Perform the calculations for the forward link of Example 4-8 also for operation at 1900 MHz. Assume the base station transmits 20 W and the handheld terminal has an antenna temperature of 290 K and a receiver input noise temperature of 1500 K. Assume the transmit antenna is impedance matched to its transmission line.
A Cell Phone Reverse Link Here we consider a typical cell phone reverse link (uplink) from a handset to a base station with a sector antenna. The handset transmits at 1900 MHz with 300 mW of power into a -1-dB gain, vertically-polarized omnidirectional antenna with a VSWR of 3. The antenna on a base station tower 8 km away has a slant 45 linear polarization, a 6 elevation beamwidth, and a 90 azimuth beamwidth. It is desired to calculate the power available from the receive antenna. First, the base station receive antenna gain is found using (4-57) to be Gr ¼ 16:8 dB and is impedance matched. The impedance mismatch loss at the transmitter from (4-43) in (4-41) is q ¼ 0:75 and the polarization mismatch loss from (4-47) is p = 0:5 Using a 1/R4 distance variation, which is typical for many propagation scenarios.
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