Distributed Tone Mapping Across RUs Under PSD Limits
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Solution Overview
Problem
Wireless communication devices face reduced transmission ranges and packet detection capabilities due to power spectral density (PSD) limits, which also affect channel estimation.
Innovation Solution
Implementing tone mapping and resource unit duplication techniques to increase the frequency bandwidth for wireless transmissions, allowing for higher PSD limits and improved transmit power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If tone mapping and resource unit duplication techniques are implemented to increase frequency bandwidth, then transmit power and transmission range are improved, but device complexity and processing requirements increase
Solution Approach 1:
The patent divides the frequency spectrum into multiple resource units (RUs) and applies tone mapping to distribute tones across these segmented RUs. This segmentation allows the system to increase effective transmit power by spreading signals across multiple frequency segments while managing complexity through structured division of the spectrum into manageable units.
Solution Approach 2:
The patent employs resource unit duplication where identical or redundant copies of resource units are transmitted across different frequency segments. This copying technique enhances transmit power and reliability through diversity while the standardized copy structure helps manage processing complexity through predictable patterns.
2Length of moving object
If PSD limits are increased to improve transmission range, then signal quality and transmission range are improved, but packet detection and channel estimation capabilities are reduced
Solution Approach 1:
The patent applies different tone mapping strategies to different local regions of the frequency spectrum. By optimizing tone distribution and resource unit allocation for specific frequency segments, the system can improve transmission range in certain bands while maintaining packet detection and channel estimation capabilities in others through localized quality adjustments.
Solution Approach 2:
The patent transitions from conventional single-dimension frequency allocation to a multi-dimensional approach by distributing tones across both frequency and resource unit dimensions. This dimensional expansion allows the system to achieve extended transmission range while preserving measurement capabilities through diverse signal paths and redundancy across dimensions.
3Area of stationary object
If contiguous tones are mapped to non-contiguous distributed tones across frequency spectrum, then frequency bandwidth is increased, but processing complexity and computational requirements increase
Solution Approach 1:
The patent segments the frequency bandwidth into discrete resource units with structured tone allocations. This segmentation transforms the complex problem of mapping contiguous to non-contiguous tones into a series of manageable, standardized mappings across segmented units, reducing processing complexity through systematic division.
Solution Approach 2:
The patent employs parameter-based tone mapping where the mapping behavior is controlled by configurable parameters such as tone mapping distance (DTM) and resource unit configurations. By changing these parameters, the system can adapt the mapping complexity to match processing capabilities while achieving the desired frequency bandwidth utilization.
Data Source
AI summary
This disclosure provides systems, methods, and apparatuses for wireless communication. An example apparatus selects a resource unit (RU) for a physical (PHY) layer convergence protocol (PLCP) protocol data unit (PPDU). The selected RU includes a set of contiguous tones spanning a bandwidth. The apparatus maps the set of contiguous tones to a set of non-contiguous tones distributed across the frequency spectrum, and transmits the PPDU over the set of non-contiguous tones. Another example apparatus selects an RU of a group of RUs that collectively span a frequency spectrum, and formats a PPDU based on a first frequency bandwidth wider than the selected RU's bandwidth. The apparatus parses the contiguous tones of the selected RU to a set of non-contiguous tones spanning a unique segment of a second frequency bandwidth wider than the first frequency bandwidth, and schedules a transmission of the PPDU over the set of non-contiguous tones.