Short Training Field Sequence for 240 MHz WLAN
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Solution Overview
Problem
The IEEE 802.11ax standard fails to meet user requirements for high throughput, low jitter, and low delay in wireless communication, particularly with the need for a next-generation WLAN technology that supports ultra-high transmission rates and high user density, necessitating a new short training field sequence for larger channel bandwidths.
Innovation Solution
A method and apparatus for transmitting a physical layer protocol data unit (PPDU) with a short training field, where the frequency domain sequence length is greater than that of a PPDU transmitted on a 160 MHz channel, specifically designed for channels with bandwidths of 240 MHz and 320 MHz, optimizing the sequence through simulation to achieve better performance and compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the IEEE 802.11ax standard is used, then existing channel bandwidths are supported, but high throughput and low delay requirements cannot be met
Solution Approach 1:
The patent changes the channel bandwidth parameter from traditional values (20, 40, 80, 160 MHz) to extended values (240, 320 MHz) to achieve ultra-high throughput. This parameter change enables the system to meet modern data traffic requirements while maintaining compatibility through proper training field design
2Productivity
If ultra-large bandwidths of 240 MHz and 320 MHz are used, then ultra-high transmission rates are achieved, but a new short training field sequence is needed
Solution Approach 1:
The patent segments the frequency domain sequence into multiple parts that can be independently configured and optimized. By dividing the sequence into manageable segments with specific patterns, the system achieves the required performance for ultra-wide bandwidths while maintaining structured design that simplifies implementation
Solution Approach 2:
The patent creates a new short training field sequence for 240/320 MHz bandwidths by extending and adapting the proven sequence design from 160 MHz. This copying approach with modifications allows the system to leverage existing successful designs while adapting them to new bandwidth requirements, reducing development complexity
3Measurement precision
If a short training field sequence for larger bandwidth is designed, then automatic gain control estimation is improved, but the sequence length must be increased
Solution Approach 1:
The patent applies different sequence patterns to different frequency subcarriers within the wide bandwidth. By optimizing the sequence locally for each frequency region rather than using a uniform approach, the system achieves improved automatic gain control estimation accuracy without requiring a proportional increase in overall sequence length
Data Source
AI summary
A method and an apparatus for transmitting a physical layer protocol data unit that can provide a short training field sequence for a larger channel bandwidth. The short training field sequence has a smaller peak-to-average power ratio PAPR and better performance. The method includes: generating a physical layer protocol data unit PPDU, where the PPDU includes a short training field, a length of a frequency domain sequence of the short training field is greater than a first length, and the first length is a length of a frequency domain sequence of a short training field of a PPDU transmitted on a channel with a bandwidth of 160 MHz; and sending the PPDU on a target channel, where a bandwidth of the target channel is greater than 160 MHz.