... order) 6 11 01 9 11 11 12 010 1 18 011 1 24 10 01 36 10 11 48 00 01 10 .3 802. 11 b: HR/DSSS PHY When the initial version of 802. 11 was ratified in 19 97, the real work was only just beginning. The ... channels. 10 .2 .1. 2 Encoding in 802. 11 direct-sequence networks 802. 11 uses the Barker sequence { +1, -1, +1, +1, -1, +1, +1, +1, -1, -1, -1} . As used in 802. 11 , +1 becomes 1, and -1 becomes 0, so the ... In 19 99, the 802. 11 working group released its second extension to the basic 802. 11 specification. In keeping with the IEEE numbering convention, the second extension was labeled 802. 11 b. 802. 11 b...