Phase Rotation for PAPR Optimization in 320 MHz WLAN
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Solution Overview
Problem
Current wireless local area network (WLAN) systems face challenges in optimizing Peak to Average Power Ratio (PAPR) for wideband transmissions, particularly in next-generation standards like IEEE 802.11be, which require improved signaling techniques to effectively utilize increased spatial streams and bandwidth.
Innovation Solution
A method is proposed for configuring a phase rotation value specifically for a 160 MHz band to optimize PAPR in the Legacy-Short Training Field (L-STF) and Legacy-Long Training Field (L-LTF) of Physical Protocol Data Units (PPDUs) during wideband transmissions, applying this phase rotation value across 20 MHz bands to minimize PAPR and enhance subcarrier efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wideband transmission (320 MHz or 160+160 MHz) is implemented in next-generation WLAN systems, then bandwidth and throughput are improved, but PAPR optimization becomes difficult and subcarrier efficiency deteriorates
Solution Approach 1:
The 320 MHz wideband is segmented into multiple 20 MHz subbands, and a specific phase rotation value ([1 -1 -1 -1 -j j j j 1 -1 -1 -1 -j j j j]) is applied to each 20 MHz subband individually. This segmentation allows independent PAPR optimization for each subband while maintaining overall wideband transmission efficiency.
Solution Approach 2:
Different phase rotation values are applied to different 20 MHz subbands within the 320 MHz wideband based on their specific PAPR characteristics. This local quality approach ensures that each subband receives optimized phase rotation treatment tailored to its individual requirements, improving overall PAPR performance.
2Productivity
If increased number of spatial streams is used in next-generation WLAN, then data rate is improved, but signaling complexity increases
Solution Approach 1:
The phase rotation value is changed as a specific parameter to optimize PAPR for wideband transmissions. By modifying this parameter across different 20 MHz subbands, the system achieves improved PAPR performance without adding complex signaling mechanisms, thus supporting increased spatial streams efficiently.
3Adaptability or versatility
If 80 MHz-based preamble puncturing is performed in wideband, then flexibility is improved, but PAPR optimization becomes more challenging
Solution Approach 1:
The wideband is divided into multiple 20 MHz subbands, allowing selective activation or puncturing of specific subbands while applying appropriate phase rotation values to active subbands. This segmentation enables 80 MHz-based preamble puncturing flexibility while maintaining PAPR optimization in the active subbands.
Solution Approach 2:
Phase rotation optimization is applied locally to each 20 MHz subband independently, allowing the system to maintain optimal PAPR performance in active subbands even when other subbands are punctured. This local optimization approach accommodates bandwidth flexibility requirements.
Data Source
AI summary
Proposed are a method and a device for receiving a PPDU in a wireless LAN system. Specifically, a reception STA receives a PPDU from a transmission STA through a broadband and decodes the PPDU. The broadband is a 320 MHz band or a 160+160 MHz band. The PPDU includes a first field and a second field. The first field includes an L-LTF. The first field is generated on the basis of a first phase rotation value. The first phase rotation value is [1 −1 −1 −1 −j j j j 1 −1 −1 −1 −j j j j]. One element of the first phase rotation value is a phase rotation value applied to each 20 MHz band of the 320 MHz band or the 160+160 MHz band.