With the assistance of singular value decomposition (SVD), a multi-beam directional modulation (DM) scheme based on symmetrical multi-carrier frequency diverse array (FDA) is proposed. The proposed DM scheme is capable of achieving range-angle dependent physical layer secure (PLS) transmissions in free space with much lower complexity than the conventional zero-forcing (ZF) method. Theoretical and simulated results about secrecy rate and complexity verify the improved computational efficiency and considerable memory savings despite a very small penalty of secrecy rate.

中文翻译：

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基于分频阵列的SVD辅助多波束定向调制方案

借助奇异值分解(SVD)，提出了一种基于对称多载波频率分集阵列(FDA)的多波束定向调制(DM)方案。所提出的 DM 方案能够在自由空间中实现依赖于距离角的物理层安全 (PLS) 传输，其复杂性远低于传统的迫零 (ZF) 方法。尽管保密率的损失很小，但有关保密率和复杂性的理论和模拟结果验证了计算效率的提高和可观的内存节省。