Re: [Discuss-gnuradio] Ettus N210 GMSK 9600

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

_______________________________________________
Discuss-gnuradio mailing list
Discuss-gnuradio@gnu.org
https://lists.gnu.org/mailman/listinfo/discuss-gnuradio