ccorr_test.m

关于通信基本原理的仿真

fbconnection=[0 1 0 0 1];
mseq=m_sequence(fbconnection);

fbconnection1 =[0 0 1 0 1];
fbconnection2 =[0 1 1 1 1];
goldseq=gold_seq(fbconnection1,fbconnection2);

ind1 = find(mseq==0);
mseq(ind1)=-1;
ind2 = find(goldseq==0);
goldseq(ind2)=-1;              %把“0”映射成“ - 1”
r1=ccorr(mseq);
r2=ccorr(goldseq(1,:));
r3=ccorr(goldseq(1,:),goldseq(2,:));
N=length(mseq);
axis=-N+1:N-1;               %定义横轴使自相关峰值移位到0 点
plot(axis,r1,axis,r2,'- .',axis,r3,':');
xlabel('k');
ylabel('R（k）');
title('伪随机序列的相关特性');
legend('m 序列自相关特性','Gold 序列自相关特性','Gold 序列互相关特性');