Software RF Cancellation for Full-Duplex Interference
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Solution Overview
Problem
Full-duplex RF communication systems face interference challenges due to signal leakage and distortion, which traditional hardware-based cancellation methods fail to adequately address, leading to inefficient data transmission and complex system designs.
Innovation Solution
A dual loop digital adaptive filter system is employed, using high-speed analog-to-digital converters and software-controlled processors to time- and phase-align the transmitted signal with the corrupted received signal, estimating and subtracting crosstalk components to generate a cancelled signal, thereby controlling filter weights for effective interference cancellation without requiring frequency-, time-, or code-division multiplexing or hardware RF cancellers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If hardware RF cancellers are used to cancel transmitted signal interference, then signal interference is reduced, but device complexity increases and adequate canceling is not achieved
Solution Approach 1:
The patent replaces hardware-based RF cancellers with a software-based digital signal processing system. The digital signal processor implements adaptive filtering algorithms that dynamically cancel interference signals, eliminating the need for complex hardware cancellation circuits while achieving superior canceling performance.
Solution Approach 2:
The system dynamically adjusts filter parameters and weights in real-time based on the characteristics of the transmitted and received signals. This adaptive parameter adjustment allows the software canceller to effectively track and cancel interference across varying signal conditions, achieving adequate canceling that hardware systems cannot provide.
2Productivity
If full-duplex techniques are used to transmit and receive signals simultaneously, then data bandwidth is increased, but signal interference from transmitted signal leakage increases
Solution Approach 1:
The system employs feedback mechanisms where the digital signal processor continuously monitors the received signal, identifies interference components from the transmitted signal, and adjusts the cancellation filter weights accordingly. This closed-loop feedback enables real-time interference cancellation, allowing full-duplex operation with high data bandwidth while maintaining signal quality despite transmitted signal leakage.
3Object-affected harmful factors
If multiple cancellation filters are used to achieve adequate interference cancellation, then signal cancellation performance is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple cancellation filter functions into a single integrated digital signal processing system. The DSP implements adaptive filtering algorithms that perform the work of multiple hardware filters through software, achieving equivalent or superior cancellation performance with a unified, flexible platform that reduces overall system complexity.
Data Source
AI summary
A full-duplex RF communication system and corresponding methods use digital adaptive filters for interference cancellation. As provided, the techniques allow full-duplex radio frequency communication without frequency-, time-, or code-division multiplexing and without the use of hardware RF cancellers. Such techniques may be useful for wireless communication, such as cellular communication, radio communication, broadcasting, short-range point-to-point communication, wireless sensor networks, and wireless computer networks.