Multicarrier Reception Weighting for Interference-Affected Sub-Carriers

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Solution Overview

Problem

Current multicarrier wireless communication systems face challenges in improving frequency utilization efficiency in low D/U environments and require complex configurations to handle interference waves, leading to increased delay and error rates due to the need for interference replica calculation and modulation method recognition.

Innovation Solution

A reception method and device that utilize forward error correction codes, employing interference band detection, weight coefficient generation, weighted calculation, and permutation processes to reduce reception errors by identifying and mitigating interference in sub-carriers, regardless of the power ratio between desired and interference waves.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If multistage interference cancellation method is used to improve error correction in low D/U environments, then reception reliability is improved, but device complexity and calculation delay increase

Engineering Contradiction:

Improvereception reliabilityVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent segments the interference cancellation process by identifying specific sub-carriers affected by interference and applying targeted weight coefficients only to those sub-carriers, rather than processing all sub-carriers uniformly. This segmentation reduces the computational burden and device complexity while maintaining reception reliability in low D/U environments.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies local quality by generating weight coefficients specifically for sub-carriers identified as being affected by interference. Instead of uniform processing, the system adapts the weighting locally to each affected sub-carrier based on its specific interference conditions, thereby improving reception reliability without requiring complex global processing.

Inventive Principle:

Principle #3Local quality

2Reliability

If multistage interference cancellation method is used to improve error correction in low D/U environments, then reception reliability is improved, but calculation delay increases

Engineering Contradiction:

Improvereception reliabilityVSAvoidcalculation delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent reduces calculation delay by segmenting the interference cancellation process to only those sub-carriers affected by interference. By identifying specific interfering sub-carriers and applying weight coefficients only to them, the system avoids unnecessary calculations on non-interfered sub-carriers, thereby reducing overall calculation delay while maintaining reception reliability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies partial action by performing interference cancellation only on the necessary subset of sub-carriers that are actually affected by interference, rather than processing all sub-carriers. This partial processing approach reduces calculation delay while still achieving the required reception reliability for the affected portions of the signal.

Inventive Principle:

Principle #16Partial or excessive action

3Productivity

If frequency scheduling is used to improve frequency utilization efficiency, then frequency utilization efficiency is improved, but reception reliability in low D/U environments deteriorates

Engineering Contradiction:

Improvefrequency utilization efficiencyVSAvoidreception reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies local quality by generating specific weight coefficients for each sub-carrier affected by interference. This localized adaptation allows the system to maintain high frequency utilization efficiency through scheduling while simultaneously improving reception reliability by compensating for interference on a per-sub-carrier basis in low D/U environments.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes the parameter of sub-carrier reliability by introducing weight coefficients that modify the effective reliability of each sub-carrier based on its interference conditions. This parameter change allows the system to maintain high frequency utilization efficiency while improving reception reliability by adjusting the weight parameters for affected sub-carriers.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20110107171A1Reception method and reception device

Publication Date: 2011.05.05 NIPPON TELEGRAPH & TELEPHONE CORP

AI summary

In a multicarrier wireless communication system adopting forward error correction codes, a reception method adapted to a receiver 1 receiving wireless signals is constituted of an interference band detection process for selecting a sub-carrier having low reliability among a plurality of sub-carriers of desired waves as a specific sub-carrier, a weight coefficient generation process for generating weight coefficients for reducing reliability in sub-carriers with respect to the selected specific sub-carrier, a demodulation process for demodulating received wireless signals of sub-carriers, a weighted calculation process for performing weighted calculation applying weight coefficients to demodulated values of sub-carriers of wireless signals, and a decoding process for performing a decoding process for error correction on values calculated of sub-carriers.