WAP Partial Sounding Feedback Expansion for MIMO Channel Characterization
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Solution Overview
Problem
Current wireless local area networks (WLANs) face limitations in downlink throughput due to the mismatch between the sounding feedback capabilities of wireless access points (WAPs) and associated stations, particularly when stations cannot provide full sounding feedback matching the WAP's capabilities, leading to underdimensioned beamforming and reduced signal strength.
Innovation Solution
The implementation of a method and apparatus for a WAP that supports orthogonal frequency division multiplexed (OFDM) communications, featuring a sounding mode circuit, spatial mapper, partial sounding feedback expander, and beamforming matrix calculator, which enables either full or composite sounding modes to fully characterize the communication channel, even when stations provide partial feedback, by spatially mapping and expanding partial sounding feedback into full beamforming matrices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If full sounding mode is used to fully characterize the communication channel, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent segments the sounding process into two distinct modes: full sounding mode for comprehensive channel characterization and composite sounding mode for simplified operation. This segmentation allows the system to choose the appropriate level of complexity based on the specific communication scenario and station capabilities, resolving the contradiction between measurement precision and device complexity.
Solution Approach 2:
The patent implements partial sounding feedback expansion where the WAP can operate with reduced sounding feedback from stations (partial action) while still achieving adequate channel characterization through intelligent processing. This allows the system to obtain sufficient measurement precision without requiring full sounding capability from all stations, thereby reducing the overall device complexity burden.
2Device complexity
If composite sounding mode with partial feedback expansion is used, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent introduces an intermediary processing layer at the WAP that receives partial sounding feedback from stations and expands it into full channel characterization information. This intermediary expansion process acts as a bridge, allowing the system to operate with reduced complexity (partial feedback from stations) while maintaining high measurement precision (full channel characterization at WAP) through intelligent signal processing.
3Strength
If full beamforming matrix calculation is performed, then signal strength is improved, but use of energy increases
Solution Approach 1:
The patent enables the system to achieve adequate signal strength by performing full beamforming matrix calculation only when necessary (in full sounding mode), while allowing composite sounding mode to operate with reduced processing. This partial action approach ensures high signal strength is achieved when needed while reducing energy consumption in scenarios where full precision is not required, resolving the contradiction between signal strength and energy usage.
Data Source
AI summary
A WAP including: a spatial mapper component, a partial sounding feedback expander circuit and a beamforming matrix calculator. The spatial mapper component spatially maps the transmission of a single MIMO sounding packet with either a single full spatial mapping matrix (SMM) or a set of “N” partial SMM responsive respectively to a full or composite sounding mode designation. The partial sounding feedback expander circuit in the composite sounding mode, expands partial sounding feedback received from a targeted station in response to the single MIMO sounding packet into a full sounding feedback. The beamforming matrix calculator calculates a full beamforming matrix for transmitting downlink communications to the targeted station from the full sounding feedback provided by either the partial sounding feedback expander circuit in the composite sounding mode, or the full sounding feedback received directly from the targeted station in the full sounding mode.