Interference Cancellation Repeater Using Periodic Adaptive Filtering
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Solution Overview
Problem
Wireless repeaters face signal quality deterioration and system oscillation due to feedback interference signals, necessitating effective interference cancellation to preprocess and repeat only the original input signal.
Innovation Solution
An interference cancellation repeater is designed with a canceller, digital filter, interference signal detector, and adaptive filter to generate and filter interference-cancelled signals, detecting interference signal intervals and controlling filter coefficients to minimize noise and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous interference cancellation processing is performed, then interference cancellation performance is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic action by detecting interference signal intervals and performing interference cancellation processing only during detected interference periods rather than continuously. The adaptive filter generates estimated signals selectively based on interference signal existence intervals, enabling periodic operation that reduces power consumption while maintaining interference cancellation effectiveness during actual interference events.
2Reliability
If adaptive filter continuously generates estimated signal, then interference cancellation performance is improved, but noise generation increases
Solution Approach 1:
The patent applies periodic action by controlling the adaptive filter to generate estimated signals only during detected interference signal intervals. The interference signal detector identifies specific time intervals where interference exists, and the adaptive filter operates periodically only during these intervals rather than continuously, thereby reducing noise generation from unnecessary signal processing while maintaining cancellation performance during actual interference.
3Reliability
If full-bandwidth interference cancellation is performed, then interference cancellation performance is improved, but processing complexity increases
Solution Approach 1:
The patent implements segmentation by dividing the frequency spectrum into multiple bandwidths and performing interference cancellation processing separately for each bandwidth. The adaptive filter generates estimated signals for different frequency segments independently, allowing parallel processing that reduces overall processing complexity while maintaining comprehensive interference cancellation coverage across the entire spectrum.
Data Source
AI summary
An interference cancellation repeater configured to cancel an interference signal included in an input signal, the interference cancellation repeater including: a canceller configured to generate an interference canceled signal based on the input signal and an estimated signal; a digital filter configured to filter the interference canceled signal to generate an output signal; an interference signal detector configured to generate interference signal existence interval information using the input signal and the output signal; and an adaptive filter configured to receive the interference canceled signal and the output signal, and generate the estimated signal based on the interference signal existence interval information. Information of the signal existence section.