Unformatted text preview: Calculate its Doppler shift. = 3 x 108/900MHz= .33m = 40000m/.33(cos ) 3.14 A BS has a 900MHz transmitter and a vehicle is moving at the speed of 50 mph. Compute the received carrier frequency if the vehicle is moving (a) Directly toward the BS. d = /cos = - 22.4m/s /.33m = -67.87 r = c + d (9x10 8 ) + 67.8 = 900000067.8 Hz (b) Directly away from the BS. = c- d (9x10 8 ) 67.8 = 899999932.2Hz (c) In a direction that is 60 degrees to the direction of arrival of the transmitted signal. Cos(60) = 1/2 = .5 Doppler Shift = (22.4/.33)(.5) = 67.87 X .5 = 33.93 Hz (9X10 8 ) 33.93 = 899999966.1...
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- Fall '11
- free space, Doppler shift, 900MHz, Darrin Wright