# conv and deconv functions

Started by June 16, 2004
 Hi all, I am having problems using the combination of conv and deconv function. I have a large number of random processes which I convolve with its fliped version, then I deconvolve the result obtained from convolution with the fliped version of random process, the procedure works for all but some specific cases. The code below should help you understand the problem. %%%%%%% Code starts %%%%%%%%%%%%%% t_bit-6; r_bit=1/t_bit; fc1= 2*r_bit; n=4; input_stream1=[0 1 0 1]; i=1; j=1; % Value of m depends on the order of the modulation for m=1:n:(length(input_stream1)-n+1) k=1; % Extracting number of bits to be represented in a symbol bit_stream1=input_stream1(1,m:(m+n-1)); dec1=bin_to_dec(bit_stream1); % Calculating phase angle depending on the decimal equivalent theta1(j)1* ((2*pi)/M); for t=(m-1)*t_bit*(1/n):1/(20*fc1):((m+(n-1))*t_bit*(1/n))-(1/ (20*fc1)) % Formulae to find of the M-PSK signal s1(k)=amp1*cos(2*pi*fc1*t + theta1(j)); y(i)=t; i=i+1; k=k+1; end % Convolution fliped_s1=fliplr(s1); r_s1=conv(s1,fliped_s1); % Deconvolution s_1onv(r_s1,fliped_s1); diff = s1 - s_1 end %%%%%%%%% Code ends%%%%%%%%%%%%%%%%% The diff in this case should be zero but it is not, this problem occurs for the input_stream1= 0 1 0 1 and 1 1 0 1 for all other 4 bit combinations the diff is rightly zero. I am trying to find out as to why am I not getting the diff as 0 for all cases. Please can someone help me find out the problem. Thanking you all in anticipation Brijraj