5Hofestadt H, GSM-R: global communications for railways[C]. Electric Railways in a United 111-115. system for mobile radio International Conference on Europe, Amsterdam, 1995:.
6Snily A and Soler J. An overview of GSM-R technology and its shortcomings[C]. 2012 12th International Conference on ITS Telecommunications (ITST), Taipei, 2012: 626-629.
7Jaime C S, Mariano M G, Alonso J I, et al.. Long term evolution in high speed railway environments: feasibility and challenges[J]. Bell Labs Technical Journal, 2013, 18(2): 237-253.
8Roche G D L, Andres A G, Ben A, et al.. LTE-Advanced and Next Generation Wireless Networks: Channel Modelling and Propagation[M]. New York: John Wiley & Sons, 2012: 56-58.
9Hlawatsch F and Matz G. Wireless Communications over Rapidly Time-varying Channels[M]. Oxford: Access Online via Elsevier, 2011: 10-11.
10Ghazal A, Wang C X, Ai B, et al.. A nonstationary wideband MIMO channel model for high-mobility intelligent transportation systems[J]. IEEE Transactions on Intelligent Transportation Systems, DOI: 10.1109/TITS. 2014. 2345956.
