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I'm new here and hope to have good feedback from you.

I'm trying to blindly demodulate an RF signal and managed to get a sequence of bits for a preamble. After some research, I'm in fact exactly in the same situation as this guy:

OFDM Preamble Ripple Structure in Frequency Domain

My question is: given a bit sequence, how can you derive the LFSR sequence (and initial seed) like he seems to have done here:

https://www.dsprelated.com/thread/2716/semi-blind-ofdm-channel-estimation

Thank you !

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  • $\begingroup$ Can you clarify what is the difference between "bit sequence" and "LFSR sequence"? Do you mean the LFSR that produced the bit sequence? $\endgroup$ – MBaz May 31 at 14:37
  • $\begingroup$ Sorry for the late answer, I'm off for a few days. Yes I wanted to say: how to find the generating LFSR polynom and seed given a demodulated bitstream $\endgroup$ – Fujibayashi Nagato Jun 5 at 16:03
  • $\begingroup$ Dear all, I'm still stuck with that. I've derived a similar sequence than the one described in the referenced post but I still don't see how to find the corresponding generating polynom (apart from brute force ?). Is that even possible ? $\endgroup$ – Fujibayashi Nagato Jun 17 at 7:55

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