Sub-band Whitening for Partial-Band Interference Mitigation
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Solution Overview
Problem
In Wi-Fi communication systems, partial-band interference causes severe performance degradation due to contention-based transmission opportunities and overlapping basic service sets, affecting sub-bands within wide-band transmissions.
Innovation Solution
A method and system that derive an estimated noise plus interference variance (NIVar) based on legacy-long training field (LLTF) symbols and update an interference whitening factor using sub-band NIVar to perform frequency-domain-based signal whitening, mitigating interference effects on 20 MHz sub-bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wide-band transmission (40/80/160 MHz) is used to increase bandwidth, then data rate is improved, but partial-band interference from overlapping basic service sets causes severe performance degradation
Solution Approach 1:
The patent divides the wide-band transmission into multiple 20 MHz sub-bands and processes each sub-band separately. By segmenting the frequency spectrum, the system can identify and mitigate interference in affected sub-bands while maintaining transmission in clean sub-bands, thus resolving the contradiction between using wide-band for high data rate and avoiding interference for reliable performance
Solution Approach 2:
The patent applies different processing and interference mitigation strategies to different sub-bands based on their individual interference conditions. Each sub-band is treated with local quality adjustments rather than uniform processing, allowing optimal performance in each frequency segment while maintaining overall system productivity
2Reliability
If sub-band specific interference mitigation is applied to improve performance in interfered sub-bands, then reliability is improved, but system complexity increases
Solution Approach 1:
The patent segments the interference mitigation process into modular sub-band processing units. Each sub-band can be processed independently with standardized algorithms, which reduces overall system complexity compared to a monolithic approach while still achieving improved reliability in interfered sub-bands
Solution Approach 2:
The patent applies interference mitigation selectively only to sub-bands that are actually affected by interference, rather than processing all sub-bands uniformly. This partial action approach improves reliability where needed while minimizing the additional system complexity introduced by mitigation algorithms
Data Source
AI summary
A method and system for providing sub-band whitening are herein provided. According to one embodiment, a method includes deriving an estimated noise plus interference variance (NIVar) based on at least one legacy-long training field (LLTF) symbol from an LLTF signal; and updating an interference whitening (IW) factor by using a sub-band NIVar.