Transmitter Phase Control for Nonlinear Distortion in Full Duplex Systems
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Solution Overview
Problem
Echo cancel based full duplex transmission systems experience performance degradation due to nonlinear distortion introduced by class AB line drivers, which conventional echo cancellers cannot effectively suppress, leading to substantial errors in signal reception.
Innovation Solution
Implementing a phase delay control mechanism between the transmitter and receiver phases in a slave node, synchronized with a master node using a loop timing scheme, to adjust the transmitter phase relative to the receiver phase, thereby reducing nonlinear distortion below a threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional echo cancellers are used in full duplex transmission systems, then echo cancellation is provided, but nonlinear distortion from class AB line drivers cannot be effectively suppressed, leading to signal reception errors
Solution Approach 1:
The patent applies parameter changes by adjusting the phase relationship between transmitted and received signals. Specifically, it controls the transmitter phase relative to the receiver phase to transform the nonlinear distortion into a form that falls below the echo canceller's suppression threshold, thereby improving signal reception quality without adding complex distortion cancellation mechanisms
2Reliability
If phase delay control is implemented to reduce nonlinear distortion, then signal quality improves, but system complexity increases
Solution Approach 1:
The patent implements dynamics by making the phase delay adjustable rather than fixed. The phase delay control mechanism dynamically adapts the transmitter phase relative to the receiver phase based on system conditions, allowing the system to optimize distortion suppression while managing complexity through adaptive rather than static control
Solution Approach 2:
The patent employs feedback by monitoring the distortion level and using this information to adjust the phase delay. The system detects when distortion exceeds the threshold and automatically modifies the phase relationship to bring distortion back within acceptable limits, creating a closed-loop control system that manages complexity through intelligent adaptation
Data Source
AI summary
A network component comprising a transmitter configured to transmit data at a transmitter phase, a receiver configured to receive data at a receiver, and a phase delay component coupled to the transmitter and the receiver and configured to control the transmitter phase relative to the receiver phase to maintain distortion in the transmitted data below a threshold, wherein the threshold is less than a maximum possible distortion in the transmitted data.