2x EHT-STF Sequence Configuration for PAPR Optimization
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Solution Overview
Problem
Current WLAN systems face challenges in efficiently utilizing increased spatial streams and bandwidth, particularly in next-generation wireless LAN systems like IEEE 802.11be, where improved signaling techniques are needed to optimize Peak to Average Power Ratio (PAPR) and ensure effective automatic gain control.
Innovation Solution
The proposal involves configuring a 2×EHT-STF sequence by repeating an STF sequence for a 40 MHz band in a WLAN system, specifically designed to optimize PAPR and support various Resource Units (RUs) or Multi-RUs defined in the 802.11be WLAN system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional STF sequence is used in broadband transmissions, then the system maintains backward compatibility with existing WLAN standards, but the PAPR performance deteriorates and automatic gain control becomes ineffective
Solution Approach 1:
The broadband STF sequence is segmented into multiple 40 MHz band STF sequences. Each segment is independently configured and then combined to form the complete broadband STF sequence, enabling optimized PAPR performance while maintaining compatibility with existing 40 MHz reception capabilities
Solution Approach 2:
The STF sequence parameters are changed by repeating the 40 MHz band STF sequence pattern across multiple frequency bands. This parameter modification optimizes the PAPR characteristics for broadband transmission while preserving the fundamental STF structure that ensures backward compatibility
2Use of energy by moving object
If the STF sequence is configured for optimized PAPR in broadband, then transmitting end performance improves, but compatibility with legacy receivers deteriorates
Solution Approach 1:
The STF sequence design achieves multi-functionality by being simultaneously optimized for broadband transmission with improved PAPR while maintaining compatibility with legacy 40 MHz receivers. The segmented structure allows different receiver types to properly process the signal according to their capabilities
3Productivity
If bandwidth is increased for higher data rates, then throughput improves, but signal estimation accuracy deteriorates due to subcarrier efficiency issues
Solution Approach 1:
The broadband signal is segmented into multiple 40 MHz bands, each with properly configured STF sequences. This segmentation enables receiving stations to accurately estimate subcarrier efficiency in each segment, preventing the degradation that would occur in a monolithic broadband signal
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 an STF signal. The STF signal is generated on the basis of a first STF sequence for the broadband. In a case where the broadband is a 320 MHz band, the first STF sequence is a sequence including an M sequence and is defined as {M −1 −M 0 M −1 M 0 M −1 −M 0 M −1 M 0 M −1 −M 0 M −1 M 0 M −1 −M 0 M −1 M 0 −M 1 M 0 −M 1 −M 0 M −1 −M 0 M −1 M 0 M −1 −M 0 M −1 M 0 −M 1 M 0 −M −M}*(1+j)/sqrt(2).