A-PPDU Phase Rotation for Lower PAPR in WLAN Transmission
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Solution Overview
Problem
Existing WLAN systems face challenges in reducing peak-to-average power ratio (PAPR) and applying new phase rotations to aggregated-physical layer protocol data units (A-PPDUs, particularly in advanced communication environments like EHT and UHR.
Innovation Solution
A method and device for generating and transmitting A-PPDUs with phase rotations applied to specific fields, reducing PAPR by aggregating PPDUs and enabling efficient phase rotation application in WLAN systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple PPDUs are aggregated into A-PPDU for transmission, then transmission efficiency and bandwidth utilization are improved, but peak-to-average power ratio (PAPR) increases
Solution Approach 1:
The patent applies phase rotation to specific fields within the A-PPDU structure, changing the phase parameter of signal components to reduce PAPR while maintaining the aggregated transmission format. This involves modifying the phase characteristics of certain signal fields to achieve lower peak power ratios.
Solution Approach 2:
The patent applies different phase rotation strategies to different fields within the A-PPDU structure. Specifically, certain fields receive phase rotation treatment while others maintain original characteristics, allowing localized optimization of PAPR reduction without compromising overall transmission efficiency.
2Object-affected harmful factors
If phase rotation is applied to reduce PAPR in A-PPDU, then power ratio is reduced, but complexity of phase rotation application increases
Solution Approach 1:
The patent limits phase rotation application to specific fields within the A-PPDU structure rather than applying it uniformly across all fields. This selective approach reduces the overall complexity of phase rotation implementation while still achieving PAPR reduction benefits in the critical fields.
Solution Approach 2:
The patent divides the A-PPDU into multiple fields and applies phase rotation selectively to specific segments (fields) rather than the entire structure. This segmentation allows for simplified phase rotation processing in each field while maintaining overall system performance.
Data Source
AI summary
A method and an apparatus for transmitting or receiving an aggregated-physical layer protocol data unit (A-PPDU) in a wireless LAN system are disclosed. The method performed by a first station (STA) in a wireless LAN system, according to one embodiment of the present disclosure, may comprise the steps of: generating an A-PPDU, including a first PPDU and a second PPDU, on the basis that first phase rotation is applied to one or more fields of the first PPDU, second phase rotation is applied to one or more fields of the second PPDU, and third phase rotation is applied to one or more specific fields of the first PPDU and/or the second PPDU; and transmitting the A-PPDU to one or more second STAs.