轨道角动量（OAM）反映了电磁波与绕动相关的空间结构化特性，其螺锥状的空间相位波前和涡旋状的空间强度分布特性，赋予电磁波一种新的自由度- - 旋转自由度（Rotational EM Degree of Freedom）。这为无线电通信带来新的携带和传递信息的方式。由于OAM理论上具有无穷多个正交的特征态，从而利用OAM进行大容量信息传输将成为可能，这对于资源极度匮乏、技术亟待革新的无线通信具有重大的意义。本项目拟进一步深入了解和探索无线OAM复用传输机理，分析其潜在的容量性能，探讨OAM分集复用折中问题，并重点研究与无线OAM生成、调制、采样和检测相关的信号处理技术，为OAM在未来无线通信中的应用提供必要的理论支撑和合理的技术方案。

The Orbital Angular Momentum (OAM) is an important physical quantity reflecting the spatial structural characteristics of an electromagnetic wave with helicoidal phase rotation.The OAM-carrying EM wave has a corkscrew-like phase front and vortex-like spatial strength distribution, which is thereby endowed with a new physical dimension, i.e., the rotational EM degree of freedom. Such dimension provides a potentially effective new way in carrying and transferring information. Due to its fascinating feature that there are potentially infinite number of orthogonal OAM states of a single EM wave, large capacity of information transmission my be possible in the future by properly exploiting the OAM. This is extremely significant to the area of wireless communications which have been facing a sersious resource scarcity and calling for new boost of innovation. In our proposal, we aims to explore the new features of OAM, and try to study the mechanism of OAM Multiplexing and to evaluate its potential capacity performance. We will also investigate the possible tradeoff between the OAM multiplexing and topological diversity. After that, we will focus on the key technologies related with the generation, modulation, sampling and detection of OAM signals, in order to provide design references or design guidelines for the application of OAM in future wireless communications.