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

Table 2

List of symbols used in this paper.

Symbol	Quantity
	Width of the rectangular tunnel
h	Height of the rectangular tunnel
(x0, y0, 0)	Coordinate of the antenna of the wireless device
(x1, y1, z1)	Coordinate of the antenna of the user
m, n	Order of the waveguide mode
	Wavelength
Lmn	Path loss of the (m, n) mode
Copmn	Coupling loss of signal power at both the transmitting and receiving antennas
MAFmn	Power loss of the (m, n) mode as it propagates along the tunnel
	Coupling fraction of the transmitting antenna power along the (m, n) mode
	Coupling fraction of the receiving antenna power along the (m, n) mode
	Attenuation coefficient of the (m, n) mode
zDV	Longitudinal coordinate of the location of the dividing point
	Boundary of the zone where the attenuation of the vertically polarized (m, n) mode is larger than that of the horizontally polarized (1,1) mode
	Boundary of the zone where the attenuation of the horizontally polarized (m, n) mode is larger than that of the horizontally polarized (1,1) mode
Pv	Vertically polarized field power
Ph	Horizontally polarized field power
	Power difference between vertical polarization and horizontal polarization
	Mean value of per unit length
p	Pseudoperiod of the field variation
z0.5	Longitudinal coordinate of the location of the observation interval