find the mean, energy and power of cosine function

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Passband Modulation
评论： Abdullah Zubair 2020-2-21
i am just a matlab beginner.
x[n]=2cos(0.2*pi*n) with a length of N =100 , that is, ,0<N<99 plotted
clear all
n=[0:99];
x=2*cos(0.2*pi*n);
stem(n,x);
legend('x[n]');
title('Sequence of 2*cos(0.2*pi*n)');
xlabel('n');
ylabel('x[n]');
axis([0 99 -2 2]);
how to use MATLAB to compute the mean, and energy and power of x[n]given mean=x, energy=Ex and power=Px.

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采纳的回答

Wayne King
Wayne King 2012-9-21
编辑：Wayne King 2012-9-21
You can just do:
mean(x)
Ex = norm(x,2)^2 % the energy
Px = 1/numel(x)*norm(x,2)^2 % power
If you don't want to use norm(), you just use sum()
Ex = sum(abs(x).^2)
Px = 1/numel(x)*sum(abs(x).^2)
Note that the RMS of the signal is
sqrt(Px)
The Signal Processing Toolbox implements this as rms()
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Walter Roberson
Walter Roberson 2013-12-18
pinak parida commented,
power ,energy of a signal how norm works to be check?
Abdullah Zubair
Abdullah Zubair 2020-2-21
mean(x)
Ex = norm(x,2)^2 % the energy
Px = 1/numel(x)*norm(x,2)^2 % power
what is this 2 in norm function is for?

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