# FL2008ECE757_Additional Problems_SOL - 3 Find the values of...

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SOLUTIONS UNIVERSITY OF NEW HAMPSHIRE DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING ECE757 - Commmunication Systems FALL 2008 Additional Problems: 1. A rectangle has dimensions that are random variables. The base, X, is a random variable uniformly distributed from 0 to 5. The height, Y, is a random variable uniformly distributed from 0 to X. Find the expected value of the area of the rectangle. 2. In a binary communication system (shown below), a 0 or 1 is transmitted. Because of channel noise, a 0 can be received as a 1 and vice versa. Let m 0 and m 1 denote the events of transmitting 0 and 1, respectively. Let r 0 and r 1 denote the events of receiving 0 and 1, respectively. Let P[m 0 ]=0.5, P[r 1 |m 0 ]=p=0.1, and P[r 0 |m 1 ]=q=0.2 m 0 m 1 P[m 1 ] P[m 0 ] P[r 1 |m 1 ] P[r 0 |m 0 ] P[r 1 |m 0 ] P[r 0 |m 1 ] r 0 r 1 a) Find P[r ] and P[r ] 0 1 b) If a 0 was received, what is the probability that a 0 was sent? c) If a 1 was received, what is the probability that a 1 was sent? d) Calculate the Probability of error P e e) Calculate the probability that the transmitted signal is correctly read at the receiver.

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