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   源码介绍

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卷积码编解码

len=length(msg);
%msg = msg';
% check to see if extra zero padding is necessary
if rem(length(msg), k0) > 0
    msg = [msg, zeros(size(1:k0-rem(length(msg),k0)))];
end
n = length(msg)/k0;          % 把输入比特按k0分组，n为所得的组数。
% check the size of matrix g
if rem(size(g, 2), k0) > 0  %列数除以k0
    error('Error, g is not of the right size.');
end
% determine L and n0
L = size(g, 2)/k0;
n0 = size(g, 1);%
% add extra zeros，以保证编码器是从全0开始，并回到全0状态。
u = [zeros(size(1:(L-1)*k0)), msg, zeros(size(1:(L-1)*k0))];
% generate uu, a matrix whose columns are the contents of conv. encoder at
% various clock cycles.
u1 = u(L*k0: -1 :1);
for i = 1:n L-2
    u1 = [u1, u((i L)*k0:-1:i*k0 1)];
end
uu = reshape(u1, L*k0, n L-1);
% determine the output
output = reshape(rem(g*uu, 2), 1, n0*(L n-1));
len_tal = n0*(L n - 1);