Power Amplifier Mode Signaling for Adaptive Reference Density
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing non-linear distortion in power amplifiers, which affect channel estimation performance and increase transmission overhead, particularly when non-linearity changes frequently.
Innovation Solution
A transmitting device determines a power amplifier operating mode based on the extent of non-linear distortion and configures an additional set of reference signals with adjustable resource density in the time or frequency domain to mitigate distortion, reducing overhead by dynamically adapting to the level of non-linearity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional reference signals are transmitted to mitigate non-linear distortion, then channel estimation performance is improved, but transmission overhead increases
Solution Approach 1:
The patent applies dynamics by making the resource density of additional reference signals adjustable based on the determined power amplifier operating mode. The system dynamically adapts the quantity and distribution of reference signals in time and frequency domains according to the actual non-linear distortion level, transmitting more reference signals when non-linearity is high and fewer when it is low, thereby resolving the contradiction between estimation accuracy and overhead.
Solution Approach 2:
The patent changes the parameter of resource density for additional reference signals based on the power amplifier operating mode. By adjusting the resource density parameter dynamically - increasing it when non-linear distortion is severe and decreasing it when distortion is minimal - the system optimizes the balance between channel estimation performance and transmission overhead.
2Reliability
If resource density of additional reference signals is increased to handle high non-linearity, then distortion mitigation is improved, but transmission efficiency decreases
Solution Approach 1:
The system dynamically adjusts the resource density of additional reference signals according to the determined power amplifier operating mode. When high non-linearity is detected, the system increases reference signal density to improve distortion mitigation; when non-linearity is low, it reduces density to maintain transmission efficiency, thus resolving the contradiction between reliability and productivity.
Solution Approach 2:
The patent changes the resource density parameter of additional reference signals based on the power amplifier operating mode determination. This parameter adaptation allows the system to optimize distortion mitigation performance while maintaining transmission efficiency by matching reference signal density to the actual non-linear distortion conditions.
3Device complexity
If fixed resource density is used for additional reference signals, then system complexity is reduced, but adaptability to varying non-linearity levels is worsened
Solution Approach 1:
The patent implements dynamics by making the resource density of additional reference signals adaptable to varying power amplifier operating modes. The system determines the operating mode based on non-linear distortion characteristics and adjusts reference signal density accordingly, providing adaptability to different non-linearity levels while maintaining manageable system complexity through mode-based classification.
Solution Approach 2:
The system changes the resource density parameter of additional reference signals based on the determined power amplifier operating mode. This parameter adaptation enables the system to adapt to varying non-linearity levels without requiring complex continuous adjustment mechanisms, achieving versatility through discrete mode-based parameter selection.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A transmitting device may determine a power amplifier operating mode associated with non-linear distortion of an input waveform for a power amplifier, where the power amplifier operating mode may be from a set of two or more power amplifier operating modes each associated with respective amounts of the non-linear distortion. The transmitting device may transmit a set of reference signals associated with estimation of a wireless channel for a transmission, and the transmitting device may further transmit an additional set of reference signals associated with non-linear distortion mitigation for the transmission. In some examples, a resource density of the additional set of reference signals may be based on the power amplifier operating mode. In some examples, the transmitting device may transmit an indication of the power amplifier operating mode, the resource density, or both, to a receiving device.