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Complementary Code Keying (CCK) is a modulation technique used in wireless communication systems, particularly in the context of spread spectrum technologies like those used in Wi-Fi. It encodes data by using pairs of complementary codes, which helps improve resistance to interference and enhances signal robustness. CCK allows for higher data rates compared to traditional techniques like Direct Sequence Spread Spectrum (DSSS) while maintaining efficient bandwidth usage. This method is instrumental in achieving reliable communication in environments with varying signal conditions.

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