LOS and non LOS in WiMax

WiMax is BWA standard that can work in Line of Sight (LOS) and non Line of Sight (non LOS) with the speed 70 Mbps (non LOS) up to 134 Mbps (LOS).

The LOS is the electromagnetic wave that goes in the straight line. This wave will go maximally if the zone passed by the wave is not blocked by obstacles known as Zone Fresnel 1. You can see the illustration below :


The non LOS is the electromagnetic wave that goes in straigt line but it is blocked by obstacles so the received signal is direct wave and reflected wave. Please see the picture below for better understanding :