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A new directional modulation system which uses radiation pattern data for modulation encoding is proposed. The approach allows compact multiport antennas (e.g. MIMO capable antennas) to be used for directional modulation, replacing extensive arrays. The modulation weighting coefficients are calculated with a fixed, antenna specific equation, thus reducing computational complexity. The solution is intended to enhance privacy in small, battery-operated wireless devices, required for “Internet of Things” applications.
Narbudowicz, A., Ammann, M.J. & Heberling, D. (2017). Directional Modulation for Compact Devices. IEEE Antennas and Wireless Propagation Letters, vol. PP, no. 99, 2017. doi:10.1109/LAWP.2017.2697720