Timing Dependence Cancellation Module for MLT-3 Echo Convergence
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Solution Overview
Problem
Conventional echo cancellers fail to effectively reduce echo amplitudes in communication systems using the multi-level transmit-3 (MLT-3) protocol due to timing dependence between transmission signals, which prevents convergence of frequency response and subsequent echo reduction.
Innovation Solution
A communication system and method that incorporates a first timing dependence cancellation module to generate an echo integral signal, an echo cancellation module to produce an echo simulation signal, and a data path module to generate a data signal, allowing for the cancellation of timing dependence within transmission signals, thereby enabling effective echo cancellation even with MLT-3 encoded signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the MLT-3 protocol is used for encoding transmission signals, then the communication system can achieve higher data rates, but timing dependence occurs between consecutive transmission signals which prevents echo canceller from converging
Solution Approach 1:
The patent introduces an intermediary component (timing dependence cancellation module) that processes the transmission signal to remove timing dependence before the signal reaches the echo canceller. This intermediary module analyzes the MLT-3 encoded signal and eliminates the timing correlation between consecutive signals, allowing the subsequent echo canceller to converge properly while maintaining the benefits of MLT-3 encoding for high data rates
2Device complexity
If transmission signals are sent on a single transmission line, then the system complexity is reduced, but reflected echoes become significant and degrade signal quality
Solution Approach 1:
The patent applies the principle of converting harm into benefit by taking the harmful reflected echoes and using them constructively. The echo canceller captures the reflected echoes, processes them through the timing dependence cancellation module, and then subtracts the processed echo signal from the received signal. This transforms the harmful echo interference into a controllable component that can be eliminated, thereby improving signal quality while maintaining the simplicity of single transmission line configuration
Data Source
AI summary
In a communication system, a timing-dependence cancelling module is included for cancelling timing-dependence of a transmission signal, so as to render a timing-dependent signal be capable of being utilized on communication systems. Besides, updating an echo cancelling parameter by applying an error difference variable and a data difference variable, or by directly decreasing a step-size coefficient, may also fulfill the purpose of reducing or eliminating timing dependence in a transmission signal of a communication system.