FIR Filter Tap Weight Adjustment via Feedback
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Solution Overview
Problem
Existing technologies cannot perform real-time continuous optimization of finite impulse response (FIR) filter settings in high-speed data communication systems due to variations in temperature and humidity, leading to inadequate signal equalization.
Innovation Solution
A method and apparatus that utilize a feedback module and adaptation module to adjust tap weights of the FIR filter based on error information extracted from the received differential signal, using a dedicated pair of reference samplers and an adaptation module to adapt reference voltages, thereby maintaining optimal equalization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If pre-determined FIR filter settings are used, then device complexity is reduced and ease of operation is improved, but signal equalization quality deteriorates due to temperature and humidity variations
Solution Approach 1:
The patent implements a feedback mechanism where the receiver continuously monitors signal quality metrics (such as eye diagram measurements or bit error rate) and communicates channel condition information back to the transmitter. Based on this feedback, the FIR filter coefficients are dynamically adjusted to maintain optimal signal equalization despite environmental variations.
Solution Approach 2:
The patent transitions from static pre-determined FIR filter settings to dynamic adaptive settings. The filter coefficients are continuously updated in real-time based on changing channel conditions caused by temperature and humidity variations, allowing the system to adapt to environmental changes while maintaining signal quality.
2Reliability
If real-time continuous optimization of FIR filter settings is implemented, then signal equalization quality is improved, but device complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the receiver continuously monitors signal quality metrics (such as eye diagram measurements or bit error rate) and communicates channel condition information back to the transmitter. Based on this feedback, the FIR filter coefficients are dynamically adjusted to maintain optimal signal equalization despite environmental variations.
Solution Approach 2:
The system performs self-adjustment through automated feedback loops where the receiver measures channel conditions and triggers coefficient updates without manual intervention. The FIR filter adaptation is managed autonomously by the communication system itself, reducing the need for external calibration or complex manual configuration.
3Ease of manufacture
If pre-set FIR filter settings are used, then ease of manufacture is improved, but adaptability to environmental variations deteriorates
Solution Approach 1:
The patent transitions from static pre-determined FIR filter settings to dynamic adaptive settings. The filter coefficients are continuously updated in real-time based on changing channel conditions caused by temperature and humidity variations, allowing the system to adapt to environmental changes while maintaining signal quality.
Solution Approach 2:
The patent dynamically changes the parameters (coefficients) of the FIR filter based on environmental conditions. By monitoring temperature and humidity sensors and adjusting the filter coefficients accordingly, the system maintains optimal performance across varying environmental conditions without requiring physical reconfiguration.
Data Source
AI summary
A feedback module is defined to receive as input a set of data sample signals and a set of reference sample signals. Each of the data and reference sample signals is generated by sampling a differential signal having been transmitted through a FIR filter. The feedback module is defined to operate a respective post cursor counter for each post cursor of the FIR filter and update the post cursor counters based on the received sets of data and reference sample signals. Also, the feedback module is defined to generate a tap weight adjustment signal for a given tap weight of the FIR filter when a magnitude of a post cursor counter corresponding to the given tap weight is greater than or equal to a threshold value. An adaptation module is defined to adapt a reference voltage used to generate the reference sample signals to a condition of the differential signal.