EHT STF Sequence Design for 320 MHz WLAN Throughput
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Solution Overview
Problem
Current wireless LAN systems face challenges in efficiently utilizing increased spatial streams and bandwidth, particularly in next-generation EHT standards, due to limitations in signaling techniques and tone plans, which affect throughput and system performance.
Innovation Solution
The proposal involves a method and apparatus for receiving an EHT PPDU with an optimal STF sequence in a broadband tone plan, specifically designed for the EHT wireless LAN system, which includes a predefined M sequence repeated to achieve optimal PAPR, supporting bands like 320 MHz and 160+160 MHz, and enabling automatic gain control estimation in MIMO transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the existing tone plan and signaling techniques are used in EHT wireless LAN system, then backward compatibility with 802.11ax is maintained, but throughput and system performance are limited due to inability to efficiently utilize increased spatial streams and broadband
Solution Approach 1:
The patent changes the PAPR parameter of the STF sequence by repeating the M-sequence multiple times (2 times for 320 MHz, 4 times for 160+160 MHz) to achieve optimal PAPR values for broadband transmissions. This parameter optimization enables efficient utilization of increased spatial streams and broadband frequencies without requiring complex new signaling techniques, thus improving throughput while maintaining system simplicity
Solution Approach 2:
The patent creates a universal STF sequence design that works across multiple bandwidth configurations (320 MHz continuous, 160+160 MHz discontinuous) by adjusting the repetition count of the M-sequence. This multi-functional approach allows the same basic sequence structure to serve different broadband scenarios, improving throughput across various configurations without requiring separate complex signaling schemes for each case
2Productivity
If broadband tone plan with increased spatial streams is implemented, then throughput is improved, but system performance deteriorates due to suboptimal PAPR of STF sequence
Solution Approach 1:
The patent optimizes the PAPR parameter of the STF sequence by adjusting the repetition count of the M-sequence according to bandwidth configuration (2 times for 320 MHz, 4 times for 160+160 MHz). This parameter optimization ensures reliable automatic gain control estimation and system performance while enabling efficient utilization of increased spatial streams and broadband, thus achieving both high throughput and reliable system operation
3Measurement precision
If M-sequence repetition is increased for optimal PAPR in 320 MHz and 160+160 MHz bands, then automatic gain control estimation is improved, but sequence length and processing complexity increase
Solution Approach 1:
The patent changes the repetition count parameter of the M-sequence to achieve optimal PAPR for different bandwidth configurations. By setting specific repetition counts (2 times for 320 MHz, 4 times for 160+160 MHz), the patent improves automatic gain control estimation accuracy while keeping the sequence structure regular and predictable, thus minimizing processing complexity despite increased sequence length
4Productivity
If existing STF sequence design is used, then implementation simplicity is maintained, but throughput is limited due to non-optimal PAPR for broadband transmissions
Solution Approach 1:
The patent optimizes the PAPR parameter by adjusting the M-sequence repetition count according to bandwidth configuration. This parameter change improves throughput for broadband transmissions while maintaining implementation simplicity through the regular, predictable structure of repeated sequences and clear design rules, avoiding the need for complex new sequence designs
Data Source
AI summary
Proposed are a method and an apparatus for receiving an EHT PPDU in a wireless LAN system. Specifically, a reception STA receives an EHT PPDU including an STF signal from a transmission STA through a 320 MHz band or a 160+160 MHz band. The reception STA decodes the EHT PPDU. The STF signal is generated on the basis of an EHT STF sequence for the 320 MHz band or the 160+160 MHz band. The EHT STF sequence for the 320 MHz band is a first sequence in which a preconfigured M sequence is repeated, 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}*(1+j)/sqrt(2).