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维特比编解码

SNRpBit=[4.5:.5:7];
linSNRpB=10.^(SNRpBit(:).*0.1);
M=4;codeRate=1/2;
constlen=7;k=log2(M);
dist=[[10:16];
numErr=[36 0 211 0 1 404 0 11633];
expBER=0.5.*erfc(sqrt(linSNRpB*codeRate));
expVitBER=vitproberrdemo(expBER,dist,numErr);
semilogy(SNRpBit,expViBER,'g-');xlabel('Eb/No per bit(dB)');ylabel('BER');
title('Performance for R=1/2,K=7 Conv.Code and QPSK with Hard Decision');grid on;
axis([4 8 10e-7 10e-3]);legend('Union Bound',0);