PAPR Reduction via Iterative Phase Rotation in Carrier Aggregation
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Solution Overview
Problem
In high-rate data transmission using carrier aggregation, the Peak to Average Power Ratio (PAPR) increases, leading to non-linear distortion and degradation of signal quality, particularly in power amplifiers, affecting Error Vector Magnitude (EVM) and Adjacent Channel Leakage Ratio (ACLR), necessitating effective PAPR suppression methods.
Innovation Solution
A method involving the selection of phase rotation factors for baseband signals of Component Carriers (CCs) to reduce PAPR, where phase rotations are iteratively applied until the PAPR is below a threshold or a maximum number of selections is reached, without distorting the signal, and compatible with existing predistortion technologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation with a large number of Component Carriers is used for high-rate data transmission, then data transmission rate is improved, but Peak to Average Power Ratio increases causing non-linear distortion and signal quality degradation
Solution Approach 1:
The patent applies preliminary action by performing PAPR reduction processing on the composite signal before transmission. The system predicts the PAPR of the carrier aggregation signal in advance, and when the predicted PAPR exceeds a threshold, it selectively maps alternative signal versions to reduce PAPR before the signal enters the power amplifier, preventing non-linear distortion from occurring
Solution Approach 2:
The patent introduces an intermediary mechanism by using a prediction model and selective mapping between the original carrier aggregation signal and alternative signal versions. This intermediary processing layer allows the system to choose optimal signal versions that maintain both high data transmission rates and acceptable PAPR levels, thereby preserving signal quality through multiple Component Carriers
2Productivity
If carrier aggregation with a large number of Component Carriers is used, then data transmission rate is improved, but non-linear distortion increases affecting Error Vector Magnitude and Adjacent Channel Leakage Ratio
Solution Approach 1:
The system performs preliminary PAPR prediction and reduction on the carrier aggregation signal before transmission. By predicting the PAPR in advance and selectively mapping alternative signal versions when needed, the system prevents non-linear distortion from occurring in the power amplifier, thereby reducing harmful effects on EVM and ACLR while maintaining high data transmission rates
Solution Approach 2:
The patent converts the potentially harmful high PAPR into a benefit by using it as a prediction criterion. When high PAPR is predicted, the system activates selective mapping to generate alternative signal versions with lower PAPR, thereby converting the harmful effect of high PAPR into a trigger for beneficial PAPR reduction processing that improves signal quality
Data Source
AI summary
A method for transmitting a signal, and an apparatus, a storage medium, and a user terminal are provided. The method includes: determining a plurality of baseband signals of Component Carriers (CC); selecting a plurality of phase rotation factors and recording a number of times of selection by adding one each time of selection; determining a candidate signal and a Peak to Average Power Ratio (PAPR) of the candidate signal, wherein in response to the PAPR being greater than or equal to a preset threshold and the number of times of selections not reaching a preset number of times, reselecting phase rotation factors and re-determining another candidate signal and a PAPR of the another candidate signal, until a PAPR is less than the preset threshold or the number of times of selections reaches the preset number of times; and transmitting the candidate signal.