Complementary Code Keying (CCK)
Definition - What does Complementary Code Keying (CCK) mean?
Techopedia explains Complementary Code Keying (CCK)
WLANs with the 802.11b standard specification use CCK to operate at either 5.5 Mbps or 11 Mbps in the radio frequency band at 2.4 GHz to 2.4835 GHz. WLANs following the 802.11g standard use CCK when running at 802.11b speeds and at 54 Mbps. These WLANs use a more sophisticated modulation scheme called orthogonal frequency division multiplexing.
Complementary codes were first introduced by Marcel Golay in 1961. These codes are sets of finite sequences of equal length, or pairs of complementary binary codes.