ECE 6604 Midterm: ECE 6604 GT Exam10
15 Feb 2019
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Tuesday may 6, 11:30am - 2:20pm: attempt all questions, all questions are of equal value, open book, open notes, exam. 1a) 5 marks: the lcr at the normalized threshold for a 2-d isotropic scattering channel can be expressed as. = (cid:2)e[ 2] is the rms envelope level: find the normalized threshold level o at which the lcr reaches its max- imum value, explain why the lcr at decreases as deviates from o. 1b) 5 marks: consider a cellular system with a carrier frequency of 2 ghz. Sup- pose that the user is in a vehicle travelling at 60 km/h. Gg( ) = (cid:3) 0. 5[1 + cos(2 /t )] , Here we consider the e ects of path loss and shadowing and ignore multipath- fading. Suppose that the received signal power corresponding to the link with the ith base-station, pi, has the probability density function p pi (dbm)(x) = The pi are assumed to be statistically independent.
