Digital Self-Interference Cancellation in Full-Duplex Terahertz Systems
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Solution Overview
Problem
Full-duplex wireless communication systems face challenges in self-interference cancellation, particularly in 6G communication systems operating in the terahertz band, where severe path loss and atmospheric absorption necessitate advanced technologies to maintain signal transmission distance and spectral efficiency.
Innovation Solution
A method and apparatus for digital self-interference cancellation in full-duplex systems, involving the acquisition of time-axis digital transmission signals, extraction of non-linear signal samples, conversion to frequency-axis signals, estimation of self-interference channel information, and performance of digital self-interference cancellation using estimated channel information and coefficients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex operation is implemented in 6G terahertz band, then spectral efficiency and data rate are improved, but self-interference increases
Solution Approach 1:
The patent extracts and removes self-interference signals from the received signal through digital self-interference cancellation. The transmitter generates a copy of its own transmitted signal, processes it through channel estimation to replicate the self-interference component, and then subtracts this estimated self-interference from the received signal to isolate the desired signal.
Solution Approach 2:
The patent employs feedback mechanisms where the received signal is processed to estimate channel characteristics, and this estimated channel information is fed back to generate the self-interference cancellation signal. The feedback loop continuously refines the cancellation by comparing estimated and actual self-interference patterns.
2Productivity
If full-duplex operation is implemented in 6G terahertz band, then data rate is improved, but signal transmission distance is reduced due to severe path loss
Solution Approach 1:
The patent replaces traditional RF-based self-interference cancellation with digital signal processing techniques. Instead of using physical isolation or RF cancellation circuits, the system uses digital domain operations including correlation analysis, channel estimation, and digital subtraction to eliminate self-interference, enabling more effective interference management in terahertz band full-duplex operations.
3Object-generated harmful factors
If digital self-interference cancellation is performed, then self-interference is reduced, but processing complexity increases
Solution Approach 1:
The patent segments the self-interference cancellation process into distinct functional modules: signal acquisition, correlation processing, channel estimation, and digital subtraction. Each module handles a specific aspect of the cancellation task, making the overall complex process more manageable and implementable through standardized processing stages.
Data Source
AI summary
The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate beyond a 4G communication system such as LTE. The present disclosure relates to a method by a transmitting/receiving device, the method enabling: acquiring a time axis digital transmission signal; receiving a reception signal including a self-interference signal; extracting a time axis nonlinear signal sample from the time axis digital transmission signal; converting the time axis digital transmission signal and the time axis nonlinear signal sample into a frequency axis digital transmission signal and a frequency axis nonlinear signal sample; converting the reception signal into a frequency axis digital reception signal; estimating channel information of a self-interference channel, and a nonlinear signal coefficient of the self-interference signal, on the basis of the frequency axis digital transmission signal, the frequency axis nonlinear signal sample and the frequency axis digital reception signal; estimating the self-interference signal on the basis of the channel information and the nonlinear signal coefficient; and carrying out digital self-interference cancellation for the frequency axis digital reception signal by using the self-interference signal.