EHT-LTF P-Matrix Structure for Wi-Fi Spatial Streams Beyond Eight
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Solution Overview
Problem
Existing wireless local area network (WLAN) technologies, such as the 802.11ax standard, are limited in supporting simultaneous data transmission on more than eight spatial streams due to the constraints of the P matrix, which hinders efficient channel estimation and data transmission efficiency in next-generation Wi-Fi standards like 802.11be.
Innovation Solution
The introduction of a P matrix with an order greater than 8, where the first row includes elements with values of 1 and -1, allows for channel estimation on multiple spatial streams exceeding eight, reducing spectral line protrusion and simplifying calculation processes, while utilizing predefined EHT-LTF sequences and Toeplitz matrices to optimize storage and reduce overheads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional P matrix with order n≤8 is used, then the system can maintain simplicity in calculation and storage, but it cannot support channel estimation on channels with more than eight spatial streams
Solution Approach 1:
The patent changes the order parameter of the P matrix from n≤8 to n>8, enabling support for more than eight spatial streams. This parameter change allows the system to accommodate higher spatial stream configurations while maintaining the orthogonal matrix structure necessary for channel estimation
Solution Approach 2:
The patent segments the P matrix into specific structures with particular row patterns (first row with elements of 1 and -1, second row with specific relationships to the first row). This segmentation approach allows the matrix to handle higher dimensions while maintaining computational tractability through structured design
2Ease of manufacture
If the first row of the P matrix contains only elements with value 1, then the matrix structure is simple, but it causes spectral line protrusion that degrades signal quality
Solution Approach 1:
The patent introduces asymmetry into the first row of the P matrix by including both elements with value 1 and elements with value -1. This asymmetric pattern prevents the spectral line protrusion caused by uniform all-1 patterns while maintaining a relatively simple structured form that is easier to implement than completely arbitrary patterns
3Measurement precision
If the P matrix order is increased to support more than eight spatial streams, then channel estimation capability is improved, but storage and calculation complexity increase
Solution Approach 1:
The patent changes the order parameter of the P matrix from n≤8 to n>8, enabling support for more than eight spatial streams. This parameter change allows the system to accommodate higher spatial stream configurations while maintaining the orthogonal matrix structure necessary for channel estimation
Solution Approach 2:
The patent applies local quality by specifying particular patterns for specific rows of the P matrix (first row with 1 and -1 elements, second row with specific relationships). This localized structuring reduces overall calculation and storage complexity by imposing regular patterns on critical portions of the matrix rather than requiring completely general structures
Data Source
AI summary
A physical layer protocol data unit (PPDU) transmission method is provided. The method includes generating a PPDU, where the PPDU includes an extremely high throughput-long training field (EHT-LTF). The EHT-LTF is obtained based on a P matrix and a predefined EHT-LTF sequence. The P matrix is an n×n orthogonal matrix, n is an integer greater than 8, and a first row of the P matrix includes at least one element whose value is 1 and at least one element whose value is −1. The method further includes sending the PPDU. This application may be applied to a wireless local area network (WLAN) system supporting a next-generation wireless fidelity (Wi-Fi) extremely high throughput (EHT) protocol of IEEE 802.11, for example, 802.11 protocols such as 802.11be.