clc;
clear;
M = 2; %确定MPSK的进制
nPacket = 516; %信号长度
x = randint(1,nPacket,2); %产生调制信号
x=[x 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0];%末尾加0减小误差
scty=[1 1 0 1 1 0];%删除图样
trellis=poly2trellis(7,[171,133])
x1=convenc(x,trellis,scty)
x2=bin2dec4(x1);
h = modem.pskmod(4); %产生调制的项目
y = modulate(h,x2); %调制过程
ratio_temp=zeros(1,15);
number=zeros(1,15);
SNRindB2=1:1:15;
for i=1:length(SNRindB2)
SNR=10^(SNRindB2(i)/10);
theo_err_prb(i)=2*Qfunc(sqrt(4*SNR)/2);
end
yshibu=real(y);
yxubu=imag(y);
y(yshibu==1 & yxubu==0)=1+1*1i;
y(yxubu>=0 & yxubu==1)=1+-1*1i;
y(yshibu<=0 & yxubu==-1)=-1+-1*1i;
y(yxubu==-1 & yxubu>=0)=-1+1*1i;
for i=1:1:15
yn = awgn(y,i,'measured'); %通过高斯信道,信噪比SNR=15dB
ynshibu=real(yn);
ynxubu=imag(yn);
[z1,shibu]=quantiz(ynshibu,[-1:.3:1],[7 6 5 4 3 2 1 0]);%实部量化电平
[z2,xubu]=quantiz(ynxubu,[-1:.3:1],[7 6 5 4 3 2 1 0]);%虚部量化电平
z(1:2:2*length(shibu)-1)=shibu; %实部插入
z(2:2:2*length(shibu))=xubu; %虚部插入
tblen=15;
nsdec=3;
decoded=vitdec(z,trellis,tblen,'term','soft',nsdec,scty)
[number,ratio]= biterr(x,decoded) %得到误符号数和误码率
ratio_temp(i)=ratio;
end
semilogy(SNRindB2, theo_err_prb,1:1:15,ratio_temp,'-o')
axis([0 15 0.00001 1])
xlabel('SNR in dB')
ylabel('Prb of Err')
legend('理论','仿真')
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温馨提示
Matlab高斯信道条件下采用QPSK和8PSK时点到点通信系统的理论和统计所得的误码率和误比特率曲线。删余卷积码的Pb性能仿真加入信道编码模块,绘制误比特率曲线进行软判决和应判决,和用3/4、7/8删余码进行编码等。
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