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arXiv 1606.06976physics.optics
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基于OAM的复用方案的频谱效率极限

On the Spectral Efficiency Limits of an OAM-based Multiplexing Scheme

Andrea Cagliero, Rossella Gaffoglio

摘要:

如在几个最近的出版物中报道的,涉及携带轨道角动量(OAM)的正交波的传输的空间复用不能提供相对于常规技术的频谱效率改进。在这项工作中,我们强调如何OAM天线阵列之间的多路传输的限制,可以从香农容量公式,作为参考的性能的复用方法的基础上的高阶信道模式。我们的方法清楚地表明,这两种技术提供相同的轴上性能。相反,阵列位置中的小的未对准会影响OAM方案,突出了无线电通信背景下传统复用方法的更大鲁棒性。

英文摘要:

As reported in several recent publications, a spatial multiplexing involving the transmission of orthogonal waves carrying Orbital Angular Momentum (OAM) is unable to provide spectral efficiency improvements with respect to the conventional techniques. In this work we emphasize how the limits of an OAM multiple transmission between antenna arrays can be derived from the Shannon capacity formula, taking as a reference the performance of a multiplexing method based on the higher-order channel modes. Our approach clearly indicates that the two techniques offer the same on-axis performance. Conversely, small misalignments in the arrays positions affect the OAM scheme, highlighting the greater robustness of a traditional multiplexing method in the context of radio communications.

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