A GSM cellular telephone system operates at a downlink frequency of 935-960 MHz, with a channel bandwidth of 200 kHz, and a base station that transmits with an EIRP of 20 W. The mobile receiver has an antenna with a gain of 0 dBi and a noise temperature of 450 K, and the receiver has a noise figure of 8 dB. Find the maximum operating range if the required minimum SNR at the output of the receiver is 10 dB, and a link margin of 30 dB is required to account for propagation into vehicles, buildings, and urban areas