Distributed Tone Mapping for PSD-Limited Wireless Transmission

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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 higher PSD limits and thus increasing the maximum transmit power.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If PSD limits are applied to wireless transmissions, then transmission power is constrained to meet regulatory requirements, but transmission range and signal quality deteriorate

Engineering Contradiction:

ImprovePSD limit complianceVSAvoidtransmission range

Core Design Contradiction:

Object-affected harmful factorsVSLength of moving object

Solution Approach 1:

The patent segments the frequency spectrum by mapping contiguous tones to non-contiguous distributed tones across the spectrum. This segmentation allows the transmission to span a wider frequency bandwidth while maintaining PSD compliance in each individual frequency bin, thereby extending transmission range without violating regulatory limits.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent transitions from a one-dimensional contiguous frequency allocation to a two-dimensional distributed frequency allocation across the spectrum. By distributing tones across multiple frequency bins rather than concentrating them contiguously, the system increases the effective bandwidth utilization while maintaining PSD compliance, thus improving transmission range and signal quality.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Object-affected harmful factors

If PSD limits are applied to wireless transmissions, then transmission power is constrained, but maximum transmit power and data rates are reduced

Engineering Contradiction:

ImprovePSD limit complianceVSAvoidmaximum transmit power

Core Design Contradiction:

Object-affected harmful factorsVSPower

Solution Approach 1:

The patent segments the frequency spectrum into multiple distributed bins and allocates tones across these segments. This allows the total transmit power to be distributed across a wider bandwidth, increasing the maximum transmit power capability while maintaining PSD compliance in each segment, thereby resolving the contradiction between PSD limits and maximum transmit power.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent changes the frequency domain parameters by mapping contiguous tones to non-contiguous distributed tones across the spectrum. This parameter transformation increases the effective bandwidth utilization and allows higher total transmit power while maintaining PSD compliance, thus resolving the contradiction between PSD limits and maximum transmit power.

Inventive Principle:

Principle #35Parameter changes

3Ease of operation

If conventional tone mapping is used, then contiguous tones are allocated in frequency, but frequency bandwidth utilization is limited under PSD constraints

Engineering Contradiction:

Improvetone allocation simplicityVSAvoidfrequency bandwidth

Core Design Contradiction:

Ease of operationVSArea of stationary object

Solution Approach 1:

The patent segments the frequency spectrum into multiple distributed bins and maps contiguous tones to non-contiguous positions across these bins. This segmentation strategy expands the effective frequency bandwidth utilization while maintaining operational simplicity through systematic mapping rules, thereby resolving the contradiction between ease of operation and frequency bandwidth utilization.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent transitions from one-dimensional contiguous frequency allocation to two-dimensional distributed frequency allocation across the spectrum. This dimensional transformation allows the system to utilize a broader frequency bandwidth while maintaining simple mapping relationships, thus resolving the contradiction between operational simplicity and frequency bandwidth utilization.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS20260058771A1Distributed tone mapping for power spectral density (PSD) limits

Publication Date: 2026.02.26 QUALCOMM INC

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.