Integrated Self-Interference Cancellation Circuit
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Solution Overview
Problem
Traditional full-duplex wireless communication systems face challenges with self-interference, leading to complex and costly circuit designs that hinder spectral efficiency, as they require separate analog and digital self-interference cancellation circuits that do not effectively utilize integrated circuit techniques.
Innovation Solution
The system integrates analog and digital self-interference cancellation using a combined architecture with tunable couplers, phase shifters, and scalers, allowing for simultaneous and parallel cancellation of self-interference across multiple signal paths, reducing circuit complexity and cost by implementing both digital and analog circuitry within a single integrated framework.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate analog and digital self-interference cancellation circuits are used, then self-interference cancellation capability is achieved, but device complexity and production cost increase
Solution Approach 1:
The patent combines separate analog and digital self-interference cancellation circuits into a single integrated circuit. The analog cancellation section processes strong self-interference signals while the digital cancellation section handles residual interference, with both sections working together in one unified device rather than as separate components, thereby reducing overall device complexity while maintaining cancellation effectiveness.
Solution Approach 2:
The integrated circuit performs multiple functions within a single device: analog signal processing for strong interference cancellation, digital signal processing for residual interference cancellation, and coordinated operation between sections. This multi-functionality eliminates the need for separate dedicated circuits for each cancellation stage.
2Reliability
If separate analog and digital self-interference cancellation circuits are used, then self-interference cancellation capability is achieved, but production cost increases
Solution Approach 1:
By merging analog and digital cancellation circuits into one integrated device, the patent reduces the total component count and assembly steps required for production. The single integrated circuit can be manufactured in larger volumes with standardized processes, lowering per-unit production costs compared to assembling multiple separate circuits.
3Reliability
If traditional self-interference cancellation circuits are used, then interference cancellation is achieved, but component utilization is lower than ideal
Solution Approach 1:
The integrated circuit design allows components to serve multiple purposes: the analog cancellation section handles strong self-interference while the digital section processes residual interference, and both sections are coordinated within the same device. This maximizes component utilization by ensuring each part of the circuit is actively engaged in the cancellation process rather than having underutilized or redundant components.
Data Source
AI summary
A system for integrated self-interference cancellation, comprising a transmit coupler, coupled to a transmit signal, that samples the transmit signal to create a sampled transmit signal; an analog self-interference canceller, coupled to the transmit coupler, comprising a controller; a signal divider, that splits the sampled transmit signal into a set of signal components; a set of phase shifters, wherein a phase shifter of the set shifts a signal component of the set of signal components by a total phase shift value; a set of scalers, wherein a scaler of the set scales the signal component by a total scale factor; a signal combiner, that combines the set of signal components into a self-interference cancellation signal; and a receive coupler, coupled to a receive signal, that combines the self-interference cancellation signal with the receive signal to remove a portion of self-interference present in the receive signal.