MATLAB模拟2ASK调制误码率与信噪比关系曲线的程序(最新整理)

1、%模拟 2ask% pe=zeros(1,26); jishu=1;for snr=-10:0.5:15 max = 10000;s=round(rand(1,max);%长度为 max 的随机二进制序列f=100;%载波频率nsamp = 1000;每个载波的取样点数tc=0:2*pi/999:2*pi;tc 的个数应与 nsamp 相同cm=zeros(1,nsamp*max); cp=zeros(1,nsamp*max); mod=zeros(1,nsamp*max);for n=1:max;if s(n)=0;m=zeros(1,nsamp); b=zeros(1,nsamp);els

2、e if s(n)=1;m=ones(1,nsamp); b=ones(1,nsamp); endendc = sin(f*tc);cm(n-1)*nsamp+1:n*nsamp)=m; cp(n-1)*nsamp+1:n*nsamp)=b; mod(n-1)*nsamp+1:n*nsamp)=c;endtiaoz=cm.*mod;%2ask 调制t = linspace(0,length(s),length(s)*nsamp);tz=awgn(tiaoz,snr);%信号 tiaoz 中加入白噪声，信噪比为 snr=10db jiet = 2*mod.*tz;%相干解调n,wn=buttor

3、d(0.2,0.3,1,15);b,a=butter(n,wn); dpsk=filter(b,a,jiet);%低通滤波% 抽样判决，判决门限为 0.5 depsk = zeros(1,nsamp*max);for m = nsamp/2:nsamp:nsamp*max; if dpsk(m) = 0.5; for i = 1:nsampdepsk(m-500)+i) = 1;endendend endwrong=0;for i=1:length(cp);if cp(i)=depsk(i); wrong=wrong+1;endendendpe(jishu)=wrong/length(cp);

4、 jishu=jishu+1;snr=-10:0.5:15;semilogy(snr,pe,*);%理论计算snr=-10:0.1:15;pet=0.5*erfc(10.(snr/10)/4).0.5); hold on;semilogy(snr,pet); xlabel(snr/db);ylabel(p_e);legend(模拟结果,理论值);“”“”at the end, xiao bian gives you a passage. minand once said, people who learn to learn are very happy people. in every won

5、derful life, learning is an eternal theme. as a professional clerical and teaching position, i understand the importance of continuous learning, life is diligent, nothing can be gained, only continuous learning can achieve better self. only by constantly learning and mastering the latest relevant knowledge, can employees from all walks of life keep up with the pace of enterprise development and innovate to meet the needs of the market. this document is also edited by my studio profession