Non-linear Impairments Correction Precoder Configuration
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in addressing radio frequency (RF) link impairments due to high back-off requirements, leading to low power efficiency and sub-optimal performance in managing both linear and non-linear distortions across the entire channel.
Innovation Solution
An enhanced non-linear impairments correction precoder configuration that combines predistortion and beamforming, utilizing feedback from receiver devices to optimize the total channel capacity with reduced back-off, thereby improving Error Vector Magnitude (EVM) and capacity while maintaining the required Adjacent Channel Leakage Ratio (ACLR).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high back-off is used to maintain ACLR and signal quality, then signal quality and ACLR are improved, but power efficiency of the power amplifier deteriorates
Solution Approach 1:
The patent combines linear precoding and digital predistortion into a unified joint optimization framework that simultaneously addresses both linear channel exploitation and non-linear distortion correction, allowing the system to achieve better signal quality and ACLR performance without requiring high back-off, thus improving power efficiency
Solution Approach 2:
The patent changes the operational parameters by optimizing the back-off level through joint design of linear and non-linear processing, finding the optimal balance point that maintains signal quality and ACLR requirements while maximizing power amplifier efficiency
2Reliability
If independent digital blocks (linear precoder and digital predistorter) are used, then linear and non-linear distortions are addressed separately, but system complexity increases and performance is sub-optimal
Solution Approach 1:
The patent merges the linear precoder and digital predistorter into a joint optimization framework that handles both linear and non-linear distortions in a unified manner, reducing system complexity while achieving optimal performance by exploiting the total channel capacity rather than treating components independently
3Object-generated harmful factors
If high back-off is applied to maintain ACLR, then adjacent channel power leakage is reduced, but emission power and productivity decrease
Solution Approach 1:
The patent optimizes the back-off parameter through joint design, achieving the required ACLR performance with significantly lower back-off levels, thereby maintaining adjacent channel protection while maximizing emission power and system productivity
Solution Approach 2:
The patent recovers the power efficiency that would otherwise be lost to high back-off requirements by using joint optimization to achieve the same ACLR performance with lower back-off, effectively recovering the discarded power for productive use
Data Source
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AI summary
Systems and methods for providing wireless communication impairment correction using non-linear iterative precoding by a transmitter device are disclosed. The transmitter may exploit the non-linear transmit indications, and perform digital non-linear multiple input multiple output (MIMO) precoding of a transmit signal to improve the error vector magnitude (EVM) at the intended receiver device and/or reduce the adjacent channel leakage ratio (ACLR) at the unintended receiver devices. The non- linear transmit indications may comprise amplitude modulation to amplitude modulation (AM-AM) and amplitude modulation to phase modulation (AM-PM) indications. In operation, the non-linear transmit indications may be received from the intended receiver devices or may be measured by the transmitter device.