-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 George Nychis wrote: > Was the access code picked randomly, or was there some basic rule of > thumb for generating it? What about the threshold of 12? What about > choosing a 64bit access as opposed to 32bit?
Standards for access codes are interesting. The Barker spreading code use in 802.11 1 and 2Mbps rates, for instance, is one of a set of optimal codes where B (dot) B = |B| while B (dot) (B rotated by any nonzero number of bits) = 1. This means that if you're sliding a correlator along a set of Barker-modulated bits, you get strong peaks at the correct offset and (basically) nothing at any other offset. Usually access codes have a property somewhat like that. I think the nuances of this choice are strongly tied in, however, with what modulation scheme you're using. - -Dan -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFHh5/0y9GYuuMoUJ4RAny5AKCNQy0t5SY+sD0qwg5qpLfK9/jhmgCeLyDC 0Wf5PDIkwM8GDUZY0Aa0cmM= =z/qB -----END PGP SIGNATURE----- _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
