On Sun, Mar 11, 2007 at 02:59:58PM -0700, Johnathan Corgan wrote: > Achilleas Anastasopoulos wrote: > > > Regarding protecting the length field, a rate 1/2 linear block code > > can always be used. > > > > The way it is now it is a repetition code which offers little > > protection. > > As-is there is no FEC in in the digital packet code anyway. When we add > that, we'll likely do it for the complete header and payload at the same > time.
I don't think so. We need to be able to reliably determine the length of the packet (which we get from the header), to find the end of the packet. I think Achilleas' suggestion of a rate 1/2 block code for the header is the way to go. Achilleas, do you have a specific suggestion? Golay would protect 12-bits. Any off-the-shelf code that does a good job on 16-bits of payload? Also, splitting the PHY layer framing from the handling of the payload CRC / FEC allows upper layers to be independent of the low-level framing mechanism. Eric _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
