|
From: | Henry Barton |
Subject: | Re: [Discuss-gnuradio] Handling of IQ files |
Date: | Sun, 20 Mar 2016 16:45:38 +0000 |
So correlating is digitally mixing something with a predetermined sequence? I’ve been struggling to figure out what correlation means and this seems right. I guess, then, if you have a PSK waveform you might multiply it by something, starting at various offsets in the signal, to try and decode it? Sent from Windows Mail Yes, pretty much. With the DFT (and the continuous one) you are correlating
the input waveform with harmonically related, complex sinusoids; essentially for each harmonic you mix it down to DC then sum (integrate). The FFT is different (I actually don't know how it works, other than it operates on 2^n samples), but the output is the same. Lou Henry Barton wrote > I’ve read up on the FFT and DSP and I must say I’m impressed that > multiplying two waveforms is the digital equivalent of heterodyning. Am I > right in my understanding that finding frequency components (FFT-ing) is > simply multiplying a series of known sine waves by your input waveform? -- View this message in context: http://gnuradio.4.n7.nabble.com/Handling-of-IQ-files-tp58915p58935.html Sent from the GnuRadio mailing list archive at Nabble.com. _______________________________________________ Discuss-gnuradio mailing list address@hidden https://lists.gnu.org/mailman/listinfo/discuss-gnuradio |
[Prev in Thread] | Current Thread | [Next in Thread] |