Customized Frequency Rotation for WiFi 7 Punctured Channels

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Solution Overview

Problem

Current WiFi 7 standards use the same frequency rotation values for all channel configurations, leading to increased Peak to Average Power Ratio (PAPR) in punctured channels, which affects transmitter performance and link quality.

Innovation Solution

Customized frequency rotation values are selected per channel configuration to optimize PAPR performance, reducing the maximum PAPR value below a predetermined threshold by applying different frequency rotation values for each puncturing configuration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If the same frequency rotation values are used for all channel configurations, then device complexity is reduced and ease of operation is improved, but PAPR performance deteriorates and transmitter performance worsens

Engineering Contradiction:

Improvefrequency rotation configurationVSAvoidtransmitter performance

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent applies different frequency rotation values to different channel configurations (80MHz, 160MHz, 320MHz) and different puncturing patterns. Each channel configuration has its own optimized frequency rotation values tailored to its specific characteristics, rather than using a universal set of values. This local optimization reduces PAPR for each specific configuration while maintaining manageable system complexity through structured organization.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes the frequency rotation parameter values based on channel configuration and puncturing pattern. By adjusting these parameters according to specific channel bandwidths and puncturing configurations, the system optimizes PAPR performance for each scenario. The frequency rotation values are modified to match the mathematical relationships specific to each channel configuration.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If customized frequency rotation values are selected per channel configuration, then PAPR performance is improved and transmitter performance is enhanced, but device complexity increases

Engineering Contradiction:

Improvetransmitter performanceVSAvoidfrequency rotation configuration

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent segments the frequency rotation values into different groups corresponding to different channel configurations (80MHz, 160MHz, 320MHz) and puncturing patterns. Each segment is independently optimized for its specific configuration. This segmentation allows customized values for each scenario while organizing the complexity into manageable, structured groups that can be efficiently stored and retrieved.

Inventive Principle:

Principle #1Segmentation

3Ease of manufacture

If the same frequency rotation values are repeated for remainder sub-channels, then ease of manufacture is improved, but PAPR increases for some puncturing combinations

Engineering Contradiction:

Improvestandard implementationVSAvoidPAPR

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

Instead of uniformly repeating frequency rotation values across all sub-channels, the patent applies different frequency rotation values to different 20MHz sub-channels based on their specific puncturing configuration. Each sub-channel receives locally optimized rotation values that account for its position and the overall puncturing pattern, thereby reducing PAPR while maintaining ease of implementation through systematic assignment.

Inventive Principle:

Principle #3Local quality

4Reliability

If high backoffs are used to compensate for increased PAPR, then transmitter performance is maintained, but loss of energy increases and productivity decreases

Engineering Contradiction:

Improvelink qualityVSAvoidtransmitter power

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent applies frequency rotation values in advance to the OFDM symbols before transmission. By pre-processing the signal with configuration-specific frequency rotation values, the system proactively reduces PAPR before transmission occurs. This preliminary action prevents the need for subsequent high backoffs, thereby conserving energy and maintaining productivity while ensuring reliable transmission.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20250039026A1Use of customized frequency rotation for punctured channels

Publication Date: 2025.01.30 INTEL CORP

AI summary

Techniques are disclosed for determining customized frequency rotation values for a number of wireless channel configurations. The channel configurations may define various parameters of a wireless channel in accordance with a communication protocol, such as the channel bandwidth, the number of sub-channels, and which of the sub-channels may be punctured. The frequency rotation values may be obtained by determining the Peak to Average Power Ratio (PAPR) values for different combinations of frequency rotation values that are applied to the sub-channels of the wireless channel on a per-configuration basis. Thus, for each configuration, the lowest maximum PAPR or other suitable threshold value may be used to identify the frequency rotation values for that particular configuration. The frequency rotation values may then be applied at run time based upon the current wireless channel configuration for data transmissions via the wireless channel.