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ECE4833-FINAL06 - ECE 4833 Mobile and Wireless Networks...

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ECE 4833: Mobile and Wireless Networks SPRING 2006 FINAL EXAM 1 May 2006 Dr. I. F. Akyildiz, Distinguished Chair Professor Broadband and Wireless Networking Laboratory School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta, GA 30332 Tel.: 404-894-5141; Fax.: 404-894-7883; E_Mail: [email protected] Open Book Test (Only hard copies of class notes are allowed!!) No laptops or any other devices are permitted. Duration: 3 hrs. All questions have the same weight. Question 1 Assume that we want to deploy an analog FM AMPS system with half band of 15 kHz rather than the existing 30 KHz. Also assume that in analog FM, the signal-to– interference ratio (S/I) requirement is inversely proportional to the square of the bandwidth (4 time increase in S/I for dividing the band into two). a. What is the required S/I in dB for the 15MHz channel if the required S/I for the 30kHz systems is 18dB? b. Determine the frequency reuse factor N needed for the implementation of this 15kHz per user analog cellular system. c. If a service provider had a 12.5MHz band in each direction (up-link and down- link) and it would install 30 antenna sites to provide its service, what would be the maximum number of simultaneous users (capacity) that the system could support in all cells? Neglect the channels that are used for control signaling.
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