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Greetings, Could anybody tell me if FFT works for complex sequences, and how to do it? If it doesn't, what other ways are available? Thx! mu |
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FFT for complex data sequence
Started by ●January 14, 2004
Reply by ●January 15, 20042004-01-15
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Hi Mu, Yes the Matlab fft function does handle complex sequences. I know some applications require you to use a complex fft function, but not Matlab. If your data is already complex simply use X = fft(x,fft_size), where x is your complex sequence and fft_size is the number of points in your fft. Similarly if you want to create a complex input from say I & Q from a comms system, simply use the complex function first. Jeff -----Original Message----- From: mao mu [mailto:] Sent: Wednesday, January 14, 2004 8:51 PM To: Subject: [matlab] FFT for complex data sequence Greetings, Could anybody tell me if FFT works for complex sequences, and how to do it? If it doesn't, what other ways are available? Thx! mu _____________________________________ Note: If you do a simple "reply" with your email client, only the author of this message will receive your answer. You need to do a "reply all" if you want your answer to be distributed to the entire group. _____________________________________ About this discussion group: To Join: To Post: To Leave: Archives: http://www.yahoogroups.com/group/matlab More DSP-Related Groups: http://www.dsprelated.com/groups.php3 |
Reply by ●January 15, 20042004-01-15
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Hi, Maltab can perform FFT operation on complex sequences. ( fft command). In case you wanted to implement FFT in C then you would need to separate the real terms and imaginary terms. You can refer to the book "Numerical Recipies in C" for details on the algorithm. regards, Abhijit --- In , mao mu <maomu2003@y...> wrote: > Greetings, > Could anybody tell me if FFT works for complex sequences, and how to do it? > If it doesn't, what other ways are available? Thx! > mu |
Reply by ●January 16, 20042004-01-16
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Abhijit- > > Could anybody tell me if FFT works for complex sequences, and how > > to do it? > > If it doesn't, what other ways are available? Thx! > Maltab can perform FFT operation on complex sequences. ( fft command). > > In case you wanted to implement FFT in C then you would need to > separate the real terms and imaginary terms. You can refer to the > book "Numerical Recipies in C" for details on the algorithm. Another excellent FFT book is: The Fast Fourier Transform and its Applications E Oran Brigham ISBN 0-13-307505-2 Jeff Brower system engineer Signalogic |
