Secure and reliable communications are vital to defense forces in achieving operational goals. Likewise, limiting the opponents’ capabilities to communicate further advances the host forces’ chances of operational success. In this work, we propose a method to fortify the host forces’ wireless communications against adversarial attacks while at the same time restricting the opponents’ capabilities to wirelessly communicate. That is, we propose a band-limited known-interference cancellation (KIC) method that enables the host forces to cover a large portion of the electromagnetic spectrum with wideband jamming, yet lets the host force communication nodes cancel that jamming signal upon reception even if the nodes only receive a narrowband portion of it. We study how the proposed KIC method works based on measurements with commercial off-the-shelf software-defined radios. The results demonstrate that the band-limited KIC method achieves performance that is comparable to non-band-limited methods and, in doing so, leads the way for practical applications of cooperative jamming in scenarios where narrowband communication links span over a wide bandwidth.

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