what is complementary code keying?

hi!
i am a college student and my instructors is asking me to have a report about complementary code keying. I try to research about it, but it is still not clear for me. Can you give me some ideas how this complementary code keying works?

Hi,this is prety much a very vast topic with alot of engineering technical definitions. But complementary code keying a.k.a CCK is a form of modulation scheme using carrier waves in wireless networks that are bound to the IEEE 802.11b standard. Its really a hard thing to explain coz i might need like a whole page to do it, so i suggest u check out Wikipedia's explanation - its quite detailed.[img][/img]