Comb Resource Unit Tone Mapping for PSD Compliance
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Solution Overview
Problem
Current RF communication technologies face limitations in power spectral density (PSD) due to regulatory constraints, which hinder the ability to increase transmit power for longer-range communications or in noisy channels, especially in compliance with ETSI and FCC regulations.
Innovation Solution
The implementation of a comb resource unit (RU) tone mapping scheme that distributes tones across a wider bandwidth, allowing for power spectral density boosting without exceeding regulatory limits, by allocating a comb RU structure that includes non-adjacent tones over a larger channel bandwidth, and optionally using RU duplication for further range extension without increasing PSD.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If transmit power is increased for longer-range communication, then communication range is improved, but power spectral density exceeds regulatory limitations
Solution Approach 1:
The patent segments the frequency spectrum by distributing tones non-adjacently across the channel bandwidth. Instead of concentrating power in adjacent subcarriers, the comb RU structure spreads tones at intervals (e.g., every 4th subcarrier), effectively dividing the power spectral density across multiple frequency segments while maintaining total transmit power for extended range communication.
Solution Approach 2:
The patent transitions from a spatial concentration of tones (adjacent subcarriers) to a frequency distribution pattern (non-adjacent comb structure). By mapping resource units to non-contiguous frequency resources rather than contiguous blocks, the system achieves power spectral density reduction in the frequency dimension while preserving communication range through maintained total power.
2Reliability
If transmit power is increased to overcome noisy channels, then communication reliability is improved, but power spectral density exceeds regulatory limitations
Solution Approach 1:
The comb RU structure segments power distribution across non-adjacent subcarriers, allowing the system to maintain high total transmit power for reliable communication in noisy channels while keeping the power spectral density at each frequency segment within regulatory limits. The segmentation enables full power utilization without PSD violation.
3Object-affected harmful factors
If standard resource unit allocation is used, then power spectral density remains within limits, but transmit power is insufficient for longer-range communication
Solution Approach 1:
The patent changes the frequency allocation pattern from contiguous to non-contiguous comb structure. This dimensional change in resource unit allocation allows the system to maintain PSD compliance through distributed frequency placement while simultaneously enabling higher effective transmit power by utilizing the full channel bandwidth for power transmission without concentration in narrow bands.
Data Source
AI summary
Embodiments of an access point (AP) station (STA) configured for operating in a next-generation (NG) wireless local area network (WLAN) (i.e., EHT) are generally described herein. In some embodiments, a comb resource unit (RU) structure may be used to distribute tones of an RU across a wider bandwidth for narrow RU power spectral density (PSD) boosting for longer-range transmission in EHT to meet ETSI and/or FCC limitations.