4X LTF Sequence Design for 320 MHz WLAN Bandwidth
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Solution Overview
Problem
Current wireless local area network (WLAN) systems face challenges in efficiently transmitting data over a 320 MHz band, particularly in achieving high throughput and reliable communication.
Innovation Solution
The introduction of a new 4×LTF sequence specifically designed for the 320 MHz band, which is part of a physical protocol data unit (PPDU) in a WLAN system, enhances the transmission efficiency by optimizing the long training field (LTF) signal structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a new 4×LTF sequence is designed for 320 MHz band, then data transmission rate and reliability are improved, but sequence complexity and design difficulty increase
Solution Approach 1:
The 4×LTF sequence for 320 MHz band is segmented into multiple 80 MHz sub-sequences (LTF80 MHz_left and LTF80 MHz_right) that are reused and combined. This segmentation allows the complex 320 MHz sequence to be constructed from simpler, proven 80 MHz components, reducing design difficulty while maintaining high transmission rates.
Solution Approach 2:
The patent implements a nested structure where 80 MHz LTF sequences are nested within the 320 MHz 4×LTF sequence. The 320 MHz sequence contains multiple instances of 80 MHz sequences arranged in a hierarchical pattern, allowing efficient reuse of existing sequence designs while achieving the required 320 MHz bandwidth performance.
2Productivity
If bandwidth is increased to 320 MHz, then throughput is improved, but signal transmission stability deteriorates
Solution Approach 1:
The 320 MHz bandwidth is segmented into multiple 80 MHz sub-bands, each with its own LTF sequence. This segmentation allows the system to maintain stable signal transmission within each narrower sub-band while achieving high overall throughput across the full 320 MHz bandwidth, preventing the stability issues that would arise from treating the entire wide band as a single channel.
Solution Approach 2:
Different LTF sequences are assigned to different spatial streams and frequency sub-bands within the 320 MHz spectrum. This local differentiation optimizes the signal characteristics for each specific sub-channel, maintaining transmission stability in each local region while achieving high aggregate throughput across the entire system.
Data Source
AI summary
The present disclosure is related to a wireless local area network (WLAN) system. A transmitting station (STA) can generate a physical protocol data unit (PPDU) and transmit the PPDU, the PPDU can include a long training field (LTF) signal, and the LTF signal can be generated on the basis of an LTF sequence for a 320 MHZ band.