Adaptive SC-LDPC Decoder Parameters for Lower Delay and Power

Solution Overview

Problem

Decoding apparatuses for spatially coupled low-density parity-check codes often increase window size without considering error conditions, leading to increased processing delay and power consumption due to repetitive decoding iterations.

Innovation Solution

A decoding apparatus with a likelihood generation unit, error-correction decoder, error rate estimation unit, and decoding parameter control unit that dynamically adjusts window size and decoding iterations based on estimated error rates to optimize error correction performance and reduce power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the window size is increased by a predetermined amount after error occurrence in decoding processing, then error correction performance is improved, but processing delay and power consumption increase due to repetitive decoding iterations

Engineering Contradiction:

Improveerror correction performanceVSAvoidprocessing delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies dynamics by making the window size adjustable and adaptive rather than fixed. The decoding apparatus dynamically changes the window size based on the error rate of decoded data, allowing the system to adapt to varying channel conditions and minimize unnecessary repetitive decoding iterations, thereby reducing processing delay while maintaining error correction performance.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter (window size) based on the error rate condition. When the error rate exceeds a threshold, the window size is increased; when the error rate is within the threshold, the window size is maintained or reduced. This parameter adjustment prevents excessive error correction processing and reduces repetitive iterations, solving the contradiction between reliability and processing delay.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If the window size is increased by a predetermined amount after error occurrence in decoding processing, then error correction performance is improved, but power consumption increases due to repetitive decoding iterations

Engineering Contradiction:

Improveerror correction performanceVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent applies dynamics by making the window size adjustable and adaptive rather than fixed. The decoding apparatus dynamically changes the window size based on the error rate of decoded data, allowing the system to adapt to varying channel conditions and minimize unnecessary repetitive decoding iterations, thereby reducing processing delay while maintaining error correction performance.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter (window size) based on the error rate condition. When the error rate exceeds a threshold, the window size is increased; when the error rate is within the threshold, the window size is maintained or reduced. This parameter adjustment prevents excessive error correction processing and reduces repetitive iterations, solving the contradiction between reliability and processing delay.

Inventive Principle:

Principle #35Parameter changes

3Speed

If decoding is performed with fixed window size based on channel estimation, then initial decoding speed is maintained, but processing delay increases when errors persist requiring repeated iterations

Engineering Contradiction:

Improvedecoding speedVSAvoidprocessing delay

Core Design Contradiction:

SpeedVSLoss of time

Solution Approach 1:

The patent applies dynamics by making the window size adjustable and adaptive rather than fixed. The decoding apparatus dynamically changes the window size based on the error rate of decoded data, allowing the system to adapt to varying channel conditions and minimize unnecessary repetitive decoding iterations, thereby reducing processing delay while maintaining error correction performance.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter (window size) based on the error rate condition. When the error rate exceeds a threshold, the window size is increased; when the error rate is within the threshold, the window size is maintained or reduced. This parameter adjustment prevents excessive error correction processing and reduces repetitive iterations, solving the contradiction between reliability and processing delay.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentEP3972134B1Iterative decoder with adaptive decoding parameters for spatially coupled LDPC codes

Publication Date: 2023.11.15 MITSUBISHI ELECTRIC CORP

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AI summary

A decoder (1) that is a decoding apparatus includes an error-correction decoder (12) that executes error correction decoding processing of iteratively performing decoding processing with a window size and the number of decoding iterations indicated by decoding parameters, on received data converted into a spatially coupled low-density parity-check code, and a decoding parameter control unit (14) that updates the decoding parameters on the basis of a decoding result obtained by the iteratively executed decoding processing.