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well since you have 80% zeros, off the top of my head Run Length Encoding seems to be a good idea.... check this out: Run-length encoding - Wikipedia, the free encyclopedia
is 't' your trellis? and what 'tb' are you using? and since you're essentially doing a bpsk demod with pskdemod(b2,2), try doing a slice to implement hard decision bpsk demod (demodout = (b2>0) ), or use b3 = real(b3) in your code.. post the answers you find, and we'll discuss further.
specifics please.. how have you "converted" the images? is it just append and linearize (eg, in matlab, x_vec = x_mat(:).') ? and what exactly do you mean by "combine"?
well one thing I can think of off the top of my head is to goto the task manager, matlab process, and set priority as high or realtime, and assign an affinity to the process. although I do not recommend it. Windows is multitasking, and will assign as much cpu as required to the process (the...
Re: sos please
a) I'm assuming you mean a stem plot..
x = [1,-2,0,3,0,2,-1];
n = -3:3;
stem(n,x);
b) type "help conv" in matlab console.
c) follow steps in a).
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