Phase Rotation for L-SIG PAPR Reduction in 320 MHz WLAN
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Solution Overview
Problem
Existing WLAN systems face challenges in efficiently transmitting PPDU through broadband channels, particularly in scenarios with limited preamble puncturing, which affects the PAPR of L-SIG and thereby limits transmission range and overall performance.
Innovation Solution
The proposed method involves configuring a phase rotation value applied to the legacy preamble for optimized PAPR in L-SIG, specifically in consideration of limited preamble puncturing during broadband transmission in next-generation WLAN systems like IEEE 802.11be.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If broadband transmission is performed with limited preamble puncturing, then transmission range can be extended, but PAPR of L-SIG increases which limits transmission power
Solution Approach 1:
The patent applies phase rotation values to the legacy preamble fields (L-STF, L-LTF, L-SIG) to change the signal parameters and reduce PAPR. By multiplying the legacy preamble symbols by specific phase rotation values (e.g., [1, 1, 1, -j, j, j, j, 1, j, j, j, 1, -1, -1, -1, j]), the signal constellation is rotated in the complex plane, which redistributes the signal energy and reduces peak power while maintaining transmission range.
2Device complexity
If phase rotation is not applied to legacy preamble, then signal structure remains simple, but PAPR of L-SIG is high which reduces transmission efficiency
Solution Approach 1:
The patent introduces phase rotation values as a simple parameter modification to the legacy preamble. This approach maintains backward compatibility with existing WLAN standards while improving transmission efficiency. The phase rotation values are applied through simple complex multiplication operations, adding minimal computational complexity while significantly reducing PAPR and improving overall transmission efficiency in broadband systems.
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 PPDU includes a legacy preamble, and a first and a second signal field. The legacy preamble and the first and the second signal field are generated on the basis of a first phase rotation value. In a case in which the broadband is a 320 MHz band, the first phase rotation value is [1 1 1 −j j j j 1 j j j 1 −1 −1 −1 j].