Pattern Compensation Circuit for Biased DFE Data Streams
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Solution Overview
Problem
Decision feedback equalizers (DFE) fail to operate normally when the ratio of data patterns in a bit stream is biased, leading to signal distortion and consecutive errors due to uneven count values of data patterns, which affects the convergence of DFE coefficients and the accuracy of signal compensation.
Innovation Solution
A compensation circuit that analyzes the bit stream to count the coincidence of data patterns, generates compensation values to ensure even multiplication results, and adjusts DFE coefficients based on these values, thereby ensuring even pattern count distributions and accurate signal compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a decision feedback equalizer is used to compensate for signal distortion, then signal compensation accuracy is improved, but the system fails when data pattern ratio is biased
Solution Approach 1:
The patent applies preliminary action by counting data patterns and calculating compensation values before the DFE processes the signal. The compensation circuit pre-adjusts the data pattern distribution by generating compensation values based on counted patterns, ensuring even distribution before DFE coefficient convergence, thereby preventing DFE failure due to biased patterns.
2Productivity
If DFE coefficients are calculated based on biased data patterns, then processing speed is maintained, but convergence accuracy deteriorates
Solution Approach 1:
The patent introduces a compensation circuit as an intermediary between the data pattern input and the DFE coefficient calculation. This intermediary counts the data patterns, generates compensation values, and adjusts the pattern distribution before DFE processing, thereby improving convergence accuracy without significantly impacting processing speed.
3Productivity
If data pattern count distribution is uneven, then data processing continues without interruption, but consecutive errors occur
Solution Approach 1:
The patent implements feedback by continuously counting data patterns in the bit stream, comparing the count values to detect bias, and generating compensation values based on the detected pattern distribution. This closed-loop feedback mechanism adjusts the data pattern distribution in real-time, preventing consecutive errors while maintaining continuous data processing.
Data Source
AI summary
Disclosed is a compensation circuit which includes a data analyzer that receives a first bit stream including first to N-th bits, counts a number of times of coincidence of each of first to 2M-th patterns each having an M-bit size from the first bit stream, and generates a first pattern stream including first to 2M-th count values each corresponding to the number of times of coincidence of each of the first to 2M-th patterns, and a compensation calculator that determines first to 2M-th compensation values based on the first pattern stream such that results of multiplying the first to 2M-th count values and the first to 2M-th compensation values one-to-one are even. “N” is a natural number, and “M” is a natural number smaller than “N”.