Adaptive Echo Cancellation Filter with Dynamic Tap Adjustment
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Solution Overview
Problem
Conventional echo cancellers in high-speed serial communication systems require a large number of filter taps and delay elements to handle varying channel impulse responses, leading to increased silicon area, power consumption, and limited clock speed.
Innovation Solution
An adaptive filter system that monitors filter coefficients and echo cancellation errors to adjust delay elements and filter taps dynamically, enabling efficient tuning of the impulse response to match changing channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of filter taps and delay elements is increased to handle varying channel impulse responses, then the adaptability to different channel conditions is improved, but the silicon area and power consumption increase
Solution Approach 1:
The patent implements dynamic adjustment of the filter structure by enabling or disabling delay elements and filter taps based on real-time monitoring of echo cancellation error. The filter transitions from a static over-dimensioned design to a dynamic configuration that adapts its complexity to current channel conditions, reducing power consumption when full adaptability is not required.
Solution Approach 2:
The patent changes the operational parameters of the filter by adjusting the number of active delay elements and filter taps based on monitored performance metrics. When echo cancellation error falls within an acceptable range, the system reduces the number of active filter components, thereby changing the power consumption parameter while maintaining adequate echo cancellation performance.
2Adaptability or versatility
If the number of filter taps and delay elements is increased to handle varying channel impulse responses, then the adaptability to different channel conditions is improved, but the silicon area increases
Solution Approach 1:
The patent implements dynamic adjustment of the filter structure by enabling or disabling delay elements and filter taps based on real-time monitoring of echo cancellation error. The filter transitions from a static over-dimensioned design to a dynamic configuration that adapts its complexity to current channel conditions, reducing silicon area utilization when full adaptability is not required.
3Adaptability or versatility
If the number of filter taps and delay elements is increased to handle varying channel impulse responses, then the adaptability to different channel conditions is improved, but the clock speed is limited
Solution Approach 1:
The patent implements dynamic adjustment of the filter structure by enabling or disabling delay elements and filter taps based on real-time monitoring of echo cancellation error. The filter transitions from a static over-dimensioned design to a dynamic configuration that adapts its complexity to current channel conditions, reducing the computational burden and allowing for higher clock speeds when full filter capacity is not required.
4Reliability
If the filter is dimensioned for the worst channel condition, then the reliability under all conditions is improved, but the power consumption and silicon area increase
Solution Approach 1:
The patent employs feedback mechanisms by continuously monitoring echo cancellation error and using this information to adjust the filter configuration. This closed-loop control ensures reliability under varying conditions while optimizing power consumption, as the filter only uses the necessary number of taps and delay elements required for current channel conditions rather than maintaining maximum capacity constantly.
Data Source
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AI summary
Systems and methods for operating a filter for echo cancellation are described. In one embodiment, a method for operating a filter for echo cancellation involves monitoring at least one of a filter coefficient of the filter and an echo cancellation error to generate a monitoring result and, in response to the monitoring result, adjusting at least one of delay elements and filter taps of the filter to vary an impulse response of the filter. Other embodiments are also described.