Echo Cancellation Tap Power Management in Automotive Transceivers
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Solution Overview
Problem
High-speed cable communication systems, particularly in automotive environments, face significant power consumption due to the implementation of interference cancellation and echo cancellation, which affects deployment in applications where power efficiency is crucial.
Innovation Solution
Implementing a power-saving management system that dynamically turns off unnecessary echo and interference cancellation taps based on pre-determined thresholds, using an echo cancellation filter and interference cancellation filter to minimize power consumption while maintaining effective signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If interference cancellation and echo cancellation are implemented in a digital signal processing based automotive transceiver, then EMI and echo performance requirements are met, but power consumption increases significantly
Solution Approach 1:
The patent implements dynamic power management for echo cancellation taps by continuously monitoring echo power levels and adjusting the number of active taps accordingly. When echo power exceeds a threshold, more taps are activated to improve cancellation performance; when echo power is low, fewer taps are needed, reducing power consumption. This dynamic adaptation resolves the contradiction between maintaining reliable echo cancellation and minimizing power usage.
Solution Approach 2:
The system changes the parameter of the number of active echo cancellation taps based on measured echo power conditions. By varying this parameter dynamically rather than maintaining a fixed number of taps, the system achieves both good echo cancellation performance when needed and low power consumption when echo conditions are favorable, thus resolving the technical contradiction.
2Reliability
If a large number of echo taps are maintained active to handle worst-case echo scenarios, then echo cancellation performance is improved, but power consumption increases
Solution Approach 1:
The patent employs dynamic adjustment of the number of active echo taps based on real-time echo power measurement. Instead of maintaining a fixed large number of taps to handle worst-case scenarios, the system activates only the necessary number of taps based on current echo conditions, achieving both performance and power efficiency.
Solution Approach 2:
The system applies partial action by activating only the minimum necessary number of echo taps required to achieve adequate cancellation performance for current echo conditions, rather than always maintaining excessive capacity. This resolves the contradiction by matching resource allocation to actual needs.
3Reliability
If echo cancellation is continuously active to handle varying echo conditions, then communication reliability is maintained, but power consumption increases
Solution Approach 1:
The patent implements continuous monitoring of echo power levels with dynamic adjustment of echo cancellation resources. The system maintains communication reliability by being ready to activate additional taps when echo conditions deteriorate, while conserving power by using fewer taps during low-echo periods. This dynamic approach resolves the contradiction between continuous reliability and intermittent power consumption.
Solution Approach 2:
The system uses feedback from echo power measurement to control the number of active echo cancellation taps. By continuously measuring echo power and adjusting tap activation accordingly, the system maintains reliable communication when needed while minimizing power consumption during normal operation, thus resolving the technical contradiction.
Data Source
AI summary
Embodiments described herein provide echo cancellation power saving management at a cable transceiver. An echo response signal having a first number of signal components is obtained, via an echo cancellation filter. At a first iteration for calculating a first accumulative echo power, a respective echo tap that corresponds to the first iteration is identified. The first accumulative echo power is calculated for the respective iteration by summing powers of outputs from a last echo tap to the respective echo tap. It is then determined whether the first accumulative echo power, exceeds a pre-determined echo power threshold. If the first accumulative echo power exceeds the pre-determined echo power threshold, a first turn-off indication is sent to the echo cancellation filter to turn off all echo taps including and between the last echo tap to the first echo tap.