Delay-Matched Analog Self-Interference Cancellation for Full-Duplex Transceivers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Full-duplex wireless communication systems face challenges with self-interference due to high variance in signal transmission and reception delays, limiting the effectiveness of existing analog self-interference cancellation methods.
Innovation Solution
A system for delay-matched analog self-interference cancellation, comprising a transmit coupler, a receive coupler, a delay matcher, and an analog self-interference canceller, which samples and processes the transmit signal to generate a delay-matched cancellation signal, effectively reducing self-interference by performing both fine and coarse delay adjustments without requiring multiple expensive circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional analog self-interference cancellation methods are used, then the system can operate in full-duplex mode, but the performance degrades due to high variance in signal transmission and reception delays
Solution Approach 1:
The patent implements dynamic delay adjustment mechanisms that adapt to varying propagation conditions. The system continuously monitors and adjusts delay parameters to match the actual time difference between transmitted and received signals, enabling reliable self-interference cancellation despite environmental changes and high delay variance.
Solution Approach 2:
The system changes key parameters including delay time, amplitude, and phase of the cancellation signal to optimize performance under different operating conditions. By dynamically adjusting these parameters based on measured channel conditions, the system maintains effective self-interference cancellation across varying delay scenarios.
2Measurement precision
If multiple circuits are used to achieve both fine and coarse delay adjustments, then the delay matching precision is improved, but the system complexity and cost increase
Solution Approach 1:
The patent combines fine and coarse delay adjustment functionalities into a single integrated delay matcher circuit. This unified approach eliminates the need for separate circuits for each adjustment type, reducing system complexity while maintaining the ability to achieve both precise fine-tuning and broader coarse adjustments through coordinated operation of the merged circuit.
Solution Approach 2:
The delay matcher circuit is designed to perform multiple functions: it provides both fine and coarse delay adjustments, adapts to varying delay conditions, and works across different operating scenarios. This multi-functional design eliminates the need for multiple specialized circuits, simplifying the overall system architecture.
Data Source
AI summary
A system for delay-matched analog self-interference cancellation including a transmit coupler, that samples the analog transmit signal to create a sampled analog transmit signal; a delay matcher that imposes a variable delay on the sampled analog transmit signal to create a delayed analog transmit signal; an analog self-interference canceller that transforms the delayed analog transmit signal to an analog self-interference cancellation signal; and a receive coupler, that combines the analog self-interference cancellation signal with the analog receive signal.