Frequency Controller for Full-Duplex Echo Cancellation
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Solution Overview
Problem
Full-duplex communication systems face challenges in achieving optimal echo cancellation due to the dependence of echo cancellation performance on the phase between the transmitted and received signals, which is often arbitrary and suboptimal.
Innovation Solution
A communication device with a frequency controller that adjusts the frequency of the transmitted signal to set the phase between the transmitted and received signals in a way that facilitates optimal echo cancellation by the echo canceler.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If echo cancellation is performed in a full-duplex communication system, then the received signal quality is improved, but the cancellation performance is suboptimal due to arbitrary phase between TX and RX signals
Solution Approach 1:
The patent adjusts the frequency parameter of the transmitted signal to change the phase relationship between TX and RX signals. By modifying the frequency of the TX signal, the system achieves optimal phase alignment for echo cancellation without requiring complex hardware modifications.
Solution Approach 2:
The system implements a feedback mechanism where the echo canceler monitors the cancellation performance and provides information back to the frequency controller. This closed-loop control allows the system to continuously optimize the frequency adjustment to maintain optimal phase alignment for echo cancellation.
2Reliability
If the phase between TX and RX signals is adjusted for optimal echo cancellation, then echo component cancellation is improved, but the frequency control complexity increases
Solution Approach 1:
The frequency controller serves multiple functions: it not only adjusts the TX signal frequency for optimal echo cancellation but also maintains signal synchronization and adapts to varying channel conditions. This multi-functionality reduces the need for separate dedicated components.
Solution Approach 2:
The system uses the echo signal itself as the reference for frequency adjustment. The echo canceler processes the echo component and provides feedback that automatically guides the frequency controller to make the necessary adjustments, making the system self-regulating without external intervention.
Data Source
AI summary
A communication device includes a transmitter, a receiver, an echo canceler, and a frequency controller. The transmitter is to transmit a transmitted (TX) signal to a peer communication device over a full-duplex link. The receiver is to receive a received (RX) signal from the peer communication device over the full-duplex link. The echo canceler is to cancel an echo component of the TX signal that is present in the RX signal. The frequency controller is to apply an adjustment to a frequency of the TX signal, the adjustment setting a phase between the TX signal and the RX signal to a value that facilitates cancellation of the echo component by the echo canceler.