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Deploying multiple antennas on high speed trains is an effective way toenhance the information transmission performance for high speed railway (HSR)wireless communication systems. However, how to efficiently deploy multipleantennas on a train? This problem has not been studied yet. In this paper, weshall investigate efficient antenna deployment strategies for HSR communicationsystems where two multi-antenna deployment strategies, i.e., the equidistantstrategy and the fixed-interval strategy, are considered. To evaluate thesystem performance, mobile service amount and outage time ratio are introduced.Theoretical analysis and numerical results show that, when the length of thetrain is not very large, for two-antenna case, by increasing the distance ofneighboring antennas in a reasonable region, the system performance can beenhanced. It is also shown that the two strategies have much differenceperformance behavior in terms of instantaneous channel capacity, and thefixed-interval strategy may achieve much better performance than theequidistant one in terms of service amount and outage time ratio when theantenna number is much large.

Deploying Multiple Antennas on High-speed Trains: Equidistant Strategy v.s. Fixed-Interval Strategy