Analog RF Interference Cancellation for High-Power Receiver Protection
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Solution Overview
Problem
Existing interference cancellation systems are unable to simultaneously handle high-powered and low-powered interference with low noise figure and high linearity, leading to degradation of receiver sensitivity and demodulation performance in tactical RF communication systems.
Innovation Solution
A cancel-first architecture using a high-power analog interference canceller (HPAIC) as the first RF stage, followed by digital interference cancellation, to achieve low noise figure and high linearity, effectively canceling both high-powered and low-powered interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-power interfering signals are directly processed by the receiver, then the receiver can detect signals, but the receiver analog front-end interface becomes saturated or damaged
Solution Approach 1:
The patent applies preliminary action by placing an analog interference canceller at the front-end of the receiver to cancel high-power interfering signals before they can saturate or damage the receiver's analog front-end interface. The canceller generates an anti-phase signal to destructively interfere with the harmful interference, protecting the receiver in advance.
Solution Approach 2:
The analog interference canceller serves as an intermediary component between the antenna and the receiver. It processes the received signal to remove high-power interference before passing the cleaned signal to the receiver, thereby protecting the receiver without requiring direct modification of the receiver itself.
2Object-affected harmful factors
If traditional interference cancellation systems process high-powered interference, then some interference can be reduced, but the systems cannot simultaneously maintain low noise figure and high linearity
Solution Approach 1:
The patent replaces traditional digital interference cancellation methods with an analog interference cancellation approach. The analog canceller operates in the analog domain before digitization, using analog signal processing techniques to cancel high-power interference while maintaining the noise figure and linearity characteristics of the receiver.
Solution Approach 2:
The interference cancellation function is segmented into a separate analog interference canceller module that operates independently before the main receiver chain. This segmentation allows the canceller to handle high-power interference without affecting the noise figure and linearity of the main receiver, enabling simultaneous interference rejection and sensitivity maintenance.
3Adaptability or versatility
If the receiver processes both high-powered and low-powered signals simultaneously, then all signals can be received, but the low-power signal detection is adversely impacted
Solution Approach 1:
The patent applies preliminary anti-action by using the analog interference canceller to generate and subtract an anti-phase version of the high-power interfering signal from the received signal. This preliminary cancellation removes the harmful effect of high-powered signals before the low-power signal detection process, enabling accurate detection of both high and low-power signals simultaneously.
Data Source
AI summary
Methods, systems and devices for interference cancellation of high-power input signals in the analog domain are described. An example method of interference cancellation includes receiving, via an antenna, an analog signal comprising a signal of interest and one or more interfering signals, wherein the one or more interfering signals comprises a high-power interfering signal with a signal power greater than 15 dBm, determining, based on a reference signal corresponding to the high-power interfering signal, an update to at least one parameter of the reference signal, wherein the update is determined by minimizing a cost function of a difference between the reference signal and the high-power interfering signal, generating, based on the update to the at least one parameter, a modified reference signal, and generating, based on coupling the modified reference signal to the analog signal, an interference-canceled signal comprising the signal of interest.