Lattice Signal Sets to Combat Pulsed Interference from Aeronautical Signals

The inlay approach for the Broadband Aeronautical Multicarrier Communications (B-AMC) system is exposed to severe interference from the adjacent channels of the distance measuring equipment (DME) system. Here, we propose a simple technique to mitigate DME interference and subsequently enable transmission in the spectral gaps of the DME channels. The proposed technique uses a precoding at the transmitter based on employing lattice signal sets in order to modify the shape of the DME signal spectrum. Hereto, a simple clipping method is applied to the received subcarriers to mitigate the impact of the DME interference. Simulations show that the proposed subcarrier clipping technique can considerably reduce the effect of the DME signal by choosing appropriate clipping thresholds. They have been selected to maximize the signal-to interference-and-noise ratio (SINR) after the clipping operation. It has also been confirmed by simulations that the proposed method offers a significantly better performance when compared to current mitigation techniques.