Amplitude Tracking Reference Signal for Nonlinearity Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing communication systems face challenges in efficiently compensating for nonlinearity distortions caused by power amplifiers, which vary due to environmental factors and hardware operating conditions, leading to performance degradation.
Innovation Solution
The proposed solution involves a reference signal design, specifically an Amplitude Tracking Reference Signal (ATRS), to identify the nonlinearity profile. This signal is used to configure receiver settings for compensation and to report the profile back to the transmitter, allowing for adaptive configuration to mitigate nonlinearity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If power amplifiers operate in highly nonlinear mode to reduce energy consumption, then energy efficiency is improved, but nonlinearity distortion increases causing performance degradation
Solution Approach 1:
The system performs preliminary identification of the nonlinearity profile using reference signals before data transmission. This allows the receiver to prepare compensation mechanisms in advance, enabling the power amplifier to operate in highly nonlinear mode while the distortion is pre-characterized and can be compensated for during reception.
Solution Approach 2:
The system implements feedback by identifying the nonlinearity profile at the receiver and reporting it back to the transmitter. This feedback loop allows the transmitter to adjust its operation based on the actual nonlinearity characteristics, enabling energy-efficient nonlinear operation while maintaining signal quality through informed compensation.
2Object-generated harmful factors
If digital pre-distortion is implemented to compensate for nonlinearity, then distortion is reduced, but device complexity increases
Solution Approach 1:
The receiver performs self-service by autonomously identifying the nonlinearity profile using transmitted reference signals and reporting it back to the transmitter. This eliminates the need for complex transmitter-side pre-distortion hardware, as the receiver takes responsibility for characterizing and compensating for the nonlinearity, thereby reducing overall device complexity.
3Measurement precision
If nonlinearity profile identification is performed continuously to track environmental variations, then compensation accuracy is improved, but loss of time and processing overhead increase
Solution Approach 1:
The system uses periodic reference signals transmitted at regular intervals to identify the nonlinearity profile. This periodic approach allows the system to track environmental variations and hardware drift over time while maintaining reasonable processing overhead, as identification is performed only when needed rather than continuously during data transmission.
Data Source
AI summary
In one aspect, a method performed by a transmitter in a first device for signaling a nonlinearity profile of distortion of transmissions in a communications network is provided. The method includes generating an amplitude tracking reference signal (ATRS), wherein the ATRS comprises information indicating a nonlinearity profile of distortions of transmissions by the transmitter, and transmitting the generated ATRS towards a second device. In another aspect, a method performed by a receiver in a second device for identifying a nonlinearity profile of distortion of transmissions in a communications network by a transmitter in a first device is provided. The method includes receiving an ATRS from the first device, wherein the ATRS comprises information indicating a nonlinearity profile of distortions of transmissions by the transmitter and identifying the nonlinearity profile of distortion of transmissions by the transmitter based on the ATRS.