A large data rate is an essential requirement of 6G wireless communication systems. Index Modulation (IM) and Orbital Angular Momentum (OAM) which are introduced recently are two high spectral efficiency technologies. In IM, some additional information is conveyed by activating a subset of transmission entities, and OAM is a novel multiplexing scheme, which can be used in short distance wireless communication. In this paper, we propose the Orbital Angular Momentum and Mode Multiplexing based Index Modulation (OAM-MM-IM) method for increasing the spectral efficiency, in which by activating some OAM modes, and varying the modulation types of each activated OAM modes, additional information bits are sent. Also, for detecting the OAM-MM-IM signals, in addition to traditional Maximum Likelihood (ML) detector, we propose two new low complexity detectors that have a performance close to the ML detector. Simulation results indicate the outperforming of the proposed method compare to the reference OAM-IM method in SE and BER criteria.

大数据速率是6G无线通信系统的基本要求。最近推出的索引调制 (IM) 和轨道角动量 (OAM) 是两种高频谱效率技术。在 IM 中，通过激活传输实体的子集来传递一些附加信息，而 OAM 是一种新颖的复用方案，可用于短距离无线通信。在本文中，我们提出了基于轨道角动量和模式复用的索引调制 (OAM-MM-IM) 方法来提高频谱效率，其中通过激活一些 OAM 模式，并改变每个激活的 OAM 模式的调制类型，附加发送信息位。此外，为了检测 OAM-MM-IM 信号，除了传统的最大似然 (ML) 检测器，我们提出了两个新的低复杂度检测器，它们的性能接近 ML 检测器。仿真结果表明，与参考 OAM-IM 方法相比，所提出的方法在 SE 和 BER 标准方面的性能更好。