Keyholes in MIMO-OFDM: Train-to-Wayside Communications in Railway Tunnels

Table 2

(bps/Hz) for VV, VH, HV, and HH polarization setups for both antenna separations considered ( and ).

Antenna distance/polarization	VV	HV	VH	HH	Average
	7.23	7.15	6.82	6.78	7.00
	6.79	6.91	6.68	6.66	6.76