How to simulate NLOS in a room using 4 Transmitters

I would like to request some guidelines in simulation of NLOS in a room

parameters Values

Room Size 5 × 5 × 3 m3

Reflection coefficient 0.8

Source Location (4 LEDs) (1.25, 1.25, 3), (1.25, 3.75, 3), (3.75, 1.25, 3), (3.75, 3.75, 3)

Location (1 LEDs) (2.5, 2.5, 3)

Semiangle at half power (FWHM) 70

Transmitted power (per LED) 20 mW

Number of LEDs per array 60 × 60 (3600)

Centre luminous intensity 300–910 lx

Receive Receive plane above the floor 0.85 m

Active area (AR) 1 cm2

Half-angle FOV 60

Elevation 90

Azimuth 0

Δt 0.5 ns