qam.m

高斯噪声下的64QAM调制的误码率检测与理论值比较

            %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
            %   对M=64的QAM系统进行蒙特卡罗仿真   %
            %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
clear all
echo off
SNRindB1=0:2:15;
SNRindB2=0:0.1:15;
M=64;
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('64QAM系统的蒙特卡罗仿真')
%gtext('（注：“—”理论误符号率；“*”仿真误符号率）')