gold.m

由MLS产生Gold码序列,<通信原理与Matlab仿真>经典范例

connections1=[1 0 1 0 0 0]; %m序列连接
connections2=[1 1 1 0 1 0];
seq_1=m_seq(connections1);  %产生一对等长的m序列
seq_2=m_seq(connections2);

L=2^length(connections1)-1; %m序列周期
for shift_amount=0:L-1
    temp=[seq_2(shift_amount+1:L) seq_2(1:shift_amount)];
    gold_seq(shift_amount+1,:)=(seq_1+temp)-floor((seq_1+temp)./2).*2;
  
end
plot(gold_seq);

figure(2);
plot((abs(fft(gold_seq))));
%相关特性%
max_cross_corr=0;
for i=1:L-1
    for j=i+1:L;
        c1=2*gold_seq(i,:)-1;
        c2=2*gold_seq(j,:)-1;  
          for m=0:L-1
              shift_c2=[c2(m+1:L) c2(1:m)];
              corr=abs(sum(c1.*shift_c2));
                 if (corr>max_cross_corr)
                     max_cross_corr=corr;
                 end
          end
     end
end