Decision Feedback Equalizer Coefficient Limiting for RF Interference Mitigation
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Solution Overview
Problem
Communication devices face performance degradation due to excessive RF interference, which is not adequately compensated for by existing compensation circuits, leading to decision errors and potential disconnection between transmitter and receiver.
Innovation Solution
A signal processing device with a decision feedback equalizer and a coefficient adjusting circuit that adaptively adjusts coefficients and applies a limit operation to weaken the frequency response of the equalizer in specific frequency ranges, either in time or frequency domains, to mitigate RF interference effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the receiver circuit amplifies the received signal to improve signal strength, then the signal quality is improved, but the RF interference is also amplified causing excessive voltage shift and decision errors
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the equalizer coefficients based on detected voltage shifts. The coefficient adjusting circuit modifies the equalization parameters in response to RF interference conditions, changing the frequency response to compensate for voltage shifts and reduce the amplification of interference while maintaining signal quality.
2Measurement precision
If the equalizer frequency response is strengthened to improve signal recovery, then the voltage shift compensation is improved, but the RF interference amplification becomes excessive causing misjudgment
Solution Approach 1:
The patent implements dynamics by making the equalizer frequency response adaptive rather than fixed. The coefficient adjusting circuit continuously modifies the equalizer coefficients based on real-time detection of voltage shifts, allowing the system to dynamically balance between compensating for signal degradation and avoiding excessive amplification of RF interference that would cause decision errors.
3Manufacturing precision
If the compensation circuit parameters are trained in controlled environment to optimize performance, then the parameter accuracy is improved, but the real-world RF interference conditions are not accounted for
Solution Approach 1:
The patent applies feedback by implementing a closed-loop system where the coefficient adjusting circuit continuously monitors the output of the equalizer and detects voltage shifts caused by RF interference. Based on this feedback, the system automatically adjusts the equalizer coefficients to maintain optimal performance in real-world conditions, bridging the gap between controlled environment training and actual deployment.
Data Source
AI summary
A signal processing device includes a decision feedback equalizer and a coefficient adjusting circuit. The decision feedback equalizer includes a first equalizer configured to perform filtering on a first signal according to a set of first coefficients to generate a first filtered signal. The set of first coefficients includes multiple first coefficients. The coefficient adjusting circuit is configured to adaptively adjust one or more of the first coefficients according to an error signal. A limit operation of the first coefficients is selectively performed. When the limit operation of the first coefficients is performed, at least one of the first coefficients is set to a first predetermined value to generate a set of limited first coefficients.