Full-Duplex Transceiver Phase Noise Mitigation
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Solution Overview
Problem
Full-duplex wireless communication systems face limitations in self-interference cancellation due to phase noise from local oscillators and other components, which hampers their performance and spectral efficiency.
Innovation Solution
The system incorporates phase noise mitigation techniques such as local oscillator sharing, embedded pilot measuring, and secondary transmission/reception, utilizing both digital and analog self-interference cancellers to adaptively reduce phase noise and enhance self-interference cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex wireless communication systems are implemented to improve spectral efficiency, then spectral efficiency is improved, but self-interference increases due to simultaneous transmission and reception on the same channel
Solution Approach 1:
The patent segments the self-interference cancellation process into multiple stages: analog cancellation at the RF front-end and digital cancellation in the baseband processor. This segmentation allows each stage to handle different aspects of interference, with analog cancellation addressing the strongest interference components and digital cancellation refining the cancellation, thereby effectively reducing self-interference while maintaining spectral efficiency
Solution Approach 2:
The patent introduces an intermediary analog self-interference canceller that generates a cancellation signal based on the transmitted signal and subtracts it from the received signal before digital processing. This intermediary component acts as a mediator between the transmit and receive paths, reducing the self-interference load on the digital processor and improving overall system performance
2Object-generated harmful factors
If traditional self-interference cancellation methods are used to reduce self-interference, then self-interference is reduced, but performance is limited by phase noise from local oscillators
Solution Approach 1:
The patent implements feedback mechanisms where the system continuously monitors the self-interference cancellation performance and adjusts the cancellation parameters accordingly. The digital self-interference canceller uses feedback from the received signal to optimize cancellation coefficients, and the system adapts to phase noise variations through continuous calibration, thereby maintaining high cancellation performance despite phase noise from local oscillators
Solution Approach 2:
The patent employs parameter changes by dynamically adjusting the cancellation coefficients and filter parameters based on operating conditions. The system modifies the analog cancellation parameters and digital processing parameters in response to changing phase noise characteristics, allowing the self-interference cancellation to adapt and maintain effectiveness across different scenarios despite oscillator phase noise
Data Source
AI summary
A system for phase noise mitigated communication including a primary transmitter that converts a digital transmit signal to an analog transmit signal, a primary receiver that receives an analog receive signal and converts the analog receive signal to a digital receive signal, an analog self-interference canceller that samples the analog transmit signal, generates an analog self-interference cancellation signal based on the analog transmit signal, and combines the analog self-interference cancellation signal with the analog receive signal and a digital self-interference canceller that samples the digital transmit signal, generates a digital self-interference cancellation signal based on the digital transmit signal, and combines the digital self-interference cancellation signal with the digital receive signal.