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Computer Networking : A Top-Down Approach

Computer Networking : A Top-down Approach

Authors:
James F. Kurose, Keith W. Ross
Exercise:
Problems
Chapter:
Multimedia Networking
Edition:
6
ISBN:
9780132856201
Question:
7

 

Question

Consider the procedure described in Section 7.3 for estimating average delay d i . Suppose that u = 0.1. Let r 1 – t 1 be the most recent sample delay, let r 2 – t 2 be the next most recent sample delay, and so on.

a. For a given audio application suppose four packets have arrived at the receiver with sample delays r 4 – t 4 , r 3 – t 3 , r 2 – t 2 , and r 1 – t 1  Express the estimate of delay d in terms of the four samples.

b. Generalize your formula for n sample delays.

c. For the formula in Part b, let n approach infinity and give the resulting formula. Comment on why this averaging procedure is called an exponen-tial moving average.

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