Sidelink Waveform Constellation Shift for PAPR Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in efficiently operating sidelink user equipment (UE) when slot aggregation is applied, particularly in managing peak-to-average power ratio (PAPR) and optimizing transmission power for reliable V2X communication.
Innovation Solution
A method and device for operating UE in a wireless communication system that generates waveforms for physical sidelink control channels, considering PAPR and constellation movement, to reduce PAPR and increase transmission power, while ensuring power constraints are met.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If slot aggregation is applied to sidelink UE, then transmission power can be increased to improve coverage, but peak-to-average power ratio (PAPR) increases causing amplifier saturation and signal distortion
Solution Approach 1:
The patent applies constellation shift to change the parameter of signal constellation points. By shifting the constellation points in the complex plane, the signal maintains higher average power for improved coverage while the peak power is controlled through the shift operation, thereby reducing PAPR and preventing amplifier saturation.
2Reliability
If constellation shift is applied to reduce PAPR, then transmission reliability improves, but transmission power is reduced which may limit coverage
Solution Approach 1:
The patent dynamically adjusts the constellation shift amount based on the actual transmission conditions. The shift amount is determined considering both PAPR reduction requirements and power transmission needs, allowing the system to adaptively balance between reliability and coverage in different operating scenarios.
3Productivity
If slot aggregation is used for V2X communication, then communication efficiency improves, but power management becomes more complex due to multiple signal components
Solution Approach 1:
The patent implements self-service power management where the sidelink UE autonomously determines the constellation shift amount and transmission parameters without requiring complex external control. The UE independently calculates optimal power settings by considering its own signal characteristics and transmission needs, simplifying the overall power management complexity while maintaining high communication efficiency.
Data Source
AI summary
According to an embodiment, an operation method of a terminal in a wireless communication system comprises the steps of: generating a first waveform from a signal related to a physical sidelink control channel (PSCCH) and generating a second waveform from a signal related to a physical sidelink shared channel (PSSCH); generating a third waveform on the basis of a peak to average power ratio (PAPR) and a constellation shift and transmitting the second waveform and the third waveform, wherein the constellation shift is applied only to the first waveform.