Besides the tips mentioned in the previous mails, I am wondering if the carrier recovery can performed by adding proper preamble fore the burst mode bpsk communication. Several books mentioned that but did not provide more details;
for example: Radio System Design for Telecommunication By Roger L. Freeman page 417. Satellite Communication By Dharma Raj Cheruku page 138 Especially the latter book, a preamble with 352 bits are used as carrier recovery, which is much faster than the my current FLL. I am wondering if any guy who have similar implementation. On Wed, Mar 6, 2013 at 7:08 AM, Tom Rondeau <t...@trondeau.com> wrote: > On Wed, Mar 6, 2013 at 6:42 AM, Sreeraj Rajendran > <srees4sr...@yahoo.co.in> wrote: > > > >>>I don't believe this problem can be solved by adjusting the loop > >>> bandwidth. > > > > Acquisition time is roughly inversely proportional to loop_bw and error > > variance is proportional to loop_bw. So there is always a tradeoff > between > > acquisition time and tracking performance. You should try adjusting > loop_bw > > (http://www.trondeau.com/blog/2011/8/13/control-loop-gain-values.html). > > > >>>Applying faster tracking algorithm may solve this problem, but I think > it > >>> takes long time to develop for a new guy. > > > > If you have a good understanding of the algorithm, its really easy to > > prototype the alogorithm in GRC or by using gnuradio python-block coding > > support. "gr_modtool" is always there to make block coding easier. > > > > -Sreeraj > > > Also hand tune to make sure the frequencies of the transmitter and > receiver are as close as you can get them. The slowest loop in this > chain is the frequency lock loop, so overcome that by hand and see > what happens. > > Tom > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > -- Alex, *Dreams can come true – just believe.*
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