The NLOS communications used to communicate with the same mobile network. transmitter to reach the receiver, whether it is spread in a straight line. Or reflected by any obstacles resulting from the reflection of signals from several directions. Will affect the overall strength of the signal at the receiver is. Less than a shuttle LOS series also resulted in the shape of a wrong signal to increase. Due to the interference of signals coming from different directions and at different units. This phenomenon is called the Multi-path Fading.