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From: | Tom Golden |
Subject: | Re: [Discuss-gnuradio] Ettus N210 GMSK 9600 |
Date: | Sat, 26 Mar 2016 10:13:22 -0600 |
Hi Tom,
The corr_est block needs to match against the NRZI encoded symbols, so yes I used 7 ones for the hdlc flag.
The HDLC flag has two possible NRZI encodings depending on the initial state:
01111110 - HDLC flag byte
1 00000001 - NRZI encoded HDLC flag byte, initial state 1
01111110 - HDLC flag byte
0 11111110 - NRZI encoded HDLC flag byte, initial state 0
So encoding your two byte sequence:
01111110 00100001
1 00000001 01101011
or
0 11111110 10010100
You should build your corr_est preamble samples based on one of these.
Regards,
Andy
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