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Need help with communication system problem

  1. Oct 11, 2005 #1
    Ok, so i just started taking a course in Communication systems. So far I am confused. I am never going into communication systems, but i still have to take the required course. I'm going into either Power or Control Systems.

    But anyways, I really need help with this communcation problem:

    Consider a sinusoidal process with random phase, defined by
    X(t)=20cos(40,000,000*pi + theta) where theta is a random variable uniformly distributed over the interval [-2p, 0).

    a) What is the Mean of the process X(t): I know that the mean is u = E[X(t)]

    b) What is the Autocorrelation function of X(t): I know that the autocorrelation is Rx(tau) = E[X(t+tau)X(t)].

    If anyone can give me any hints, i would greatly appreciate it. thank you
  2. jcsd
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