bound_awgn_r12_k3.m

能够测试不同码率（1/2,1/3）的卷积码在awgn信道下的性能

% Name: bound_AWGN_conv_R12_K3.m
% Date: October 19, 2005
% Description:
% Bound for a binary K=3 rate-1/2 convolutional code with ML decoding.
% Binary modulation over an AWGN channel.
%
% Copyright (c) 2005. Robert Morelos-Zaragoza. All rights reserved.

clear
rate=1/2;
df=5;
SNRinit = 0;
SNRinc = 0.5;
SNRfinal = 10;
SNR = [];
Pb = [];
pv = [];

for SNRdB = SNRinit:SNRinc:SNRfinal 
    EbN0 = rate*(10.^(SNRdB/10));
    x = exp(-EbN0);
    Pb1 = Q(sqrt(2*df*EbN0))*exp(df*EbN0)*x^5/((1-2*x)^2);
    Pb = [Pb Pb1];
    SNR = [SNR SNRdB];
end

semilogy (SNR,Pb,'-rs');                          % Plot bit error rate
hold on