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Unformatted text preview: Lecture 13 - EE 359: Wireless Communications - Fall 2005 MIDTERM This exam is open book and notes, and calculators are needed. Please state all assumptions used in your calculations. You may use any derivations or statements from the book as long as you cite where they come from. Graded exams and solutions will be available later this week. Good Luck! Problem 1 (40 points): Wireless Channels. Consider the wireless channel shown in the figure below, which consists of a LOS path and one multipath component for each distance d between the transmitter and receiver. In particular, for every distance d , there is a single reflector which gives rise to a single multipath component at an arrival angle of 45 degrees (the figure shows the reflector giving rise to the multipath component for a given distance d ). Assume the receiver is traveling at 30 Km/hr in a straight line directly away from the transmitter, the transmitted power is 10W, and the carrier frequency is 2 GHz. Also assume the antennas at the transmitter and receiver are nondirectional (0 dB antenna gain) and are the same height above the ground, h r = h t = 6 m. s(t) r(t) 45 o 30 Km/hr d h t h r (a) Find the approximate distance d * where the two signal paths first cause direct cancellation to each other.each other....
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This note was uploaded on 08/05/2008 for the course EE 359 taught by Professor Goldsmith during the Spring '08 term at Stanford.
- Spring '08