is increased to compensate for path loss, then signal-to-noise ratio is improved, but non-linear distortion is introduced reducing error vector magnitude performance
Solution Approach 1:
The patent converts the harmful non-linear distortion introduced by high power transmission into a beneficial known characteristic by using distortion information to enable digital post distortion operations that remove the distortion effects, thereby achieving both high transmission power and high signal quality
Solution Approach 2:
The transmitting network node performs preliminary distortion information generation and transmission before the actual data transmission, allowing the receiving node to prepare the appropriate distortion removal operation in advance, ensuring distortion-free reception even when using high transmission power
2Power
If crest factor reduction is applied to increase transmission power, then power amplifier compression is avoided, but error vector magnitude performance is reduced due to introduced non-linear distortion
Solution Approach 1:
The patent transforms the harmful effect of crest factor reduction (introduced non-linear distortion) into a known characteristic that can be compensated for, allowing the system to maintain high transmission power while recovering the error vector magnitude performance through digital post distortion
Solution Approach 2:
The patent introduces distortion information as an intermediary element that carries the characteristics of the non-linear distortion, enabling the receiving node to apply the appropriate distortion removal operation without needing to directly analyze or estimate the distortion
3Manufacturing precision
If distortion estimation is performed to remove non-linear distortion, then signal quality can be improved, but computational overhead is incurred
Solution Approach 1:
The patent extracts the distortion characteristics from the complex signal processing task and represents them in a simplified form through distortion information, allowing distortion removal without the need for complex real-time distortion estimation algorithms
Solution Approach 2:
The patent uses distortion information as a simplified copy or representation of the actual non-linear distortion characteristics, enabling the receiving node to apply distortion removal operations based on this copy rather than performing complex estimation of the original distortion
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first network node may receive a distortion indication comprising distortion information associated with a signal transmission configuration corresponding to a second network node. The first network node may perform, based at least in part on the distortion information, a digital post distortion (DPoD) operation associated with a signal having a distortion characteristic corresponding to the distortion information. The first network node may communicate with the second network node based at least in part on performing the DPoD operation. Numerous other aspects are provided.