Interference Cancellation

Widespread and growing use of communication radios, electronic warfare systems, and SIGINT receivers is driving more RF systems to be installed near each other. Whenever two or more RF systems are operating near each other, there can be interference.

L3Harris has been using interference cancellers to solve the hardest interference problems for over forty years.

There are many common ways to mitigate this interference, such as physical isolation, time multiplexing, and RF filters.  Each approach has benefits and drawbacks. When L3Harris attacks an interference problem, we apply all of these common methods as appropriate. For the toughest interference problems, we use one of the most powerful methods in our interference mitigation toolbox – interference cancellation.

How does an interference canceller reduce interference?

An interference canceller uses a sample of the interfering signal to generate a real-time anti-interference signal that is the exact opposite of the interfering signal as it appears at the receiving antenna. The interference canceller combines the interference and anti-interference signals, cancelling each other out. The result is that the interference is subtracted from the receive path, leaving only the interference-free desired signal. An L3Harris interference canceller doesn’t affect transmitter performance. The canceller removes the main interferer power, broadband noise and spurious signals, even those that are on the same frequency as the protected receiver.

Our latest interference cancellation solutions provide 100db or more of real-world interference cancellation.

The latest generation of Harris interference cancellers use the Advanced Interference Mitigation System (AIMS) to enable the reuse of standard canceller building blocks to rapidly deploy solutions for a wide range of interference profiles at fixed sites, on ground vehicles, on aircraft, and on maritime vessels. An AIMS-based solution can provide 100dB or more of real-world interference cancellation in a much smaller package than would be expected for a less-capable filter solution.