Q: The downlink (base station to mobile unit) for an 800MHz AMPS cellular system has the following parameters:
Transmitter power, Pt|dB=35W

Loss between Tx and antenna, L=3dB

Tx antenna gain, Gt|dB=10dBd

Rx antenna gain, Gr|dB=2.9dBd

Rx noise bandwith, BW=30KHz

Rx noise figure, F|dB=9dB

The noise temperature at the receiver antenna terminals is T0=290K. The equipment and environment suggest that 6dB of margin be used to assure performance under all conditions. For reliable voice communications, a received signal should be 17dB above the noise. What is the maximum range between a mobile unit and base station to ensure good communications?

(the book is Introduction To Wireless Systems by Bruce A. Black..)


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