This letter experimentally demonstrated the performance improvement of orbital-angular-momentum (OAM) based 2 ×\times 2 MIMO communication by using the diversity of different OAM modes. The OAM antenna we used is an eight-arm Archimedean spiral antenna (ASA) capable of generating multiple high-quality OAM vortex waves individually or two types of two-mode mixed vortex waves simultaneously. Both of the two cases are investigated for MIMO communication by evaluating the throughput performance. For MIMO with two OAM modes (generated by two ASAs separately), the throughput improves upon traditional MIMO by up to 30.50%, while for MIMO with two-mode mixed vortex waves (generated by one ASA), 6.59% throughput improvement is obtained.

中文翻译：

---

使用 OAM 天线的无线多输入多输出系统的吞吐量性能


该信通过利用不同OAM模式的多样性，通过实验证明了基于轨道角动量（OAM）的2×\times 2 MIMO通信的性能改进。我们使用的OAM天线是八臂阿基米德螺旋天线（ASA），能够单独产生多个高质量的OAM涡旋波或同时产生两种双模混合涡旋波。通过评估吞吐量性能来研究这两种情况的 MIMO 通信。对于具有两种OAM模式的MIMO（由两个ASA分别生成），吞吐量比传统MIMO提高了30.50%，而对于具有两种模式混合涡旋波的MIMO（由一个ASA生成），吞吐量提高了6.59%。