Distributed-Tone Resource Unit Tone Shifting for Spectrum Mask

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Solution Overview

Problem

In wireless communications, particularly in Wi-Fi systems using Distributed-Tone Resource Units (DRUs), there is a need to optimize DRUs to improve the spectrum mask and reduce Power Amplifier (PA) backoff, which is necessary to meet spectrum mask requirements.

Innovation Solution

The proposed solution involves generating a DRU according to a tone plan and applying a first shift and a second shift to tones in the first and second halves of the tone plan, respectively. This optimization preserves more edge tones, improving the spectrum mask and reducing PA backoff, while maintaining the hierarchical structure and tone distribution pattern of the original DRU tone plan.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a larger PA backoff is applied to meet spectrum mask requirements, then the spectrum mask requirement is satisfied, but the transmission power is reduced

Engineering Contradiction:

Improvespectrum maskVSAvoidtransmission power

Core Design Contradiction:

Object-affected harmful factorsVSPower

Solution Approach 1:

The patent applies parameter changes by shifting the tone plan indices to reallocate spectral resources. Specifically, the tone plan is shifted such that data tones are positioned at different frequency locations, which changes the spectral distribution parameters to achieve better spectrum mask compliance without requiring excessive PA backoff

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces a dimensional change by applying both a first shift to tones in the first half of the tone plan and a second shift to tones in the second half. This multi-dimensional shifting approach allows optimization of the spectrum mask in the frequency domain while preserving the hierarchical structure and tone distribution pattern

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Object-affected harmful factors

If DRU tone plan is optimized to preserve more edge tones, then the spectrum mask is improved, but the tone distribution pattern may be altered

Engineering Contradiction:

Improvespectrum maskVSAvoidtone distribution pattern

Core Design Contradiction:

Object-affected harmful factorsVSStability of the object's composition

Solution Approach 1:

The patent applies local quality by applying different shift amounts to different portions of the tone plan. The first shift is applied to tones in the first half while the second shift is applied to tones in the second half, allowing localized optimization of edge tones in specific frequency regions while preserving the overall hierarchical structure and tone distribution pattern

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent segments the tone plan into a first half and a second half, applying separate shift operations to each segment. This segmentation allows independent optimization of edge tones in different frequency regions while maintaining the overall structure and distribution pattern of the DRU tone plan

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS20250141616A1Distributed-Tone Resource Unit Optimization To Improve Sepctrum Mask In Wireless Communications

Publication Date: 2025.05.01 MEDIATEK INC

AI summary

Techniques pertaining to distributed-tone resource unit (DRU) optimization to improve spectrum mask in wireless communications are described. An apparatus (e.g., a station (STA)) generates a DRU according to a tone plan. The apparatus also applies a first shift and a second shift to tones of the DRU in a first half of the tone plan and tones of the DRU in a second half of the tone plan, respectively. The apparatus then performs a wireless communication with the DRU.