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With the assistance of singular value decomposition (SVD), a multi-beamdirectional modulation (DM) scheme based on symmetrical multi-carrier frequencydiverse array (FDA) is proposed. The proposed DM scheme is capable of achievingrange-angle dependent physical layer secure (PLS) transmissions in free spacewith much lower complexity than the conventional zero-forcing (ZF) method.Theoretical and simulated results about secrecy rate and complexity verify theimproved computational efficiency and considerable memory savings despite avery small penalty of secrecy rate.

SVD-Aided Multi-Beam Directional Modulation Scheme Based on Frequency Diverse Array