The characteristics of wireless signal changes as it travels the transmitter antenna to the receiver

antenna. These characteristics depend upon the distance between the two antennas, the path(s) taken

by the signal, and the environment (buildings and other objects) around the path. The profile of

received signal can be obtained that of the transmitted signal if we havea model of the medium

between the two. This model of the medium is called channel model.-The characteristics of wireless signal changes as it travels　the transmitter antenna to the receiver

antenna.　 These characteristics depend upon the distance between the two antennas, the path(s) taken

by the signal, and the environment (buildings and other objects) around the path. The profile of

received signal can be obtained　that of the transmitted signal if we havea model of the medium

between the two. This model of the medium is called channel model.