This preview shows page 1. Sign up to view the full content.
Unformatted text preview: ) of Y under the constraint E [ X 2 1 ] = P 1 , E [ X 2 2 ] = P 2 . (a) if X 1 and X 2 are independent. (b) if X 1 and X 2 are allowed to be dependent. 5. Let the input random variable X to a channel be uniformly distributed over the interval-1 2 ≤ x ≤ + 1 2 . Let the output of the channel be Y = X + Z , where the noise random variable is uniformly distributed over the interval-a 2 ≤ z ≤ + a 2 . (a) ±ind I ( X ; Y ) as a function of a . (b) ±or a = 1 ³nd the capacity of the channel when the input X is peak-limited; that is, the range of X is limited to-1 2 ≤ x ≤ + 1 2 . What probability distribution on X maximizes the mutual information I ( X ; Y )? (c) [Optional] ±ind the capacity of the channel for all values of a , again assuming that the range of X is limited to-1 2 ≤ x ≤ + 1 2 . 1...
View Full Document
This note was uploaded on 12/01/2010 for the course ADLAC 1023 at Stanford.