Optimization of Wireless Communication Coverage in Underground Tunnels Based on Zone Division

Table 8

List of coverage schemes for comparison.

Coverage scheme	Description
Strategy-H [11, 13]	Coverage without zone division; use the horizontally polarized antennas
Strategy-V [12]	Coverage without zone division; use the vertically polarized antennas
Strategy-MM	Coverage with zone division by using MM
Strategy-SM	Coverage with zone division by using SM
Strategy-FBP	Coverage with zone division by using FBP [16–20]
Strategy-SI-H	Coverage with zone division by using SI [21, 22]; SI is performed based on the horizontally polarized field
Strategy-SI-V	Coverage with zone division by using SI [21, 22]; SI is performed based on the vertically polarized field