barker code

The Barker code, originally developed for radar applications, is a coding scheme for spread-spectrum technology( DSSS) in WLANs according to IEEE 802.11b and 802.11g.

Data bits encoded with Barker code

In this coding scheme, a bit sequence of 13 bits or less replaces a single bit of information. In the case of 802.11 WLANs, a bit sequence of 11 bits is used, with the normal bit sequence corresponding to digital 0 and digital 1 represented by the inverse bit sequence. The most visible feature of the Barker code is the insignificant peaks of the autocorrelation, which always consist of +1, 0 and -1.