基于毫米波高铁车地通信的自适应多波束成形方法

Millimeter Wave Based Adaptive Multi-beamforming Scheme for High-speed Railway Vehicle-ground Communications

文中提出了一种基于毫米波高铁车地通信的自适应多波束成形方法。在该方法中,基站利用毫米波同时发射多个具有不同宽度的波束进行信号传输,从而提升系统的吞吐量。多波束传输方法也可以降低系统的通信中断概率。但是,多个波束同时传输信号会引发波束间干扰的问题。为了减弱其影响,采用一种自适应波束激活算法来实时调整激活波束的数量,使系统在当前时刻保持最佳的吞吐量性能。理论分析和仿真结果表明,所提方法可以进一步提升高铁车地通信系统的吞吐量,同时还可以获得较低的通信中断概率。

A millimeter wave based adaptive multi-beamforming scheme for high-speed railway(HSR)vehicle-ground communications is proposed in this paper.In the proposed scheme,multiple beams with different beam-width are formed by base station simultaneously to improve the system throughputs.In the multi-beam transmission method,the outage probability could be decreased as well.Unfortunately,the inter beam interference(IBI)is introduced when multiple beams transmit signals simultaneously.Therefore,an adaptive algorithm adjusting the activated beams in real time is presented in this scheme to mitigate the IBI and maintain an optimal throughput at current time.Theoretical analysis and simulation results suggest that the proposed scheme can improve the system throughput with a lower outage probability in HSR vehicle-ground communications.