A WFRFT-based multi-beam directional modulation scheme replaces artificial noise with a keyed transform, saving about 1 dB of transmit power while keeping signals secure from eavesdroppers near or at the users' locations.
Dual-beam directional modulation technique for physical-layer secure communication,
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WFRFT-aided Power-efficient Multi-beam Directional Modulation Schemes Based on Frequency Diverse Array
A WFRFT-based multi-beam directional modulation scheme replaces artificial noise with a keyed transform, saving about 1 dB of transmit power while keeping signals secure from eavesdroppers near or at the users' locations.