mseries.m

在DS-spread spectrum系统中,噪声为加性高斯白噪声,传统单用户检测,线性解相关多用户检测和最小均方误差多用户检测的性能比较

function mseq = mseries(coefficients)
len=length(coefficients);
L=2^len-1;%所需的移位寄存器的长度
registers=[zeros(1,len-1),1]; %初始寄存器内容
mseq(1)=registers(1);
for i= 2:L
    newregisters(1:len-1) = registers(2:len);
    newregisters(len) = mod(sum(coefficients.*registers),2);
    registers=newregisters;
    mseq(i)=registers(1);
end
mseq(find(mseq>0)) = -1;
mseq(find(mseq>-1)) = 1;
for i=1:L
mseqtemp(i,:)=mseq;
temp=mseq(1);
for j=1:L-1
mseq(j)=mseq(j+1);
end
mseq(L)=temp;
end
mseq=mseqtemp;