powcal.m

LDPC码的编解码Matlab仿真 希望对大家有用

function p=powcal(x)
%%%% this function calculate the power of the input data
%%%% Usage: p=powcal(x);
if nargin~=1
    error('Usage: p=powcal(x).');
    return
end
[m,n]=size(x);
N=m;
x2=x.*x;
y=sum(x2,1);
p=y/N;