NetSim does not allow for walls/obstacles to be directly created in NetSim.
The effect of a wall/obstacle can be 'modeled' by changing the path loss exponent in the channel model.
NetSim wireless medium contains the different Path loss Models. These can be seen by right-clicking on wireless link -> Properties-> path loss models
- Friis Free Space Propagation (Default option in GUI)
- Log Distance - Pathloss Exponenet range from 2 to 5
- HATA Suburban
- HATA Urban
- COST 231 HATA Suburban
- COST 231 HATA Urban
- Indoor Office - Pathloss Exponenet is 2.6
- Indoor Factory - Pathloss Exponent is 2.1
- Indoor Home - Pathloss Exponenet is 3
- No Path Loss
You can choose an appropriate model, or alternatively, you can set the path loss exponent. A high exponent (> 3) leads to higher RF losses while a lower exponent (2 to 3) leads to lesser losses
Otherwise, if you want a specific drop of say 2 dB due to a wall, you can set this value in the antenna gain.
The default value for antenna gain is 0 dBi. It is user-defined and can be set to a negative value by right-clicking on a wireless node and Access Point -> Properties -> Interface (Wireless) -> Physical Layer -> Antenna Gain. And then you can set -2dB which implies 2dB loss.
When modeling the same in 5G, the transmit power can be reduced by an equivalent amount of dB
