Orbital angular momentum (OAM) multiplexing has recently been proposed as a solution to the ultimate goal of increasing the channel capacity of wireless communication links because of the existence of infinite orthogonal modes. It can be combined with the existing conventional multiplexing techniques to boost up the data rate multiple times for future wireless communication systems. We analyze the fundamental behavior of the channel capacity of OAM channels based on two concepts for the most common Laguerre-Gaussian OAM beams: paraxiality and orthogonality. We also confirm our general theory by applying the proposed method to the evanescing OAM beams, circular transverse electric beams. Our study is based on calculating the paraxial estimator of these OAM beams and relating it as a parameter that limits the degree of freedom in OAM channels. In particular, we investigate the dependency on physical parameters, such as transmitter and receiver sizes, in our calculation to define the capacity of OAM channels.

中文翻译：

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轨道角动量通道的极限承载力分析

由于存在无限正交模式，最近提出了将轨道角动量（OAM）多路复用作为增加无线通信链路的信道容量这一最终目标的解决方案。它可以与现有的常规多路复用技术相结合，以多次提高数据速率，以用于未来的无线通信系统。我们基于最常见的Laguerre-Gaussian OAM光束的两个概念，分析OAM信道的信道容量的基本行为：近轴性和正交性。我们还通过将所提出的方法应用于避开OAM束，圆形横向电束来确认我们的一般理论。我们的研究基于计算这些OAM光束的近轴估算器，并将其与限制OAM通道自由度的参数相关联。