Distributed Pilot Tones for PSD-Limited 6 GHz Range
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Solution Overview
Problem
Existing wireless communication systems face challenges in maintaining effective range and packet detection due to power spectral density (PSD) limits, particularly in the 6 GHz frequency band where APs and STAs are restricted to low power indoor (LPI) classes.
Innovation Solution
The implementation of a distributed tone plan that maps pilot tones to noncontiguous subcarrier indices across a wider bandwidth, allowing for a more even distribution of pilot tones across the wireless channel and enhancing robustness against interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If PSD limits are applied to 6 GHz band transmissions, then spectral efficiency is maintained, but transmit power and communication range are reduced
Solution Approach 1:
The patent segments the frequency spectrum into multiple resource units (RUs) with different bandwidth allocations. By dividing the available spectrum into smaller controllable segments, the system can apply PSD limits selectively to each segment while maintaining overall transmit power through coordinated transmission across multiple segments, thus resolving the contradiction between spectral efficiency and transmit power.
Solution Approach 2:
The patent dynamically changes transmission parameters including bandwidth allocation, subcarrier mapping, and pilot tone distribution across different RUs. By adjusting these parameters, the system optimizes the balance between adhering to PSD limits and achieving sufficient transmit power for desired communication range, directly addressing the power-spectral efficiency tradeoff.
2Quantity of substance
If PSD limits are applied to 6 GHz band transmissions, then spectral efficiency is maintained, but communication range is reduced
Solution Approach 1:
The patent divides the communication signal into multiple RUs transmitted across different frequency segments. This segmentation allows the system to maintain spectral efficiency within PSD limits while achieving extended communication range through frequency diversity and coordinated multi-segment transmission, effectively resolving the range-spectral efficiency contradiction.
Solution Approach 2:
The patent transitions from single-frequency-band transmission to multi-segment frequency domain transmission. By distributing pilot tones and data across multiple frequency dimensions (different RUs with different bandwidths), the system achieves both spectral efficiency compliance and extended range through frequency diversity gains.
3Reliability
If pilot tones are mapped to noncontiguous subcarrier indices across wider bandwidth, then robustness against interference is enhanced, but system complexity increases
Solution Approach 1:
The patent segments pilot tone allocation across multiple RUs with noncontiguous subcarrier indices. By distributing pilot tones across different frequency segments rather than concentrating them, the system achieves robustness against frequency-selective interference while managing complexity through standardized segmentation patterns defined in the tone plan.
Solution Approach 2:
The patent changes the mapping parameters of pilot tones from contiguous to noncontiguous subcarrier indices across wider bandwidth. This parameter change enhances interference robustness through frequency diversity, while the complexity is managed by establishing systematic mapping rules in the tone plan that simplify implementation.
Data Source
AI summary
This disclosure provides methods, devices and systems for increasing the transmit power of wireless communication devices operating on power spectral density (PSD)-limited wireless channels. Some implementations more specifically relate to pilot tone designs that support distributed transmission. A transmitting device may modulate a physical layer convergence protocol (PLCP) protocol data unit (PPDU) on a number (M) of tones representing a logical RU associated with the legacy tone plan and may further map the M tones to M noncontiguous subcarrier indices associated with a wireless channel. The transmitting device may transmit the PPDU, over the wireless channel, with a number (N) of pilot tones each having a respective location relative to the M tones as mapped to the M noncontiguous subcarrier indices. In some implementations, the relative locations of the N pilot tones may be different than relative locations of a number (K) of pilot tones associated with the logical RU.