Self-Interference Cancellation for Shared Antenna Full-Duplex
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Solution Overview
Problem
Existing wireless full-duplex technologies using transmit/receive shared antennas struggle to effectively cancel self-interference signals due to their complex amplitude and phase changes, resulting in poor receive signal quality.
Innovation Solution
A method involving channel measurement timeslots to transmit reference signals, perform channel estimation, and generate self-interference signals for cancellation during data transmission timeslots, using a self-interference signal generation apparatus connected between the transmitter and receiver to accurately describe and cancel self-interference paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transmit/receive shared antenna is used for wireless full-duplex communication, then spectrum utilization is improved, but self-interference signal quality deteriorates
Solution Approach 1:
The patent segments the self-interference cancellation process into multiple independent components: channel estimation module, self-interference signal generation module, and cancellation module. Each module handles a specific aspect of the interference cancellation process, allowing for precise control and optimization of each segment while maintaining overall system performance.
Solution Approach 2:
The patent introduces a self-interference signal generation apparatus as an intermediary component between the transmitter and receiver. This intermediary generates a synthetic self-interference signal that mimics the actual interference, enabling precise cancellation without directly processing the strong transmit signal that would otherwise overwhelm the receiver.
2Device complexity
If simple amplitude attenuation and phase change are used for self-interference signal generation, then device complexity is reduced, but self-interference cancellation effectiveness deteriorates
Solution Approach 1:
The patent replaces simple mechanical signal processing components (attenuators and phase shifters) with a digital signal processing system. The self-interference signal generation apparatus uses digital channel estimation and signal synthesis to create an accurate model of the self-interference, substituting complex hardware manipulation with flexible software-based processing.
Solution Approach 2:
The patent changes the approach from adjusting physical parameters (amplitude and phase) of the transmit signal to dynamically calculating and synthesizing the self-interference signal based on channel state information. This parameter change enables precise control of the cancellation signal's characteristics to match the actual interference in both amplitude and phase.
Data Source
AI summary
Embodiments of the present invention provide a self-interference cancellation method, a transceiver, and a communications device for a transmit/receive shared antenna. The method includes: in a self-interference channel measurement timeslot, transmitting a first reference signal on a transmit channel, and receiving a second reference signal on a reference signal receive channel, where the second reference signal is a reference signal obtained after the first reference signal passes through a self-interference signal transmission path; and performing channel estimation according to the first reference signal and the second reference signal to obtain description information of the self-interference transmission path.