Wireless Spur Measurement Exchange for High-Order QAM Correction

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Solution Overview

Problem

Wireless communication systems face challenges in accurately mitigating RF spurs, which cause interference and degrade performance, especially in high SNR modulation schemes like 4K QAM or 16K QAM, due to limitations in existing spur measurement and compensation techniques.

Innovation Solution

A first wireless communication device receives spur measurement information from a second device, including baseband frequency and expected power, to compensate for frequency domain spurs using LMMSE estimation, while the second device transmits spur suppression capability information to facilitate accurate spur correction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If conventional spur measurement and compensation techniques are used, then implementation simplicity is maintained, but measurement precision and correction accuracy are insufficient for high SNR modulation schemes

Engineering Contradiction:
Improvespur measurement accuracyVSAvoidcomplexity of spur compensation system
Core Design Contradiction:
Measurement precisionVSDevice complexity

Solution Approach 1:

The transmitting device performs spur measurements and generates compensation information in advance, before the receiving device needs to use it. This preliminary action allows the receiving device to simply apply the pre-calculated compensation without performing complex measurements itself, thereby improving measurement precision while keeping the receiving device complexity low.

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The patent introduces an intermediary compensation mechanism where the transmitting device measures spurs and generates compensation information that is then transmitted to the receiving device. This intermediary approach allows the receiving device to benefit from accurate spur measurements without having to implement complex measurement and compensation systems itself.

Inventive Principle:
Principle #24Intermediary (Mediator)

2Reliability

If existing spur compensation methods are applied, then system complexity remains low, but the adverse effects of spurs cannot be sufficiently mitigated for high-order modulation schemes

Engineering Contradiction:
Improveperformance reliability in high SNR conditionsVSAvoidcomplexity of spur mitigation system
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The transmitting device performs spur measurements and generates compensation information in advance, before the receiving device needs to use it. This preliminary action allows the receiving device to simply apply the pre-calculated compensation without performing complex measurements itself, thereby improving measurement precision while keeping the receiving device complexity low.

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The patent implements a feedback mechanism where the transmitting device measures its own spur characteristics and generates compensation information based on these measurements. This feedback loop allows the system to continuously adapt and improve spur mitigation, enhancing reliability for high-order modulation schemes while managing system complexity through intelligent design.

Inventive Principle:
Principle #23Feedback

3Productivity

If high-order modulation schemes like 4K QAM or 16K QAM are used, then throughput is improved, but the system becomes more sensitive to spur interference and SNR constraints

Engineering Contradiction:
Improvedata throughputVSAvoidrobustness against spur interference
Core Design Contradiction:
ProductivityVSReliability

Solution Approach 1:

The patent converts the harmful effect of spurs into a beneficial outcome by measuring and characterizing the spur interference, then using this information to generate compensation signals. This approach allows the system to maintain high-order modulation schemes for high throughput while actively mitigating the adverse effects of spurs, thereby preserving reliability.

Inventive Principle:
Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent changes the parameter space by introducing spur measurement parameters (frequency, power, phase) and using these to dynamically adjust compensation signals. This parameter-based approach enables the system to adapt to varying spur conditions while maintaining the high throughput benefits of high-order modulation schemes.

Inventive Principle:
Principle #35Parameter changes

Data Source

PatentUS12537655B2Measurement information for spur estimation and correction
Publication Date: 2026.01.27 QUALCOMM INC
  • US12537655B2 patent drawing
  • US12537655B2 patent drawing
  • US12537655B2 patent drawing

AI summary

A first wireless communication device receives spur measurement information associated with one or more frequency domain spurs in a transmission signal spectrum of a second wireless communication device. The spur measurement information indicates a baseband frequency and an expected power of each of the one or more frequency domain spurs. The first wireless communication device receives one or more signals from the second wireless communication device and processes the one or more signals in accordance with the spur measurement information to compensate the one or more signals for the one or more frequency domain spurs in the transmission signal spectrum of the second wireless communication device. In some implementations, the first wireless communication device receives the spur measurement information in association with transmitting spur suppression capability information that indicates a capability of the first wireless device to estimate and correct frequency domain spurs.