Here are four links that contains solution to Stark and Woods exercise problems. A friend of mine sent these links to me when I took Random Signals class. That problem looks very similar to some problems in Stark and Woods. If this book is not your text book, look in it. It might be from one of the example of that book. If that's your text book, you should be able to find the solution in one of these links. http://www.eece.unm.edu/faculty/hayat/eece541_02/hw.htm http://black1.csl.uiuc.edu/~yima/ECE434.html http://www-ece.rice.edu/~riedi/elec533.html http://www.ece.umn.edu/users/georgiou/courses/5531/syll.html Good Luck! Adios, LTU