Adaptive Self-Interference Cancellation in Wireless Devices
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Solution Overview
Problem
Wireless communication devices face challenges in choosing between full-duplex and half-duplex modes due to self-interference issues, which can result in worse transmission performance in full-duplex mode compared to half-duplex mode, making it difficult to select the optimal communication mode.
Innovation Solution
A wireless communication device equipped with a self-interference cancellation circuit and a control circuit that enables adaptive operation between full-duplex and half-duplex modes based on self-interference, environment interference, operation capability, and power-saving demands, using both analog and digital self-interference cancellation signals to mitigate interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex mode is used to double throughput, then transmission efficiency is improved, but self-interference deteriorates transmission performance
Solution Approach 1:
The patent converts the harmful self-interference signal into a beneficial cancellation reference signal. The transmission circuit generates the self-interference component, which is then captured and used by the cancellation circuit to generate an equal and opposite cancellation signal, transforming the harmful interference into the key element needed for its removal.
Solution Approach 2:
The self-interference cancellation circuit acts as an intermediary between the transmission circuit and reception circuit. It receives the self-interference component, processes it through analog and digital cancellation paths, and generates cancellation signals that mediate the removal of interference from the received signal.
2Adaptability or versatility
If self-interference cancellation circuit is added to enable full-duplex mode, then transmission flexibility is improved, but device complexity increases
Solution Approach 1:
The cancellation circuit is segmented into distinct functional blocks: an analog self-interference cancellation path and a digital self-interference cancellation path. This segmentation allows each path to handle specific aspects of interference removal, making the overall complex function more manageable and implementable through modular circuit design.
Solution Approach 2:
The self-interference cancellation circuit is designed to work in conjunction with both full-duplex and half-duplex modes, providing adaptability. The control circuit determines which mode to use based on system conditions, making the cancellation functionality universally applicable while maintaining operational flexibility.
3Productivity
If full-duplex mode is used to increase throughput, then communication efficiency is improved, but transmission stability deteriorates
Solution Approach 1:
The system implements feedback through the control circuit that monitors transmission conditions and adjusts the operating mode accordingly. The self-interference cancellation circuit also provides feedback about interference levels, enabling the system to stabilize transmission by switching between full-duplex and half-duplex modes based on real-time conditions.
Data Source
AI summary
The present invention discloses a wireless communication device including: a transmission circuit generating a digital modulation signal according to transmission data, and analogizing the digital modulation signal to generate and transmit a transmission signal in a first mode; a reception circuit receiving a reception signal including an interference component caused by the transmission circuit; a self-interference cancellation circuit being enabled in the first mode and disabled in a second mode, providing an analog self-interference cancellation signal for the wireless reception circuit according to the transmission signal to cancel a part of the interference component, and providing a digital self-interference cancellation signal for the reception circuit according to the digital modulation signal to cancel another part of the interference component; and a control circuit having the wireless communication device operate in one of the first mode and the second mode according to at least one of indices and parameters.