?? qam.m
字號:
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% 對M=64的QAM系統進行蒙特卡羅仿真 %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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)); %仿真誤符號率
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))); %理論誤符號率
end;
%%%%%%%隨后繪圖曲線%%%%%%%
semilogy (SNRindB1,smld_err_prb,'*');
hold
semilogy (SNRindB2,theo_err_prb);
grid on
xlabel('Eb/No in dB')
ylabel('error probability')
title('64QAM系統的蒙特卡羅仿真')
%gtext('(注:“—”理論誤符號率;“*”仿真誤符號率)')
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