Full Duplex Self-Interference Channel Estimation and Cancellation
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Solution Overview
Problem
In wireless communication systems employing a full-duplex scheme, self-interference signals significantly degrade performance by overpowering desired signals, leading to ADC saturation and reduced resource efficiency due to simultaneous uplink and downlink transmission on the same frequency or time resource.
Innovation Solution
A method and device that identify a downlink signal-only transmission section, detect symbols with higher power values, estimate the interference channel, and process both transmission and reception in an FDX transmission section by removing self-interference signals, utilizing a processor and transceiver to manage signal processing and interference cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequency division or time division is used to prevent interference between uplink and downlink signals, then interference is prevented, but resource use efficiency is reduced
Solution Approach 1:
The patent segments the transmission process into two parts: first estimating the self-interference channel during downlink-only periods, then using this estimation to cancel self-interference during full-duplex periods. This segmentation allows the system to prepare interference cancellation parameters in advance, enabling efficient full-duplex operation without continuous interference issues.
Solution Approach 2:
The patent performs preliminary action by estimating the self-interference channel during downlink signal-only transmission sections before entering full-duplex mode. This advance preparation of channel estimation data enables the system to effectively cancel self-interference when full-duplex transmission begins, improving resource efficiency while maintaining signal quality.
2Productivity
If full-duplex transmission is used to enhance resource use efficiency, then resource use efficiency is improved, but self-interference signal occurs
Solution Approach 1:
The patent converts the harmful self-interference signal into a beneficial estimation opportunity. By deliberately measuring the self-interference channel during downlink-only sections when the interference pattern is known, the system creates accurate cancellation parameters that then eliminate the harmful effect during full-duplex operation, turning the harmful interference into a useful calibration mechanism.
Solution Approach 2:
The patent introduces an intermediary process of self-interference channel estimation that mediates between the transmitted signal and the received signal. This intermediary estimation acts as a reference model that allows the receiver to identify and remove self-interference components from the composite signal, enabling clean full-duplex communication.
3Productivity
If self-interference signal is present in full-duplex transmission, then simultaneous uplink and downlink transmission is enabled, but signal quality is degraded due to ADC saturation
Solution Approach 1:
The patent implements feedback by continuously estimating the self-interference channel during downlink sections and using this feedback information to cancel self-interference during full-duplex sections. This feedback loop ensures that the system adapts to changing interference conditions and maintains signal quality throughout full-duplex operation, preventing ADC saturation.
Data Source
AI summary
Disclosed are a method and a device for transmitting and receiving a signal, the method including: identifying a downlink signal-only transmission section in which a first electronic device transmits a downlink signal to a second electronic device, and transmitting the signal in the downlink signal-only transmission section; detecting at least one symbol that has a power value relatively higher than a predetermined threshold value; estimating, on the basis of the detected at least one symbol, an interference channel in which a self-interference signal occurs; detecting the self-interference signal; and identifying an FDX transmission section in which an uplink signal is received from the second electronic device and the downlink signal is transmitted simultaneously, and processing transmission of the downlink signal and reception of the uplink signal in the FDX transmission section, wherein the reception of the uplink signal is processed by removing the self-interference signal occurring in the interference channel.