室内走廊环境毫米波OAM信道特性分析与统计建模

针对自由空间传播模型仅能描述自由空间场景下携带轨道角动量(OAM)的涡旋信道传播特性，以及确定性稀疏多径涡旋信道模型严格依赖于传播环境而不能准确刻画真实多径场景下OAM信道传播特性的问题，该文提出毫米波OAM多径信道统计建模方法。在室内走廊环境下构建基于均匀圆形天线阵列(UCA)的OAM辐射传输系统，基于光学射线理论与UCA辐射特性，建立OAM多径信道模型。结果表明，在毫米波频段均匀分布和Nakagami-m分布能够准确地表征室内走廊多径环境下的OAM信道波前相位和幅度，视距(LoS)和非视距(NLoS)传播条件下传播距离较大时信道幅度服从瑞利分布，视距传播条件下传播距离较小时信道幅度服从莱斯分布。

Characteristic Analysis and Statistical Modeling of Millimeter Wave OAM Channel in Indoor Corridor Environment

Focusing on the problem that the free space propagation model could only describe the propagation characteristics of vortex channel carrying Orbital Angular Momentum (OAM) in free space scenario, and the deterministic sparse multipath vortex channel model is strictly dependent on the propagation environment and could not accurately describe the propagation characteristics of OAM channel in real multipath scenario, a statistical modeling method for millimeter wave OAM multipath channel is proposed in this paper. In indoor corridor environment, Uniform Circular Array (UCA)-based OAM radiation transmission system is constructed, and the OAM multipath channel model is established based on optical ray theory and UCA radiation characteristics. Results show that the wavefront phase and amplitude of OAM channel in indoor corridor multipath environment can be accurately characterized by uniform distribution and Nakagami-m distribution in millimeter bands. The channel amplitude follows Rayleigh distribution when the propagation distance is large under the Line-of-Sight (LoS) and Non-LoS (NLoS) propagation conditions, and that follows Rician distribution when the propagation distance is small under the LoS propagation conditions.