2.m

维特比编解码

	Fd = 1; Fs = 4; N = Fs/Fd; numSymb = 100; numPlot = 20;
	SNRpBitDemo = 3; SNR = SNRpBitDemo*k;                     
	seed = [12345678 87654321];              
	rand('state', seed(1));  randn('state', seed(2));              
	msg_orig = randsrc(numSymb,1,[0:1]);                      
	stem([0:numPlot-1], msg_orig(1:numPlot),'bx');                      
	axis([ 0 numPlot -0.2 1.2]);  xlabel('Time'); ylabel('Amplitude');
    title('Binary Symbols Before Convolutional Encoding' );