7.m

维特比编解码

msg_gr_demod = ddemodce(msg_rx, Fd, [Fs, pi/4], 'psk', M);
	[dummy graydecod] = sort(grayencod); graydecod = graydecod - 1;
	msg_demod = graydecod(msg_gr_demod+1)';
    msg_demod_bi = de2bi(msg_demod,k)' ; msg_demod_bi =  msg_demod_bi(:);
	stem(tEnc, msg_enc_bi(1:numEncPlot),'rx'); hold on;  
	stem(tEnc, msg_demod_bi(1:numEncPlot),'bo'); hold off; 
	axis([ 0 numPlot -0.2 1.2]);  xlabel('Time'); ylabel('Amplitude'); title('Demodulated Symbols' );