2x EHT-STF Sequence Design for Wideband WLAN PAPR Optimization
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Solution Overview
Problem
Existing WLAN systems face challenges in efficiently using increased spatial streams and bandwidth, particularly in next-generation wireless LAN systems like IEEE 802.11be, where improved signaling techniques are needed to optimize performance.
Innovation Solution
The proposal involves configuring a 2×EHT-STF sequence for broadband transmission in WLAN systems, specifically designed for the IEEE 802.11be standard. This sequence is optimized for various Resource Units (RUs) or Multi-RUs (MRUs), ensuring efficient subcarrier usage and effective automatic gain control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional STF sequence is used in wideband transmission, then the system maintains backward compatibility with existing standards, but the PAPR performance deteriorates and subcarrier efficiency is reduced
Solution Approach 1:
The patent modifies the STF sequence parameters by using a 2x repetition structure and optimizing the sequence for wideband conditions. This changes the fundamental parameters of the training sequence to achieve better PAPR performance while maintaining the basic STF function, allowing the system to adapt to wideband transmission requirements without completely abandoning the standard structure
2Productivity
If the bandwidth is increased for higher data rates, then the productivity improves, but the difficulty of detecting and measuring signal parameters increases
Solution Approach 1:
The patent segments the wideband signal into multiple RUs (Resource Units) and applies different STF sequence configurations to each RU. This segmentation approach allows the system to handle wideband transmission by breaking it down into manageable frequency segments, each with optimized STF sequences, making detection and measurement more feasible while maintaining high data rates
3Quantity of substance
If the number of spatial streams is increased to enhance capacity, then the quantity of information transmitted improves, but the device complexity increases
Solution Approach 1:
The patent creates a universal STF sequence structure that can be applied across multiple spatial streams and RU configurations. The 2x repeated STF sequence design provides a multi-functional solution that works for different numbers of spatial streams and bandwidth configurations, reducing the need for separate complex signaling mechanisms for each configuration
Data Source
AI summary
Proposed are a method and device for receiving a PPDU in a wireless LAN system. Specifically, a reception STA receives the PPDU from a transmission STA through a wideband 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 wideband. When the wideband is a 320 MHz band, the first STF sequence is a sequence including a M sequence and is defined as {M −1 M −1 −M −1 M 0 −M 1 M 1 −M 1 −M 0 M −1 M −1 −M −1 M 0 −M 1 M 1 −M 1 −M 0 −M 1 −M 1 M 1 −M 0 M −1 −M −1 M −1 M 0 −M 1 −M 1 M 1 −M 0 M −1 −M −1 M −1 M}*(1+j)/sqrt(2).