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ECE4500_Homework8_solutions

# ECE4500_Homework8_solutions - Virginia Tech ECE 4500 Spring...

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Virginia Tech ECE 4500 Spring 2009 Homework 8 Due at 11:59 p.m. (EDT) on May 3 Name: ________ SOLUTIONS ____________________ ID Number: __________________________ Instructions: Enter your answers into a single Word or PDF document. Show your work to a reasonable extent, and clearly indicate your answers . Instructions for submitting your work will be provided at Blackboard. 1. Propagation delays at the physical layer. a) Consider a communications satellite in geosynchronous orbit. It sits approximately 35,786 km above the earth’s equator. What is the transmission delay that would be expected for a data packet to travel from one ground station to another via this satellite? (You may make the simplifying assumption that the data packet travels at the speed of light in a vacuum.) The speed of light is commonly approximated as c = 3 x 10 8 m/s. The station-to-station transmission delay is 2 times the propagation time from the earth to the satellite: 2 x (35,786,000 m) / (3 x 10 8 m/s) = 0.24 seconds

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ECE4500_Homework8_solutions - Virginia Tech ECE 4500 Spring...

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