Comparative Analysis on MIMO Antenna Configuration of High-Speed Railroad System

The performances of various antenna configurations are compared from a capacity point of view for the high-speed railway MIMO system. The standard IMT-Advanced (IMT-A) channel model proposed by International Telecommunication Union (ITU) is adopted in the capacity analysis. The results show that the MIMO capacity increases with the element number and spacing of the antenna array. It is also illustrated that the polarized antenna can be utilized for capacity enhancement. Moreover, the impact of array orientation is investigated based on the special layout of the railway communication scenario. According to the simulation results, some suggestions on the MIMO configurations are given for the improvement of the next generation railway communication system.