Transceiver Interference Suppression via Switch Toggling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing communication systems face performance degradation due to interfering signals from transmitters, which current echo cancellation methods struggle to effectively suppress, especially in full duplex modes where both upstream and downstream signals are transmitted simultaneously.
Innovation Solution
A transceiver system with a configurable switch and processor that selectively connects or disconnects upstream signals to estimate and apply a filter response function for interference suppression, reducing complexity and training time by emulating interference channels and applying suppression filters efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full duplex mode is implemented to transmit upstream and downstream signals simultaneously, then spectral efficiency is improved, but receiver performance degrades due to interfering signals
Solution Approach 1:
The patent segments the upstream signal path by using a configurable switch to selectively connect or disconnect the upstream signal at different phases. During interference suppression filter estimation, the switch disconnects the upstream signal to isolate interference sources. During normal operation, the switch connects the upstream signal to enable full duplex communication. This segmentation allows the system to achieve both high spectral efficiency and reliable receiver performance.
2Reliability
If echo cancellation is applied to suppress interfering signals, then receiver performance is improved, but system complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-estimating the interference suppression filter response function before full duplex operation begins. The processor estimates the filter response function by monitoring the upstream signal during a training phase when the configurable switch is in specific positions. This preliminary estimation simplifies the subsequent echo cancellation process, reducing system complexity while maintaining receiver performance.
Solution Approach 2:
The patent implements feedback by using the monitored upstream signal to continuously refine the filter response function estimation. The processor analyzes the upstream signal characteristics and adjusts the filter parameters accordingly. This feedback mechanism enables effective interference suppression without requiring complex real-time processing during normal operation.
3Reliability
If filter response function estimation is performed continuously to maintain interference suppression accuracy, then receiver performance is improved, but training time and processing overhead increase
Solution Approach 1:
The patent applies periodic action by performing filter response function estimation at specific intervals rather than continuously. The configurable switch toggles between connection and disconnection states at predetermined phases to facilitate filter estimation. During normal operation, the pre-estimated filter is applied without continuous re-estimation, reducing training time while maintaining adequate interference suppression accuracy.
Data Source
AI summary
A transceiver includes a transmission chain, a reception chain, an interference suppression module and a processor. The transmission chain transmits a downstream signal to a communication network. The reception chain receives an upstream signal including (i) upstream transmissions originating by client devices, and (ii) an interference signal created by leakage and reflections of the downstream signal. The reception chain includes a configurable switch for connecting or disconnecting the upstream signal. The interference suppression module applies to the downstream signal a filter response function for generating an interference suppression signal to be subtracted from the upstream signal at a selected suppression point. The processor estimates the filter response function by monitoring the upstream signal while toggling the switch to connect and disconnect the upstream signal, and, sets the switch to connect the upstream signal and configures the interference suppression module to apply the filter response function to the downstream signal.