9. Consider an 1800 MHz mobile radio system for cellular communication. The base station is at a height of 3 m above the ground and the mobile at 1 m. The gain of the base station antenna is 6 dBi and for the mobile antenna, the gain is 2 dBi. It is required to determine the minimum transmitted power in order for the BS to serve a mobile at a distance of 1000 m in a Line-of-sight communication link. The received power is -104 dBm.