time domain and frequency domain

Dear fellows,i am facing problem in my code below.Problem is that signal in time domain does not give me correct value of N,i mean value of N should be like 2^N.Please anyone can solve this issue,and also bit confuse to calculate by data rate,frequency and time(tvec) is in second or milisecond or microsecond.I am not so much good in these things thanks in advance.Please do not change value of tvec(0-0.1).

OR

If anyone has code wich is similar to my results in time domain and frequency domain then please share it to me.

clc,close all,clear all

codn=100;

fs=36000;

bode=1000;

code=round(rand(1,codn));

code_len=round(1/bode/(1/fs))

for ii=1:codn

x((ii-1)*code_len+1:code_len*ii)=code(ii)

end

x2 = x-(1/2) % get rid of most of the dc peak

% set up time and frequency arrays

N = length(x)

delt = 1/fs;

delf = fs/N

tvec = (1:N)*delt

fvec = (-N/2:N/2-1)*delf ; % shifted frequency array

figure(1)

plot(tvec,x2(1,:)+0.5)

title('orignal baseband')

xlabel('time');

ylabel('amplitude')

ylim([-1 1.5]);

y = fftshift(fft(x2)/N);

z=abs(y);

figure(2)

plot(fvec,abs(y))

title('FFT')

xlabel('frequency')

ylabel('amplitude')

Answer 1

[Daniel M]

Code looks fine to me. Not sure what you mean by N being 2^N. The only thing I would tweak is setting

tvec = (0:N-1)*delt;

As for your units of fvec and tvec, they are all based off of fs. If that is in Hz then fvec is in Hz and tvec is in seconds.

[imran khan]

Dear daniel brother i am thankful to you that you always help me,but way you suggest my problem is not solution of my problem.Moreover, i am attaching a file which shows my complete problem.

[Daniel M]

You need to stop opening new questions that are repeats of your other questions. Especially when you still don't follow any of the advice you're given. I can't help you. It's like talking to a brick wall.

[imran khan]

I follow all your advices but none of your advices solve my problem.I use your instructions but no change on my results if you cant believe then you can implement your instruction on my code.last advice which you have given to me as follows

tvec = (0:N-1)*delt;

It has same meaning which i use in my code right.

[Daniel M]

I'm talking about the several other questions you have posted. Myself and others have given you plenty of advice that you have not implemented, or have given feedback on. In this particular question you don't even specify what you want. I get the feeling that you don't know what you want. If you did, you would be able to explain it properly.

[imran khan]

ok take care