Barker Modulation
In wireless communications, sequences are usually chosen for their spectral properties and for low cross correlation with other sequences likely to interfere. In the 802.11b standard, an 11-chip Barker sequence is used for the 1 and 2 Mbit/sec rates. The value of the autocorrelation function for the Barker sequence is 0 or ±1 at all offsets except zero, where it is +11. This makes for a more uniform spectrum, and better performance in the receivers.
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