Feasibility Studies on the Use of Higher Frequency Bands and Beamforming Selection Scheme for High Speed Train Communication

Table 1

Frame structure parameters for a maximum speed of 500 km/h.

Frequency (GHz)	2	10	28	30	38	73
Frame duration (ms)	10	10	10	10	10	10
Subframe duration (ms)	1	1	1	1	1	1
Length of cyclic prefix (μs)	5.2	5.2	5.2	5.2	5.2	5.2
Length of cyclic prefix (μs)	4.7	4.7	4.7	4.7	4.7	4.7
Doppler frequency (kHz)	0.93	4.63	13	14	17.6	33.8
Sub-carrier spacing (kHz)	15	18.8	60	60	71.3	138.8
Length of symbol (μs)	66.7	53.2	16.7	16.7	14	7.2
Number of symbol	7	9	23	23	28	42
Resource block (RB) size (kHz)	180	225.6	720	720	855.6	1665.6
Resource elements per RB	84	108	276	276	336	504
Number of pilot symbols per RB	4	6	12	12	14	22