Adaptive Equalizer Gain Adjustment for Variable Cable Attenuation
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Solution Overview
Problem
Conventional equalizers face compatibility issues when compensating for signal attenuation caused by different transmission distances, as they use fixed settings that are not suitable for varying lengths of cables, and adaptive equalizers struggle without a test sequence to determine optimal parameter settings.
Innovation Solution
A method for adjusting adaptive equalizer parameters by detecting signal strengths across different frequency bands, comparing these strengths to determine a compensation ratio, and dynamically adjusting the equalizer settings to maintain a constant sum of signal and equalizer gains across frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional equalizer uses fixed parameter settings, then the device complexity is reduced, but the adaptability to different transmission distances deteriorates
Solution Approach 1:
The equalizer transitions from fixed static parameters to dynamic adaptive parameters that automatically adjust based on received signal characteristics. The system detects signal strengths across frequency bands and dynamically modifies equalizer coefficients to optimize performance for varying transmission conditions without requiring manual reconfiguration.
Solution Approach 2:
The equalizer performs self-adjustment by detecting its own received signal quality and automatically modifying its parameters. Through signal strength detection and comparison across frequency bands, the system autonomously determines optimal equalizer settings without external intervention or test sequences from the transmitting end.
2Measurement precision
If an adaptive equalizer uses test sequence for parameter adjustment, then the measurement precision is improved, but the ease of operation deteriorates
Solution Approach 1:
The invention extracts the parameter adjustment function from the transmitting end to the receiving end. Instead of requiring the transmitter to send test sequences for the receiver to measure and report back, the receiving equalizer independently performs signal detection and parameter optimization, eliminating the need for complex two-way communication for calibration.
Solution Approach 2:
The equalizer performs preliminary signal detection and parameter optimization using the actual received data signal itself, rather than waiting for separate test sequences. By continuously monitoring signal strengths during normal operation and adjusting parameters in real-time, the system achieves adaptive optimization without disrupting data transmission.
3Ease of operation
If the equalizer uses same settings for different transmission distances, then the ease of operation is improved, but the manufacturing precision deteriorates
Solution Approach 1:
The equalizer applies different compensation characteristics to different frequency bands based on local signal conditions. By detecting signal strengths in specific frequency ranges and adjusting equalizer coefficients accordingly, the system provides localized optimization for each frequency band rather than applying uniform settings across the entire spectrum.
Data Source
AI summary
A method for adjusting parameters of an adaptive equalizer makes use of a transmitted signal received by a receiving end to adjust parameters of an adaptive equalizer. First, signal strengths of a first frequency band and a second frequency band in the transmitted signal are detected. The signal strengths of the first frequency band and the second frequency band are then compared to get a compensation ratio, i.e., the total compensation quantity of the first frequency band to the second frequency band. Finally, the parameter setting of the equalizer is adjusted according to feedback of the compensation ratio. Optimum gain control of the adaptive equalizer can thus be accomplished to compensate signal attenuation to the transmitted signal caused by the channel.