Short Training Sequence Layout for >160 MHz Wi‑Fi Compatibility
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Solution Overview
Problem
The challenge of designing a short training sequence for higher channel bandwidths, particularly beyond 160 MHz, while maintaining backward compatibility with existing standards, is not adequately addressed in current wireless communication protocols.
Innovation Solution
A method and apparatus for designing a short training sequence that supports channel bandwidths greater than 160 MHz by utilizing inverse fast Fourier transformation (IFFT) on sequences derived from M-sequences or high efficiency frequency-domain sequences, ensuring compatibility with existing standards and reducing peak-to-average power ratio (PAPR) for improved automatic gain control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a short training sequence is designed for higher channel bandwidth (>160 MHz), then the channel bandwidth support is improved, but backward compatibility with existing standards deteriorates
Solution Approach 1:
The short training sequence is segmented into multiple parts: a first part with a first period and a second part with a second period. The first part maintains compatibility with existing standards (802.11ax), while the second part is designed for higher bandwidth channels. This segmentation allows the sequence to serve both legacy and advanced systems simultaneously.
Solution Approach 2:
The patent introduces a time-domain dimension by using different periods within the same sequence. The first part uses a first period suitable for existing standards, while the second part uses a second period optimized for higher bandwidth. This dimensional approach allows compatibility across different bandwidth requirements without sacrificing either.
2Reliability
If exhaustive simulation is performed on parameters to verify small PAPR, then the automatic gain control estimation effect is improved, but the computational complexity and time increase
Solution Approach 1:
The patent performs preliminary design of the short training sequence with specific structural characteristics that inherently promote low PAPR. By pre-configuring the sequence with a first part and second part having different periods and specific amplitude relationships, the design ensures good automatic gain control estimation performance before actual simulation verification is needed.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed solution enables effective automatic gain control on high-bandwidth channels, reducing the receive bit error rate and maintaining compatibility with existing systems, as verified through simulation.
Implementation Method 1
sending a short training field on a target channel, where the short training field is obtained by performing inverse fast Fourier transformation IFFT on the short training sequence
Data Source
AI summary
The application provides a short training sequence design method and apparatus. The method includes: determining a short training sequence, where the short training sequence may be obtained based on an existing sequence, and the short training sequence with comparatively good performance may be obtained through simulation calculation, for example, by adjusting a parameter; and sending a short training field on a target channel, where the short training field is obtained by performing inverse fast Fourier transformation IFFT on the short training sequence, and a bandwidth of the target channel is greater than 160 MHz.