Q function

Discussion in 'Homework Help' started by dalam, Jan 15, 2015.

  1. dalam

    Thread Starter Member

    Aug 9, 2014
    58
    6
    Can I define BER(Bit Error Rate) by using Q function as Q[(x-μ)/σ] ?
    Here x is a random variable, μ is mean and σ is standard deviation.
    I was solving a question on Bit error rate and I encountered this expression.
    Any help will be highly appreciated. I know it is not circuits but I need some help.
     
  2. WBahn

    Moderator

    Mar 31, 2012
    17,757
    4,800
    How can we help when you haven't given a problem, let alone shown your best efforts to work it?
     
  3. dalam

    Thread Starter Member

    Aug 9, 2014
    58
    6
  4. dalam

    Thread Starter Member

    Aug 9, 2014
    58
    6
    I solved it as follows:
    Q((X-0)/1) as mean is zero and the variance is 1 for the first case. So as we can approximate the Q function I used the integration to find value of a( 6.0697).
    In the second case mean is 0.3*X so the Q function becomes Q(0.7X) and I again used integration to find the BER to be 1.2*10^-4.
     
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