Dynamic Transmitter Equalizer for Inter-Symbol Interference
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Solution Overview
Problem
In transmission systems, external interference and cross-talk lead to inaccurate data decoding by receivers, causing retransmissions and performance slowdowns due to misinterpretation of logic bits.
Innovation Solution
A dynamic equalizer in the transmitter adjusts filter coefficients from a default setting to a second set upon detecting a single different symbol following a series of common consecutive symbols, ensuring accurate interpretation of symbols by modifying the weighting of current and previous symbols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a receiver uses fixed filter coefficients to decode signals, then the device complexity is low, but the measurement precision of symbol detection deteriorates due to inter-symbol interference from external interference and cross-talk
Solution Approach 1:
The patent implements a dynamic equalizer that automatically adjusts filter coefficients based on detected signal conditions. The equalizer transitions from a static coefficient system to a dynamic one where coefficients are modified in real-time based on inter-symbol interference detection, thereby improving symbol detection accuracy without requiring manual intervention or complex fixed-structure designs
Solution Approach 2:
The patent changes the filter coefficients parameter of the equalizer dynamically based on detected signal conditions. When inter-symbol interference is detected, the system modifies the coefficient values to optimize symbol detection, directly addressing the measurement precision issue while maintaining manageable device complexity through automated parameter adjustment
2Measurement precision
If the transmitter uses dynamic filter coefficient adjustment to improve symbol detection accuracy, then the measurement precision improves, but the device complexity increases due to additional equalizer control mechanisms
Solution Approach 1:
The patent implements a feedback mechanism where the receiver detects symbol detection accuracy and sends information back to the transmitter. The transmitter's equalizer uses this feedback to automatically adjust its filter coefficients, creating a closed-loop system that improves precision while distributing the complexity burden across both transmitter and receiver rather than concentrating it in one location
Solution Approach 2:
The equalizer system performs self-adjustment based on detected signal conditions. The transmitter monitors its own transmission quality and automatically modifies its equalizer coefficients without external intervention, enabling the system to maintain high detection accuracy while keeping the control mechanism relatively simple through autonomous operation
3Reliability
If the receiver resends data upon detecting decoding errors, then the reliability of data transmission improves, but the productivity of the system deteriorates due to retransmissions slowing down performance
Solution Approach 1:
The patent applies preliminary action by proactively adjusting equalizer coefficients before decoding errors occur. The system detects early signs of inter-symbol interference and modifies its filtering parameters in advance, preventing decoding errors before they happen and thereby eliminating the need for retransmissions that would reduce system throughput
Solution Approach 2:
The patent applies preliminary anti-action by counteracting inter-symbol interference effects before they cause decoding errors. The dynamic equalizer preemptively adjusts its coefficients to compensate for anticipated interference patterns, neutralizing the harmful effects before they can corrupt the data and trigger reliability-correcting retransmissions
Data Source
AI summary
A method for filtering a signal having a series of symbols to be transmitted using the default coefficients, detecting occurrence of a series of consecutive common symbols followed by a different symbol in the series of symbols and based on detecting the occurrence, changing from the default coefficients to a second set of coefficients.