Communication Quality Estimating Device for Post-FEC Error Rate
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Solution Overview
Problem
Existing communication systems face challenges in accurately estimating the bit error rate after error correction, particularly in PAM-4 communications, due to burst errors caused by high-level equalizers, which affects communication quality and requires inappropriate adjustment of communication parameters.
Innovation Solution
A communication quality estimating device that calculates frequency measurement values and determines transition and continuation probabilities to estimate the error rate of signals after error correction, using a processor to adjust communication parameters and improve signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high-level equalizer (decision feedback equalizer) is used to improve signal quality in PAM-4 communication, then signal quality is improved, but burst errors tend to occur
Solution Approach 1:
The patent applies preliminary action by measuring the frequency of codewords with m errors and using this measurement to determine transition and continuation probabilities in advance. These probabilities are then used to calculate the frequency of codewords with more than K errors before actual transmission occurs, enabling proactive estimation of post-FEC bit error rate without intentionally causing errors during operation.
Solution Approach 2:
The patent introduces an intermediary approach by using probability models (transition probability and continuation probability) as mediators between the measured error frequencies and the estimated post-FEC bit error rate. This intermediary statistical model allows accurate estimation without directly causing burst errors during communication.
2Reliability
If communication parameters are adjusted to ensure low post-FEC bit error rate, then communication quality is maintained, but accurate estimation of post-FEC bit error rate is difficult when burst errors occur
Solution Approach 1:
The patent implements feedback by using the measured frequency of codewords with m errors to update and refine the transition and continuation probabilities. This feedback loop allows the system to continuously improve the accuracy of post-FEC bit error rate estimation based on actual observed error patterns, enabling appropriate adjustment of communication parameters.
Solution Approach 2:
The patent replaces the mechanical approach of intentionally causing bit errors to measure post-FEC bit error rate with a statistical calculation method. Instead of physically inducing errors, the system uses probability models and mathematical calculations to estimate the post-FEC bit error rate, achieving the same measurement goal without the harmful side effects.
3Measurement precision
If intentional bit errors are caused to measure post-FEC bit error rate, then measurement is possible, but communication service operation is disrupted
Solution Approach 1:
The patent applies self-service by enabling the communication system to measure and estimate its own post-FEC bit error rate using normal transmission data without external intervention or intentional error injection. The system uses its own operational data (frequency of codewords with m errors) to perform self-diagnosis and self-adjustment, maintaining communication service continuity while achieving accurate measurement.
Data Source
AI summary
A communication quality estimating device estimates an error rate of a signal with FEC capable of correcting K errors. The device obtains a frequency measurement value that indicates a frequency at which a codeword including m errors is received. The device determines a transition probability and a continuation probability included in each of a plurality of formulae, such that a frequency calculation value that is calculated using the plurality of formulae and indicates a frequency at which a codeword including m errors is received is brought close to the frequency measurement value. The device calculates a frequency at which a codeword including more than K errors is received, by using the plurality of formulae each with the determined transition probability and the determined continuation probability. The device estimates after-FEC error rate based on a result of the calculation.