% AWGN 信道,維特比譯碼,(3,[7,5])卷積碼糾錯性能曲線
Eb_to_Nj_in_dB_Q1=[0,1,2,3,4,5,6,7,8,9,10,11];
Pb_Q1=[0.49906,0.49767,0.5015,0.49875,0.49713,0.49571,0.49417,0.47601,0.35986,6.5425e-2,1.658e-3,2.5e-5];
Eb_to_Nj_in_dB_Q4=[0,1,2,3,4,5,6,7,8,9];
Pb_Q4=[0.49889,0.49912,0.49272,0.49101,0.47666,0.40525,0.18184,0.010715,2.50e-4,1.5e-5];
Eb_to_Nj_in_dB_Q8=[0,1,2,3,4,5,6,7,8];
Pb_Q8=[0.49547,0.49138,0.48168,0.43763,0.36472,0.1508,2.1575e-2,2.0385e-3,6.7e-5];
Eb_to_Nj_in_dB_Q16=[0,1,2,3,4,5,6,7,8];
Pb_Q16=[0.45233,0.41818,0.346,0.2833,0.1722,2.5954e-2,6.3655e-3,7.075e-4,2e-5];

% Draw Pb vs.Nj curves
semilogy(Eb_to_Nj_in_dB_Q1,Pb_Q1,':.',Eb_to_Nj_in_dB_Q4,Pb_Q4,':o',Eb_to_Nj_in_dB_Q8,Pb_Q8,':+',Eb_to_Nj_in_dB_Q16,Pb_Q16,':x');
grid on;
title('AWGN信道下(3,[7,5])卷積碼糾錯的性能曲線');
xlabel('Eb/Nj (dB)');
ylabel('誤碼率 Pb');