IS2012 Homework 4

Due February 4


1. Compute the capacities of the following channels

a. 1 0 b. 0 1 c. 1 1
0 1 1 0 0 0


2. Compute the channel capacity for the channel

0.6 0.4
0.4 0.6


3. For the channel below, write a computer program or a spreadsheet function that will compute the mutual information as a function of the probability p, that a 0 is transmitted. Then plot the function. Either with a program, or "by hand", use the function to find the optimal value of p to 4 decimal places. The value of the mutual information at this value of p is the channel capacity.

0.99 0.2
0.01 0.8