Hybrid Analog-Digital Interference Cancellation System
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Solution Overview
Problem
Traditional interference cancellation systems face limitations in dynamic range, failing to achieve full receive system sensitivity due to high power cosite signals, which are accompanied by noise and distortion, and are unable to effectively eliminate secondary noise and distortion components, leading to receiver desensitization.
Innovation Solution
A system and method for large signal cancellation that employs a combination of analog and digital processing techniques, using a reference path and receive path with filtering, delay, and subtraction modules to isolate and eliminate interfering signals, noise, and distortion, while maintaining full system sensitivity for small signal throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional interference cancellation systems are used to cancel high power interfering signals, then the interfering signal level is reduced, but the receiver sensitivity deteriorates due to noise and distortion components
Solution Approach 1:
The patent divides the interference cancellation process into multiple stages: analog cancellation stage and digital cancellation stage. Each stage handles different aspects of interference removal, with the analog stage addressing large signal cancellation and the digital stage handling residual interference and distortion components. This segmentation allows the system to cancel high power interfering signals while preserving receiver sensitivity through coordinated multi-stage processing.
Solution Approach 2:
The patent introduces an analog-to-digital converter (ADC) as an intermediary component that bridges the analog and digital cancellation domains. The ADC captures the received signal for digital processing while the analog cancellation path handles large signal removal. This intermediary enables the system to process signals across different domains, allowing high power interference cancellation without compromising the sensitivity required for detecting weak desired signals.
2Power
If analog interference cancellation systems are used, then large signal cancellation is achieved, but dynamic range is insufficient due to internal noise and intermodulation distortion
Solution Approach 1:
The patent merges analog and digital interference cancellation systems into a hybrid architecture. The analog cancellation path handles large signal removal using high-power amplifiers and analog signal processing, while the digital cancellation path processes the converted digital signal to remove residual interference and distortion. This combination allows the system to achieve both large signal cancellation capability and extended dynamic range by leveraging the strengths of both analog and digital domains.
Solution Approach 2:
The patent changes the operational parameters of the cancellation system by operating in two distinct domains: analog domain for large signal handling and digital domain for precision processing. The system dynamically switches between or combines these parameter regimes, using analog processing when high power cancellation is needed and digital processing when fine-tuned interference removal is required, thereby expanding the overall dynamic range of the system.
3Reliability
If digital interference cancellation systems are used, then noise and distortion elimination is improved, but dynamic range is restricted due to ADC and DAC interface limitations
Solution Approach 1:
The patent transitions from purely digital processing to a multi-dimensional approach by incorporating analog signal processing in addition to digital processing. The analog cancellation path operates in the continuous voltage domain, providing an additional dimension for signal manipulation that is not constrained by ADC/DAC resolution limits. This dimensional expansion allows the system to handle signals across a wider dynamic range while maintaining the noise and distortion elimination benefits of digital processing.
4Power
If legacy interference cancellation designs are used, then 0 dBm signal level cancellation is achieved, but significantly higher signal levels cannot be handled
Solution Approach 1:
The patent implements a dynamic cancellation system that adapts its processing mode based on the input signal level. The analog cancellation path is activated for high-power signals exceeding 0 dBm, while the digital cancellation path handles lower power signals. The system dynamically switches between or combines these paths based on real-time signal conditions, providing adaptability across a wide range of signal levels from weak desired signals to strong interfering signals.
Data Source
AI summary
An interference cancellation system supports a dynamic operating range from maximum interfering signal level to the on-channel noise floor. The system uses a novel combination of analog and digital processing effectively cancelling 1) high-level interfering signal components, 2) low-level interfering noise, and 3) distortion components. The system employs an interrelated combination of cross-domain analog and digital processing techniques to defeat the inherent dynamic range limitations existing in either individual domain.