Adaptive Impulse Noise Mitigation via Dynamic Zero-Subcarrier Count

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Solution Overview

Problem

Existing data transmission systems, particularly OFDM systems, face challenges in mitigating impulsive noise due to varying sparsity over time, leading to inaccurate noise estimation and throughput issues when using fixed numbers of zero-subcarriers.

Innovation Solution

A Multi Mode Compressive Sensing (MMCS) scheme that adaptively adjusts the number of pilots based on current impulsive noise severity to stabilize Bit Error Rate (BER) and improve data throughput by dynamically changing the number of zero-subcarriers used for noise reconstruction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a fixed number of zero-subcarriers is used to reconstruct impulsive noise, then the system complexity is reduced, but the reliability deteriorates when the disturbance ratio of impulsive noise is high

Engineering Contradiction:
Improvesystem complexityVSAvoidreliability
Core Design Contradiction:
Device complexityVSReliability

Solution Approach 1:

The patent applies dynamics by transitioning from a fixed number of zero-subcarriers to a dynamic, adaptive selection mechanism. The system continuously monitors the disturbance ratio of impulsive noise and adjusts the number of zero-subcarriers in real-time, allowing the reconstruction quality to match the actual noise conditions while maintaining system reliability across varying environments.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter of zero-subcarrier count from a static value to a variable that adapts to noise conditions. By modifying this key parameter based on measured disturbance ratios, the system optimizes the balance between reconstruction accuracy and resource utilization, preventing both under-reconstruction and excessive bandwidth consumption.

Inventive Principle:
Principle #35Parameter changes

2Ease of operation

If a fixed number of zero-subcarriers is used to reconstruct impulsive noise, then the ease of operation is improved, but the productivity deteriorates when the disturbance ratio of impulsive noise is low

Engineering Contradiction:
Improveease of operationVSAvoidproductivity
Core Design Contradiction:
Ease of operationVSProductivity

Solution Approach 1:

The system dynamically adjusts the zero-subcarrier count based on actual noise conditions. When the disturbance ratio is low, the system reduces the number of zero-subcarriers, thereby increasing the bandwidth available for data transmission and improving overall productivity, while maintaining ease of operation through automated adaptation.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The patent modifies the zero-subcarrier parameter adaptively to optimize productivity. By reducing this parameter when noise levels are low, the system maximizes data throughput and spectral efficiency, directly improving productivity without requiring manual intervention.

Inventive Principle:
Principle #35Parameter changes

3Device complexity

If a fixed number of zero-subcarriers is used to reconstruct impulsive noise, then the device complexity is reduced, but the measurement precision deteriorates when the disturbance ratio of impulsive noise varies

Engineering Contradiction:
Improvedevice complexityVSAvoidmeasurement precision
Core Design Contradiction:
Device complexityVSMeasurement precision

Solution Approach 1:

The patent implements a dynamic measurement precision mechanism where the number of zero-subcarriers is adjusted according to the disturbance ratio. This ensures that measurement precision is high when noise is severe and appropriately reduced when noise is low, maintaining optimal reconstruction accuracy across varying conditions without requiring overly complex fixed-precision systems.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The system changes the measurement precision parameter (zero-subcarrier count) based on actual noise conditions. By adapting this parameter to match the disturbance ratio, the system achieves high measurement precision when needed while avoiding the waste of computational and spectral resources when precision requirements are lower.

Inventive Principle:
Principle #35Parameter changes

4Reliability

If the number of zero-subcarriers is increased to improve impulsive noise reconstruction accuracy, then the reliability is improved, but the productivity deteriorates due to bandwidth wastage

Engineering Contradiction:
ImprovereliabilityVSAvoidproductivity
Core Design Contradiction:
ReliabilityVSProductivity

Solution Approach 1:

The patent dynamically adjusts the zero-subcarrier parameter to optimize the trade-off between reliability and productivity. When the disturbance ratio is high, the system increases the zero-subcarrier count to improve reconstruction accuracy and reliability. When the disturbance ratio is low, it reduces the zero-subcarrier count to minimize bandwidth wastage and maximize productivity, achieving optimal performance in both scenarios.

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The system employs dynamic adaptation to balance reliability and productivity. By continuously monitoring noise conditions and adjusting the zero-subcarrier count accordingly, the system ensures high reliability when needed while maintaining high productivity during low-noise periods, avoiding the permanent trade-off inherent in fixed configurations.

Inventive Principle:
Principle #15Dynamics

5Productivity

If the number of zero-subcarriers is decreased to improve data throughput, then the productivity is improved, but the reliability deteriorates when the disturbance ratio of impulsive noise is high

Engineering Contradiction:
ImproveproductivityVSAvoidreliability
Core Design Contradiction:
ProductivityVSReliability

Solution Approach 1:

The patent adjusts the zero-subcarrier parameter dynamically based on disturbance ratio measurements. When the disturbance ratio is high, the system increases the zero-subcarrier count to ensure reliable noise reconstruction despite reduced data throughput. When the disturbance ratio is low, it decreases the zero-subcarrier count to maximize productivity, thus adapting to maintain reliability when necessary while improving productivity when possible.

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The system uses dynamic adaptation to balance productivity and reliability. By monitoring noise conditions and adjusting the zero-subcarrier count in real-time, the system ensures that productivity is maximized during low-noise periods while reliability is maintained during high-noise periods, avoiding the fixed trade-off of static configurations.

Inventive Principle:
Principle #15Dynamics

Data Source

PatentEP2629474B1Improvements relating to Adaptive Impulse Noise Mitigation
Publication Date: 2015.03.04 PACE PLC
  • EP2629474B1 patent drawingFigure 1
  • EP2629474B1 patent drawingFigure 2
  • EP2629474B1 patent drawingFigure 3

AI summary

A data transmission system and method is provided for the transmission data signal to one or receiving locations. A Multi Mode Compressive Sensing (MMCS) scheme is provided which adaptively changes the number of pilots used to reconstruct the Impulsive Noise (IN) depending on the IN's current severity so as to mitigate the same and stabilise the Bit Error Rate (BER) of the transmitted data signals and so improve the overall transmission system data throughput. The system can also allow for a variable IN mitigation range in order to allow the concurrent control of the BER and data throughput in the data transmission system.