?is paper analyzes the end-to-end outage performance of high-speed-railway train-to-train communication model in highspeed\r\nrailway over independent identical and nonidentical Nakagami-m channels. ?e train-to-train communication is intertrain\r\ncommunication without an aid of infrastructure (for base station). Source train uses trains on other rail tracks as relays\r\nto transmit signals to destination train on the same track. ?e mechanism of such communication among trains can be divided\r\ninto three cases based on occurrence of possible-occurrence relay trains. ??e ??rst present a new closed form for the sum of squared\r\nindependent Nakagami-m variates and then derive an expression for the outage probability of the identical and non-identical\r\nNakagami-m channels in three cases. In particular, the problem is improved by the proposed formulation that statistic for sum of\r\nsquared Nakagami-m variates with identical m tends to be in??nite. Numerical analysis indicates that the derived analytic results\r\nare reasonable and the outage performance is better over Nakagami-m channel in high-speed railway scenarios.
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