713ps5 - PROBLEM SET 5 ECE 713 Spring Quarter 2006...

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PROBLEM SET 5 ECE 713 Spring Quarter 2006 Assigned: May 8th Quiz: May 19th Instructor: Joel Johnson Problem 1 A cellular phone user in a rural area transmits at 835 MHz in a bandwidth of 30 kHz on the link from the handset to the basestation. Assume the handset at 1.5 m height has an antenna gain of 1.5 dBi, a transmit power of 0.5 W, and is located 10 km from the basestation. The basestation at height 50 m has an antenna gain of 6 dBi in the direction of the receiver, and a receiver noise figure of 6.1. The system operates in a 290K external noise environment, and requires a signal to noise ratio at the receiver of 6 in order to function. Assume the transmitter and receiver are polarization and impedance matched. (a) Find the power received at the base station assuming (i) free space propagation (ii) direct plus reflected (flat-Earth) propagation. (b) Find the power received at the base station using the (i) Hata and (ii) Lee models. How do these predictions compare with each other and with those from part (a)? (c) It is known that slow fading effects are present with a standard deviation of 5 dB in path loss.
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713ps5 - PROBLEM SET 5 ECE 713 Spring Quarter 2006...

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