Dummy Driver Echo Cancellation in Full-Duplex Transceivers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Full-duplex communication systems face challenges in echo cancellation, particularly in high-speed and long-cable applications, where residual errors increase, leading to errors in the extracted signal.
Innovation Solution
The implementation of a full-duplex transceiver with an integrated circuit package that includes a dummy driver replicating the signal path of a main driver, using conductive elements and passive circuit elements to generate a duplicated signal that matches the main signal, thereby reducing errors through echo cancellation and impedance matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional echo cancellation schemes are used in full-duplex transceivers, then the system can transmit signals in both directions simultaneously, but residual cancellation errors remain pronounced especially in high-speed and long-cable applications
Solution Approach 1:
The patent creates a dummy driver that replicates the electrical characteristics and signal path of the main driver. This copy includes matching output impedance, signal swing, and propagation delay to generate an accurate echo model for cancellation purposes, thereby improving echo cancellation accuracy in high-speed and long-cable applications
Solution Approach 2:
The patent introduces a dummy driver as an intermediary component between the main driver and the echo cancellation circuit. This intermediary generates a duplicate signal that represents the actual transmitted signal more accurately, enabling better echo estimation and cancellation without affecting the primary communication function
2Measurement precision
If a dummy driver is added to replicate the main driver signal path, then echo cancellation accuracy improves, but device complexity increases
Solution Approach 1:
The dummy driver is designed with homogeneous electrical characteristics matching the main driver, including output impedance, signal swing, and propagation delay. This homogeneity allows the dummy driver to accurately replicate the main driver's behavior without requiring complex adaptive adjustment circuits, thereby improving echo cancellation while limiting complexity increase
Data Source
AI summary
Embodiments relate to enhancing echo cancellation in a transceiver integrated circuit (IC) for full-duplex communication by providing a signal path connected to a dummy driver that replicates a signal path between a main driver and a counterpart transceiver IC to cause a duplicated signal generated by the dummy driver to more closely replicate a sending signal generated by the main driver. The signal path connected to the dummy driver includes circuit elements having transmission line parameters and RLC parameters that replicate transmission line parameters and RLC parameters of circuit elements in the signal path between the main driver and the counterpart transceiver IC.