Input BER Estimation Using Post-Decoding Error Ratios
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Solution Overview
Problem
Conventional methods for estimating the input bit error ratio in digital transmission systems are inaccurate when the bit error rate (BER) is 1E-3 or larger.
Innovation Solution
A method and device that determine conditions based on post-decoding residual error detection ratios to select appropriate processing procedures for estimating the input BER, utilizing error correction codes like LDPC codes for accurate estimation even at high BER values such as 1E-2.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional BIP-based estimation method is used, then the method is simple to implement, but the input BER estimation accuracy deteriorates when input BER is 1E-3 or larger
Solution Approach 1:
The patent implements dynamic selection of estimation methods based on operating conditions. The post-decoding residual error detection ratio serves as a dynamic parameter to determine which estimation procedure to use: when the ratio indicates low error conditions, a first estimation method is applied; when it indicates high error conditions, a second estimation method is applied. This dynamic adaptation resolves the contradiction by optimizing accuracy for each specific operating regime without requiring a single complex method to handle all cases.
Solution Approach 2:
The patent changes the estimation approach based on the value of the post-decoding residual error detection ratio. By monitoring this parameter and switching between different estimation procedures according to its value, the system achieves high accuracy across different BER ranges. The parameter change principle allows the system to adapt its estimation strategy to match the actual error conditions, resolving the accuracy limitation of conventional fixed methods.
2Measurement precision
If a single fixed estimation procedure is used, then the device complexity is low, but the estimation accuracy cannot be maintained across different BER ranges
Solution Approach 1:
The patent segments the estimation process into multiple distinct procedures based on operating conditions. Instead of using a single fixed procedure, the system divides the estimation task into at least two different procedures: one optimized for low BER conditions and another for high BER conditions. The post-decoding residual error detection ratio determines which segment (procedure) to execute. This segmentation resolves the contradiction by allowing each procedure to be optimized for its specific range while keeping individual procedure complexity manageable.
Solution Approach 2:
The system dynamically selects which estimation procedure to execute based on the measured post-decoding residual error detection ratio. This dynamic selection mechanism allows the system to adapt to changing error conditions and switch between appropriately optimized procedures, achieving high accuracy across the full range of BER values without requiring all procedures to run simultaneously, thus managing overall complexity effectively.
Data Source
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AI summary
An input bit error ratio estimating method executed by a communication control unit includes a computing step (ST1), a condition determining step (ST2), a first input BER estimating step (ST3), a second input BER estimating step (ST4), a third input BER estimating step (ST5), and an input BER estimation result outputting step (ST6). In the condition determining step (ST2), the communication control unit determines which of a plurality of conditions (A to C) set in advance to be narrowed down to one has been established, based on a post-internal decoding residual error detection ratio (Dr). Based on the condition that is determined in the condition determining step (ST2) as one that has been established, the communication control unit selects one out of a plurality of processing procedures for estimating the input BER, namely, processing of the step (ST3) to processing of the step (ST5), and executes the selected processing.