A Novel Train-to-Train Communication Model Design Based on Multihop in High-Speed Railway

Table 2

Comparison of technique index of the GSM-R, RCAS, and train-to-train in physical layer.

Technique index	GSM-R	RCAS	Train-to-Train
Bandwidth; (MHz/W)	10^−2	10	0.067
Minimum receiving SNR; (dB/MHz/W)	3.32	2.5	0.66
Average BER; (/MHz/W)	2.5 * 10^−6	10^−4	7.4 * 10^−8
Transmit power; (W/MHz)	40	0.1	13.59
Coverage area; (Km)	3	5	6
Minimum delay; (s)	1	∖	10
Frequency; (MHz)	900	460	300