mid1_501 - ECE-501 Midterm#1 Introduction to Analog and...

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ECE-501 Introduction to Analog and Digital Communications Winter 2008 Midterm #1 Feb. 6, 2008 MIDTERM #1 EXAMINATION Name: Instructions: Do not turn over this cover page until instructed to do so. You will have 48 minutes to complete this exam. You are allowed to consult the letter-sized piece of paper which you have prepared beforehand. You are not allowed to consult any other books, notes, or oracles. Please write clearly and include sufficient explanation with all of your answers. If you write on the backs of the pages, indicate this so the grader does not miss your work. Do not unstaple the test pages. P. Schniter, 2008 1
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1. (15 pts) In the physical channel model below, assume that the indirect path gain equals 1 / 2 while the direct path gain equals 1. As usual, the speed of light is 3 × 10 8 m/sec. 3 km 6 km s ( t ) x ( t ) (a) Along the direct path, how long (in seconds) does the signal get delayed? Along the indirect path, how long?
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