m_sequence.m

此函数用来生成最大长度线性移位寄存器序列(m序列)

%生成5阶m序列
function [mseq]=m_sequence(fbconnection)
fbconnection=[0 1 0 0 1];
n=length(fbconnection);   %n为移位寄存器级数
N=2^n-1;                  %N为m序列周期
register=[zeros(1,n-1) 1];  %移位寄存器的初始状态
mseq(1)=register(n);        %m序列的第一个输出码元
for i=2:N
    newregister(1)=mod(sum(fbconnection.*register),2);
    for j=2:n,
        newregister(j)=register(j-1);
    end;
    register=newregister;
    mseq(i)=register(n);
end