轨道角动量(Orbital angular momentum, OAM)复用通信系统性能不可避免地受到发、收两端OAM态非对齐的影响。针对OAM态复用通信, 提出了一种将多输入多输出(Multiple-input multiple-output, MIMO)均衡技术用于降低OAM系统发、收两端非对齐对系统性能带来影响的方案。所提方 案利用MIMO均衡技术纠正或部分纠正复用OAM态在发、收两端非对齐时的模间串扰。数值仿真结果表明所提方 案可有效地降低OAM非对齐通信系统模式间的串扰,提升了系统的误码率性能,在位置偏移和角度偏斜量较小 情形下,系统误码率可提升1～2个数量级。

Performance of orbital angular momentum (OAM) multiplexing communication system is inevitably degraded by the misalignment of OAM modes between the transmitter and receiver. Aiming at OAM state multiplexing system, a scheme used to reduce influences on system performance of the OAM misalignment between the transmitter and receiver is proposed by adopting multiple-input multiple-output (MIMO) equalization technology. The proposed scheme corrects or partially corrects the intermodal crosstalk of OAM state caused by misalignment of the transmitter and receiver ends. Numerical simulation results show that the proposed scheme can effectively reduce crosstalk between OAM modes of misaligned communication system, and the system bit error rate performance is improved. In the case of small lateral displacement and angular deflection, the system bit error rate can be increased by one or two orders of magnitude.