Intermodulation Interference Cancellation in RF Receivers
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Solution Overview
Problem
Miniaturized radio frequency (RF) components in wireless communication devices suffer from reduced performance in terms of noise and interference, necessitating improved interference cancellation methods to maintain radio performance while being cost-effective and power-efficient.
Innovation Solution
A method for cancelling intermodulation interference in receivers involves obtaining model values based on the power and temperature of passive and active components, using these values to mathematically model and correct intermodulation distortion in the digital signal processing domain, with adaptive algorithms updating models based on signal quality and differences from expected signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If RF components are miniaturized to reduce device size and cost, then device size and cost are improved, but noise and interference performance deteriorate
Solution Approach 1:
The patent converts the harmful intermodulation distortion generated by miniaturized RF components into a measurable signal characteristic. By modeling the non-linear distortion products and using them to identify and cancel the interfering signals, the harmful distortion is transformed into a useful indicator for interference cancellation, thereby maintaining good radio performance despite component miniaturization.
Solution Approach 2:
The patent changes the parameter domain from physical RF signal processing to digital baseband signal processing. By measuring and modeling distortion products in the digital domain and using these models to cancel interference, the system compensates for the degraded RF performance of miniaturized components through digital parameter manipulation and signal processing.
2Object-affected harmful factors
If conventional RF components are used without miniaturization to maintain performance, then noise and interference performance is improved, but device size and cost increase
Solution Approach 1:
The patent replaces the mechanical/physical RF filtering and shielding approaches with digital signal processing methods. Instead of using larger physical components or more complex RF filtering hardware to reject interference, the system uses digital modeling and cancellation algorithms to eliminate intermodulation products, thereby reducing device size while maintaining performance.
3Object-affected harmful factors
If high-performance RF components are used to maintain radio performance, then interference resistance is improved, but power consumption and cost increase
Solution Approach 1:
The patent uses computationally efficient digital signal processing methods that can be implemented with low-power processors or FPGAs. The interference cancellation is performed using simple multiplication operations with pre-calculated model values, which consume significantly less power than high-performance RF components would require, making it suitable for battery-powered wireless devices.
Data Source
AI summary
Cancelling of intermodulation interference is described. A digital signal sample (x) is received and a power of the received digital signal sample is obtained. Based on the obtained power, at least one model value is obtained from a model that models model values of a non-linearity in amplitude and phase of a received signal that passes through passive and active components in the receiver. The model values correspond to a plurality of powers of the received signal. Intermodulation interference is then cancelled by multiplying the received digital signal sample with the obtained at least one model value, thereby obtaining an output digital signal sample (y) from which intermodulation interference, inflicted by the receiver, is cancelled.