Full-Duplex Signal Shaping via Multi-Stage Interference Cancellation
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Solution Overview
Problem
Conventional full-duplex communication systems face challenges in simultaneous signal transmission and reception due to receiver saturation caused by self-interference, which limits their throughput and reliability.
Innovation Solution
A system with a signal processing layer that includes an interference cancellation component and a filtering component, using a combination of analog and digital circuitry to cancel self-interference and remove remaining interference, allowing for simultaneous transmission and reception on different spectrum fragments without saturation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional full-duplex systems attempt simultaneous transmission and reception, then communication in both directions is enabled, but receiver saturation occurs due to self-interference
Solution Approach 1:
The patent segments the interference cancellation process into multiple stages: analog cancellation in the RF path, intermediate frequency cancellation, and digital baseband cancellation. This multi-level segmentation allows progressive reduction of self-interference at different signal processing stages, enabling simultaneous transmission and reception without receiver saturation.
Solution Approach 2:
The system performs preliminary interference cancellation in the analog RF path before the receiver processes the signal. By canceling a portion of self-interference early in the signal chain, the receiver is protected from saturation before it occurs, enabling reliable full-duplex operation.
2Productivity
If interference cancellation is implemented to remove self-interference, then full-duplex communication is enabled, but system complexity increases due to additional processing components
Solution Approach 1:
The patent merges interference cancellation functionality into the existing signal processing chain by integrating analog cancellation circuits with the RF receiver architecture and combining multiple cancellation stages into a unified full-duplex signal processing layer. This consolidation reduces overall system complexity compared to adding separate standalone cancellation systems.
Solution Approach 2:
The signal processing layer is designed to perform multiple functions simultaneously: it handles normal signal reception, implements multi-stage interference cancellation, and manages full-duplex operation across arbitrary spectrum fragments. This multi-functionality reduces the need for separate dedicated components for each function.
3Adaptability or versatility
If spectrum fragments are used for full-duplex communication, then spectrum utilization is improved, but interference management becomes more difficult across arbitrary frequency bands
Solution Approach 1:
The system dynamically adapts the interference cancellation process to work across arbitrary spectrum fragments by using wideband RF processing and flexible digital signal processing that can handle any frequency allocation. The cancellation mechanisms are designed to be frequency-agnostic, automatically adjusting to the specific spectrum fragments being used for transmission and reception.
Data Source
AI summary
A system for processing signals includes an interference cancellation component that samples an RF transmit signal, transforms the sampled RF transmit signal into a self-interference cancellation signal, and combines the sampled RF transmit signal and self-interference cancellation signal to remove a first portion of interference from the RF receive signal, the combination forming a processed RF signal; and a filtering component that removes a second portion of interference from the processed signal by downconverting the processed RF signal to a processed baseband signal, sampling the processed baseband signal to create a processed digital signal, and filtering the processed digital signal to remove the second portion of interference.