Full-Duplex Relay Self-Interference Suppression via Segmented Filtering
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Solution Overview
Problem
Full-duplex relays in wireless communication systems face significant performance limitations due to self-interference, which is not effectively addressed by existing methods without incurring spectral efficiency penalties or complexity drawbacks.
Innovation Solution
The implementation of receive and transmit suppression filtering in relays, using optimal filter matrices determined by the transmit, receive, and self-interference channel matrices, to suppress self-interference and enhance signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex operation is implemented in relays, then spectral efficiency is improved, but self-interference performance deteriorates
Solution Approach 1:
The patent segments the self-interference cancellation process into two distinct stages: receive suppression filtering (applied to the received signal before relay processing) and transmit suppression filtering (applied to the transmitted signal). This segmentation allows each filter to be optimized for its specific function, with the receive suppression filter addressing interference at the relay input and the transmit suppression filter addressing interference at the relay output, thereby effectively managing self-interference while maintaining full-duplex spectral efficiency
Solution Approach 2:
The receive suppression filter is applied preliminarily to the received signal before the relay performs its normal signal processing operations. By suppressing self-interference components in the received signal at an early stage, the filter prevents interference from propagating through subsequent processing stages, thereby protecting the relay's reception capability while enabling simultaneous transmission
2Object-affected harmful factors
If half-duplex mode is used in relays, then self-interference is reduced, but spectral efficiency deteriorates
Solution Approach 1:
The patent enables the relay to dynamically operate in full-duplex mode with active self-interference suppression, rather than being constrained to static half-duplex operation. The dynamic application of receive and transmit suppression filters allows the relay to simultaneously receive and transmit signals on the same frequency channel, achieving full-duplex spectral efficiency while actively managing self-interference through the filtering mechanisms
3Object-affected harmful factors
If suppression filtering is applied, then self-interference is reduced, but device complexity increases
Solution Approach 1:
The patent introduces suppression filters as intermediary components that mediate between the relay's transmit and receive paths. The receive suppression filter acts as an intermediary processing the received signal to remove self-interference components, while the transmit suppression filter intermediates the transmitted signal. These intermediary filters provide a systematic and modular approach to self-interference cancellation, integrating seamlessly into the relay's existing signal processing architecture without requiring fundamental redesign
Data Source
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AI summary
A method, and an apparatus, for self-interference suppression in a relay (300) for wireless communication, wherein the relay (300) is arranged for receiving a signal r(n) transmitted from a transmitter (301), and for transmitting a self-interference suppressed transmit signal x r (n) to a receiver (305). The self-interference suppressed transmit signal x r (n) is achieved by determining (402) a receive suppression filter matrix W r (302), determining a relay amplification matrix G (303), and determining (403) a transmit suppression filter matrix W t (304), and then applying the suppression filters and the amplification matrix to the received signal r(n).