qam_mc.m

QAM的蒙特卡洛仿真QAM的蒙特卡洛仿真QAM的蒙特卡洛仿真.

clear all 
echo off 
SNRindB1=0:2:15; 
SNRindB2=0:0.1:15; 
M=4; 
k=log2(M); 
for i=1:length (SNRindB1), 
   smld_err_prb(i)=cm_sm41(SNRindB1(i));       %仿真误符号率 
end; 
for i=1:length (SNRindB2), 
  SNR=exp(SNRindB2(i)*log(10)/10);        %信噪比 
  theo_err_prb(i)=4*Qfunct(sqrt(3*k*SNR/(M-1)));    %理论误符号率 
end; 
%随后绘图曲线% 
semilogy (SNRindB1,smld_err_prb,'*'); 
hold 
semilogy (SNRindB2,theo_err_prb); 
grid on 
xlabel('Eb/No in dB') 
ylabel('error probability') 
title('4QAM系统的蒙特卡罗仿真')