Complementary code keying (CCK) is a modulation method used in wireless local area networks (WLANs). CCK replaced the Barker Code in wireless digital networks in 1999 to achieve data rates higher than 2 Mbps, although this was at the expense of shorter range distances. The higher data rates are the result of a shorter chipping sequence in CCK, which is eight bits versus the 11 bits in Barker Code. This means that there is less spreading to obtain higher data rates, but the signal becomes more susceptible to narrowband interference, resulting in a shorter radio transmission range.
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