RF Receiver Non-Linear Component Cancellation
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Solution Overview
Problem
Radio frequency (RF) receiver systems face challenges in reducing non-linear components in signals, which can lead to distortion and interference, especially in multi-mode and multi-frequency environments like mobile telephony, where traditional architectures struggle with linearity, selectivity, and power consumption.
Innovation Solution
A RF receiver system that estimates and corrects unwanted non-linear components by generating a correction signal using finite impulse response (FIR) filters and digital domain processing, allowing for reduced impact of harmonics and intermodulation distortion, enabling operation across multiple standards and frequency bands with improved linearity and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional RF receiver architecture is used, then the receiver can operate across multiple frequency bands and modes, but non-linear distortion and interference from unwanted signal components increase
Solution Approach 1:
The patent estimates the non-linear unwanted components using the actual input signal and deliberately applies equivalent non-linear processing to generate correction signals. By converting the harmful non-linear distortion into a usable correction signal, the system cancels out the unwanted components while maintaining multi-frequency operation capability
Solution Approach 2:
The system uses feedback by estimating the unwanted non-linear components based on the input signal and feeding back correction signals to cancel these components. The correction signal generator continuously adjusts the cancellation based on the estimated non-linear distortion, enabling the receiver to maintain linearity across multiple frequency bands
2Manufacturing precision
If narrowband filtering is applied to reduce unwanted components, then linearity improves, but the receiver selectivity and ability to handle broadband signals deteriorates
Solution Approach 1:
The patent applies local quality by targeting specific frequency components for correction. The system identifies and corrects unwanted non-linear components at specific frequencies while leaving the desired broadband signal intact. This allows linearity improvement in specific frequency regions without compromising overall broadband signal handling capability
3Object-generated harmful factors
If complex non-linear correction processing is implemented, then unwanted component reduction improves, but computational complexity and power consumption increase
Solution Approach 1:
The patent implements partial action by focusing correction efforts on the most significant non-linear components rather than attempting to correct all distortion products. The system estimates and corrects the dominant unwanted components using simplified models, achieving effective reduction with reduced computational complexity and lower power consumption compared to comprehensive correction approaches
Data Source
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AI summary
A system is described for forming an estimate of an unwanted signal component that may be formed as a result of non-linearities in a system. The estimate is used to form a cancellation signal which is added to an input signal to reduce the influence of the unwanted component.