After performing a time and frequency tuning of a signal, and plotting the result in frequency domain(abs value), the following ripple structure can be witnessed.
The extracted bits are LFSR sequence(row wise bellow).
0 0 0 0 0 0 0 1 1 0 0 1 1 0 0 1 1 0 1 0 0 1 0 1 1 0 1 0 0 0 1 1 1 0 1 0 0 0 1 1 0 1 0 1 1 1 0 0 1 0 1 1 1 0 1 0 1 1 0 1 1 1 1 1 0 1 1 1 1 0 1 0 1 0 1 1 1 1 1 1 0 1 1 1 0 1 0 1 0 1 0 0 0 0 0 1 0 0 0 1 0 0 1 1 0 0 0 1 1 0 1 1 0 1 0 0 1 1 1 1 0 1 0 0 0 1 1 1 1 1 1 0 1 1 0 0 0 0 0 0 0 0 1 0 1 1 0 0 1 1 0 0 1 0 0 0 0 1 1 1 1 0 0 0 1 1 0 0 0 0 0 0 1 1 0 1 0 0 1 1 0 0 1 0 1 1 1 0 0 0 0 1 1 1 0 1 0 1 1 0 0 1 0 1 0 0 0 1 0 1 1 0 1 1 1 0 0 1 0 0 0 0 1 0 1 0 0 1 0 0 1 1 0 1 1 1 0 0 0 1 1 1 1 0 1 0 1 1 0 0 0 0 0 0 1 0 0 0 0 1 1 0 0 1 1 1 0 0 1 1 1 1 0 0 0 0 0 1 1 1 1 1 1 0 0 1 1 0 1 0 1 0 1 0 0 1 0 1 1 1 0 1 1 1 0 0 0 1 0 1 0 0 0 0 0 1 1 0 1 1 1 0 0 1 1 0 1 0 0 0 0 0 1 1 1 1 0 1 1 0 0 1 1 1 1 1 1 0 1 0 0 1 0 1 0 1 0 1 1 1 0 0 0 1 0 0 0 1 0 1 0 0 1 1 1 0 0 1 0 0 0 1 1 1 1 1 0 0 0 1 1 0 1 0 1 0 1 1 0 0 0 0 1 0 0 0 1 0 1 1 0 0 1 0 0 1 1 1 0 1 0 0 1 0 0 1 0 1 0 0 0 1
BPSK modulation is used. Total number of SCs used in Preamble - 432.
Seems that this structure is intended by design. Wondered what may be the reason for such preamble design.
Thanks in Advance.
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