320 MHz LTF Sequence Layout for Accurate EHT PPDU Transmission

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing wireless local area network (WLAN) systems face challenges in efficiently utilizing a 320 MHz band for communication, particularly in the context of the emerging extreme high throughput (EHT) standard, which requires improved LTF sequences for enhanced performance.

Innovation Solution

The proposed solution involves defining a specific LTF sequence for the 320 MHz band, comprising sequences for 1st to 11th sequences, each with unique phase and amplitude patterns, to facilitate effective transmission and reception of PPDU signals.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If existing LTF sequences are used for 320 MHz band transmission, then device compatibility is maintained, but transmission efficiency and signal accuracy deteriorate

Engineering Contradiction:

Improvetransmission efficiencyVSAvoidsignal accuracy

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent modifies the LTF sequence parameters specifically for 320 MHz band transmission by defining new sequences (1st through 11th sequences) with optimized phase and amplitude patterns. These parameter changes enable the system to achieve both improved transmission efficiency and maintained signal accuracy in the wider bandwidth environment

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The LTF sequence is divided into multiple segments (1st sequence through 11th sequence) that can be independently optimized and combined. This segmentation allows each portion to be tailored for specific subcarrier ranges within the 320 MHz band, improving overall transmission performance while maintaining compatibility through structured composition

Inventive Principle:

Principle #1Segmentation

2Quantity of substance

If bandwidth is increased to 320 MHz, then data transmission capacity is improved, but sequence design complexity increases

Engineering Contradiction:

Improvedata transmission capacityVSAvoidsequence design complexity

Core Design Contradiction:

Quantity of substanceVSDevice complexity

Solution Approach 1:

The defined LTF sequences serve multiple functions: they enable channel estimation, support synchronization, and facilitate signal detection across the entire 320 MHz bandwidth. The same sequence structure can be applied regardless of the specific subcarrier allocation, providing universal applicability that reduces design complexity despite the increased bandwidth

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12512881B22X LTF sequence for 320 MHz

Publication Date: 2025.12.30 LG ELECTRONICS INC

AI summary

A physical protocol data unit (PPDU) to be used for 320 MHz transmission in a wireless local area network system, and the long training field (LTF) of the PPDU is defined through an LTF sequence. The LTF sequence relates to a 2x LTF sequence and is defined as follows: {first sequence, zero sequence, second sequence, zero sequence, third sequence, zero sequence, forth sequence}.