OAM-MIMO通信系统的信道容量研究

The Research on Channel Capacity of OAM-MIMO System

轨道角动量(OAM)具有独特的模分复用(MDM)方式,可以大大提高传输容量.为了提高系统的信道容量和频谱利用率,提出了一种结合OAM和多输入多输出(MIMO)技术的OAM-MIMO复用通信系统,可以在不增加带宽和天线发射功率的情况下提高信道容量和频谱利用率.采用巴特勒矩阵作为相移器,馈送信号给均匀圆形阵列天线(UCA),使得每个UCA可以同时并且独立地生成携带多种不同OAM模态信号的载波,从而显著提高系统的信道容量.实验结果表明,OAM-MIMO复用通信系统的信道容量和频谱利用率在宏小区、微小区环境下得到了很大提高.

The proposal of orbital angular momentum(OAM)provides a feasible solution for the carrier required by the next-generation mobile communication technology.Its unique modular division multiplexing(MDM)method greatly increases the transmission capacity.However,with the diversification of the next-generation communication technology services,people have put forward higher requirements for bandwidth and spectrum utilization.In order to effectively improve the channel capacity and spectrum utilization of the system,an orbital angular momentum-multiple input multiple output(OAM-MIMO)multiplexing communication system combining OAM and multiple input multiple output(MIMO)technology is proposed.The OAM-MIMO system can improve channel capacity and spectrum utilization without increasing bandwidth and antenna transmit power.The system uses the Butler matrix as a phase shifter to feed the signal to a uniform circular array antenna(UCA),so that each UCA can simultaneously and independently generate a carrier wave carrying a variety of different OAM modal signal,thereby significantly improving the channel capacity of the system.The experimental results show that the channel capacity and spectrum utilization rate of the OAM-MIMO communication system are greatly improved in the macro cell and micro cell environment.