基于模态复用的物联网高速数据回传研究

High Speed IoT Data Return Research Based on Mode Multiplexing

为了解决物联网(Internet of Things, IoT)终端数据高速回传问题,提出了基于栅格化方形面阵的轨道角动量(Orbital Angular Momentum, OAM)高速回传方法。论证了栅格化正方形面阵可以分解为多圈4阵元均匀圆环阵(Uniform Circular Array, UCA),并给出了馈电方法与具体实施步骤。基于此,进一步推导了采用栅格化方形面阵进行基于多圈UCA的OAM多模复用通信模型,并系统地分析了复用和分集增益。仿真结果表明,所提方法相对于传统方法有极大的信道容量和误码率(Bit Error Rate, BER)性能提升。所提方法只需收发方形面阵中心对准即可,无需信道估计,极大地降低了复杂度;此外,超高的分集增益可以极大地降低发射功率。因此,所提方法尤其适用于IoT终端节点这类低功耗、低复杂度的发射机,为IoT数据高速回传提供了高效的解决方案。

In order to solve the problem of high-speed data return from Internet of Things(IoT) terminals, an Orbital Angular Momentum(OAM) high-speed data return method based on Grid Square Array(GSA) is proposed. It is demonstrated that GSA can be decomposed into multi-loop 4-element Uniform Circular Array(UCA). The feeding methods and the specific implementation steps are then given. Based on this, the construction process of the OAM based multi-mode multiplexing communication model of multi-UCA implemented by GSA is derived, and the multiplexing and diversity gain is systematically analyzed. The simulation results show that compared with the traditional methods, the proposed method can greatly improve the channel capacity and Bit Error Rate(BER) performance. When using the proposed method, only the alignment of the centers of receiving and transmitting GSA is required, and there is no need for channel estimation, which greatly reduces the complexity;besides, the ultra-high diversity gain also greatly reduces the transmission power. Therefore, the proposed method is especially suitable for low power and low complexity transmitters such as IoT terminals, and provides an efficient solution for high-speed data return of IoT.