Wireless Signal Processing for Full-Duplex Self-Interference Cancellation
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Solution Overview
Problem
The rapid growth of mobile data services, particularly high-definition and ultra-high-definition video services, poses a challenge for wireless communication systems to achieve higher transmission rates and throughput, especially in the context of full-duplex technology where self-interference is a significant issue.
Innovation Solution
A method for a device in a wireless communication system that involves compensating transmitted or received signals based on synchronization delays to eliminate self-interference, and using frequency-domain self-interference channel estimation and interpolation to reconstruct and cancel self-interference signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex technology is implemented to achieve higher transmission rates and throughput, then productivity is improved, but self-interference increases causing harmful effects
Solution Approach 1:
The patent applies self-interference cancellation technology that converts the harmful self-interference signal into a beneficial component by estimating and subtracting it from the received signal. The system estimates the self-interference channel using reference signals and reconstructs the self-interference signal to cancel it out, thereby transforming the harmful effect into a manageable parameter that enables full-duplex operation.
Solution Approach 2:
The patent implements preliminary self-interference cancellation by estimating and removing the self-interference component before decoding the received signal. The system performs channel estimation and signal reconstruction in advance to eliminate the harmful interference, ensuring that the main signal can be processed without degradation from self-interference.
2Object-generated harmful factors
If frequency-domain self-interference channel estimation and interpolation are used to cancel self-interference signals, then self-interference is reduced, but device complexity increases
Solution Approach 1:
The patent uses frequency-domain interpolation to create a copy or approximation of the self-interference channel response at data subcarriers based on measurements at reference signal subcarriers. This copying approach allows the system to estimate the self-interference channel without direct measurement at every subcarrier, reducing the processing complexity while maintaining accuracy.
3Object-generated harmful factors
If synchronization delay compensation is applied to eliminate self-interference, then self-interference is reduced, but measurement precision requirements increase
Solution Approach 1:
The patent segments the self-interference cancellation process into distinct stages: synchronization delay estimation, channel estimation at reference signal positions, interpolation to data subcarriers, and signal reconstruction. This segmentation allows each stage to be optimized independently, with the synchronization delay measurement being performed with sufficient precision for the specific application requirements.
Data Source
AI summary
The present disclosure relates to a 5G communication system or a 6G communication system for supporting higher data rates beyond a 4G communication system such as long term evolution (LTE). The present disclosure provides a device in a wireless communication system and a method performed by the device. The method comprises: for a first transmitted signal transmitted by the device and a first received signal corresponding to the first transmitted signal and received by the device, compensating one of the first transmitted signal and the first received signal, according to a first synchronization delay part of a synchronization delay between a receiver and a transmitter of the device, wherein the first synchronization delay part is an integral multiple of a predefined baseband sampling interval of the device in the synchronization delay; determining a second synchronization delay part of the synchronization delay based on one of a collection of the first received signal and the compensated first transmitted signal and a collection of the first transmitted signal and the compensated first received signal, depending on which one of the first transmitted signal and the first received signal is compensated, wherein the second synchronization delay part is a fractional multiple of the predefined baseband sampling interval of the device in the synchronization delay.