HE-STF Tone Mapping for 802.11ax NDP Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The current IEEE 802.11ax standard for HE TB NDP feedback PPDU lacks a defined tone map for the HE-STF, leading to potential overlap or incomplete tone allocation in larger bandwidths, which affects the accuracy and efficiency of channel feedback in OFDMA systems.
Innovation Solution
The proposed solution defines specific tone mapping and sequence designs for the HE-STF in HE TB NDP feedback PPDU, using equations such as HES−120:8:120, HES−248:8:248, and HES−504:8:504 to allocate tones within 20 MHz, 40 MHz, and 80 MHz bandwidths, ensuring proper alignment with HE-LTF tones and accommodating different bandwidth configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the current IEEE 802.11ax standard is used without defined tone mapping for HE-STF, then device complexity is reduced, but tone allocation accuracy deteriorates leading to overlap or incomplete allocation in larger bandwidths
Solution Approach 1:
The patent applies parameter changes by defining specific tone mapping equations (HES−120:8:120, HES−248:8:248, HES−504:8:504) that adapt the HE-STF tone allocation parameters to different bandwidth configurations. These equations transform the tone indices based on the sub-channel bandwidth (20 MHz, 40 MHz, or 80 MHz), ensuring accurate tone allocation without requiring complex additional hardware or processing.
2Measurement precision
If tone mapping is defined for all bandwidth configurations, then channel feedback accuracy is improved, but device complexity increases
Solution Approach 1:
The patent segments the bandwidth into standardized sub-channels (20 MHz, 40 MHz, 80 MHz) and provides specific tone mapping equations for each segment. This segmentation allows the system to handle different bandwidth configurations using dedicated, simplified equations rather than a single complex general-purpose mapping mechanism, thereby improving channel feedback accuracy while maintaining manageable device complexity.
Data Source
AI summary
This disclosure describes systems, methods, and devices related to tone mapping for a high-efficiency (HE) trigger-based (TB) null data packet (NDP) feedback physical layer protocol data unit (PPDU). A device may identify a frame received from a second device. The device may determine, based on the frame, a resource unit allocated to the device, wherein the resource unit is associated with a 20 MHz sub-channel of a bandwidth. The device may determine, based on the resource unit and the bandwidth, tones associated with a HE short training field (HE-STF) of a HE TB NDP feedback PPDU. The device may send the HE TB NDP feedback PPDU to the second device in the 20 MHz sub-channel, wherein the HE TB NDP feedback PPDU includes the tones.